---
_id: '59995'
abstract:
- lang: eng
  text: "<jats:title>Abstract</jats:title>\r\n               <jats:p>Ultrasonic transmission
    measurements can be used for material characterization, as the propagation time
    of sound waves and thus their velocity depends on the elastic material parameters.
    Measurement results for the elastic material parameters are acquired non-destructively
    using ultrasonic transmission measurements of hollow cylindrical polymer specimens.
    To determine the material parameters, an inverse approach is used comparing measurements
    with simulated data. Previous studies show that the procedure exhibits low sensitivity
    with respect to the shear parameters of the material. In order to increase the
    sensitivity, we propose to apply a spatially annular excitation on the base of
    the specimen. As a measure to analyse the sensitivities with respect to all parameters
    and their linear independence, we observe the volume of the parallelotope of the
    sensitivity vectors. Here, a scaled boundary finite element formulation of wave
    propagation in the specimen is expanded to yield derivative information directly,
    and a sensitivity analysis can be carried out efficiently. Finally, the results
    of this sensitivity analysis with regard to the annular excitation are also applied
    to the measurement setup.</jats:p>"
article_number: '6'
article_type: original
author:
- first_name: Dmitrij
  full_name: Dreiling, Dmitrij
  id: '32616'
  last_name: Dreiling
- first_name: Dominik
  full_name: Itner, Dominik
  last_name: Itner
- first_name: Hauke
  full_name: Gravenkamp, Hauke
  last_name: Gravenkamp
- first_name: Leander
  full_name: Claes, Leander
  id: '11829'
  last_name: Claes
  orcid: 0000-0002-4393-268X
- first_name: Carolin
  full_name: Birk, Carolin
  last_name: Birk
- first_name: Bernd
  full_name: Henning, Bernd
  id: '213'
  last_name: Henning
citation:
  ama: Dreiling D, Itner D, Gravenkamp H, Claes L, Birk C, Henning B. Increasing the
    sensitivity of ultrasonic transmission measurements for elastic material parameter
    estimation. <i>Measurement Science and Technology</i>. 2025;36. doi:<a href="https://doi.org/10.1088/1361-6501/add9b6">10.1088/1361-6501/add9b6</a>
  apa: Dreiling, D., Itner, D., Gravenkamp, H., Claes, L., Birk, C., &#38; Henning,
    B. (2025). Increasing the sensitivity of ultrasonic transmission measurements
    for elastic material parameter estimation. <i>Measurement Science and Technology</i>,
    <i>36</i>, Article 6. <a href="https://doi.org/10.1088/1361-6501/add9b6">https://doi.org/10.1088/1361-6501/add9b6</a>
  bibtex: '@article{Dreiling_Itner_Gravenkamp_Claes_Birk_Henning_2025, title={Increasing
    the sensitivity of ultrasonic transmission measurements for elastic material parameter
    estimation}, volume={36}, DOI={<a href="https://doi.org/10.1088/1361-6501/add9b6">10.1088/1361-6501/add9b6</a>},
    number={6}, journal={Measurement Science and Technology}, publisher={IOP Publishing},
    author={Dreiling, Dmitrij and Itner, Dominik and Gravenkamp, Hauke and Claes,
    Leander and Birk, Carolin and Henning, Bernd}, year={2025} }'
  chicago: Dreiling, Dmitrij, Dominik Itner, Hauke Gravenkamp, Leander Claes, Carolin
    Birk, and Bernd Henning. “Increasing the Sensitivity of Ultrasonic Transmission
    Measurements for Elastic Material Parameter Estimation.” <i>Measurement Science
    and Technology</i> 36 (2025). <a href="https://doi.org/10.1088/1361-6501/add9b6">https://doi.org/10.1088/1361-6501/add9b6</a>.
  ieee: 'D. Dreiling, D. Itner, H. Gravenkamp, L. Claes, C. Birk, and B. Henning,
    “Increasing the sensitivity of ultrasonic transmission measurements for elastic
    material parameter estimation,” <i>Measurement Science and Technology</i>, vol.
    36, Art. no. 6, 2025, doi: <a href="https://doi.org/10.1088/1361-6501/add9b6">10.1088/1361-6501/add9b6</a>.'
  mla: Dreiling, Dmitrij, et al. “Increasing the Sensitivity of Ultrasonic Transmission
    Measurements for Elastic Material Parameter Estimation.” <i>Measurement Science
    and Technology</i>, vol. 36, 6, IOP Publishing, 2025, doi:<a href="https://doi.org/10.1088/1361-6501/add9b6">10.1088/1361-6501/add9b6</a>.
  short: D. Dreiling, D. Itner, H. Gravenkamp, L. Claes, C. Birk, B. Henning, Measurement
    Science and Technology 36 (2025).
date_created: 2025-05-19T13:30:39Z
date_updated: 2025-05-27T15:03:38Z
department:
- _id: '49'
doi: 10.1088/1361-6501/add9b6
funded_apc: '1'
intvolume: '        36'
keyword:
- Sensitivity analysis
- Ultrasonic transducer
- Guided waves
- Polymers
- Gram determinant
language:
- iso: eng
main_file_link:
- open_access: '1'
  url: https://iopscience.iop.org/article/10.1088/1361-6501/add9b6
oa: '1'
project:
- _id: '89'
  grant_number: '409779252'
  name: 'VaMP: Vollständige Bestimmung der akustischen Materialparameter von Polymeren'
publication: Measurement Science and Technology
publication_identifier:
  issn:
  - 0957-0233
  - 1361-6501
publication_status: published
publisher: IOP Publishing
quality_controlled: '1'
status: public
title: Increasing the sensitivity of ultrasonic transmission measurements for elastic
  material parameter estimation
type: journal_article
user_id: '32616'
volume: 36
year: '2025'
...
---
_id: '61825'
abstract:
- lang: eng
  text: "<jats:title>Abstract</jats:title>\r\n               <jats:p>Industrial x-ray
    computed tomography (CT) systems with high geometric flexibility are increasingly
    utilized for large-scale measurement objects or challenging measurement tasks.
    To maintain high accuracy when deviating from the established circular scan trajectory,
    trajectory calibration methods using multi-sphere reference objects with known
    marker positions are commonly employed. These multi-sphere objects can either
    be scanned together with the measurement object (online trajectory calibration)
    or in a separate scan (offline trajectory calibration). While offline calibration
    increases machine time, it generally results in higher scan quality. However,
    a sufficient pose repeatability is necessary to ensure comparable or even superior
    accuracy to online calibration. In this contribution, we present a straightforward
    procedure to compare both types of trajectory calibration in a way that the differences
    of the results can directly be traced back to the influence of the pose repeatability.
    The multi-sphere reference object is not only used for trajectory calibration,
    but simultaneously as a measurement object for repeated measurements. The methodology
    is tested on both a twin robotic CT system and a conventional CT system that is
    additionally equipped with a hexapod manipulator for adaptive object tilting.
    Results showed, independent from the type of trajectory calibration, systematic
    measurement errors in the order of 10<jats:sup>−5</jats:sup>–10<jats:sup>−4</jats:sup>
    of measured sphere distances and sphericity values below 50 <jats:inline-formula>\r\n
    \                    <jats:tex-math/>\r\n                     <mml:math xmlns:mml=\"http://www.w3.org/1998/Math/MathML\"
    overflow=\"scroll\">\r\n                        <mml:mrow>\r\n                           <mml:mrow>\r\n
    \                             <mml:mtext>μ</mml:mtext>\r\n                           </mml:mrow>\r\n
    \                          <mml:mrow>\r\n                              <mml:mi
    mathvariant=\"normal\">m</mml:mi>\r\n                           </mml:mrow>\r\n
    \                       </mml:mrow>\r\n                     </mml:math>\r\n                  </jats:inline-formula>.
    For sphere distances, random errors were increased by a factor of 5 due to the
    offline trajectory calibration, but were still low (<jats:inline-formula>\r\n
    \                    <jats:tex-math/>\r\n                     <mml:math xmlns:mml=\"http://www.w3.org/1998/Math/MathML\"
    overflow=\"scroll\">\r\n                        <mml:mrow>\r\n                           <mml:mrow>\r\n
    \                             <mml:mo>&lt;</mml:mo>\r\n                           </mml:mrow>\r\n
    \                          <mml:mrow>\r\n                              <mml:mn>1</mml:mn>\r\n
    \                          </mml:mrow>\r\n                           <mml:mstyle
    scriptlevel=\"0\"/>\r\n                           <mml:mrow>\r\n                              <mml:mtext>μ</mml:mtext>\r\n
    \                          </mml:mrow>\r\n                           <mml:mrow>\r\n
    \                             <mml:mi mathvariant=\"normal\">m</mml:mi>\r\n                           </mml:mrow>\r\n
    \                       </mml:mrow>\r\n                     </mml:math>\r\n                  </jats:inline-formula>)
    in comparison to systematic errors and the spread of different measurement features.
    Overall, both investigated systems demonstrated sufficient positioning repeatability
    for offline trajectory calibration. The method is in general also applicable to
    any other types of manipulator systems used for CT devices. It provides a workflow
    for the decision which type of trajectory calibration is preferable for a given
    CT system.</jats:p>"
article_number: '025401'
author:
- first_name: Lorenz
  full_name: Butzhammer, Lorenz
  last_name: Butzhammer
- first_name: Niklas
  full_name: Handke, Niklas
  last_name: Handke
- first_name: Simon
  full_name: Wittl, Simon
  last_name: Wittl
- first_name: Gabriel
  full_name: Herl, Gabriel
  last_name: Herl
- first_name: Tino
  full_name: Hausotte, Tino
  last_name: Hausotte
citation:
  ama: Butzhammer L, Handke N, Wittl S, Herl G, Hausotte T. Direct assessment of the
    influence of pose repeatability on the accuracy of dimensional measurements for
    computed tomography systems with high degrees of freedom. <i>Measurement Science
    and Technology</i>. 2025;36(2). doi:<a href="https://doi.org/10.1088/1361-6501/ada05a">10.1088/1361-6501/ada05a</a>
  apa: Butzhammer, L., Handke, N., Wittl, S., Herl, G., &#38; Hausotte, T. (2025).
    Direct assessment of the influence of pose repeatability on the accuracy of dimensional
    measurements for computed tomography systems with high degrees of freedom. <i>Measurement
    Science and Technology</i>, <i>36</i>(2), Article 025401. <a href="https://doi.org/10.1088/1361-6501/ada05a">https://doi.org/10.1088/1361-6501/ada05a</a>
  bibtex: '@article{Butzhammer_Handke_Wittl_Herl_Hausotte_2025, title={Direct assessment
    of the influence of pose repeatability on the accuracy of dimensional measurements
    for computed tomography systems with high degrees of freedom}, volume={36}, DOI={<a
    href="https://doi.org/10.1088/1361-6501/ada05a">10.1088/1361-6501/ada05a</a>},
    number={2025401}, journal={Measurement Science and Technology}, publisher={IOP
    Publishing}, author={Butzhammer, Lorenz and Handke, Niklas and Wittl, Simon and
    Herl, Gabriel and Hausotte, Tino}, year={2025} }'
  chicago: Butzhammer, Lorenz, Niklas Handke, Simon Wittl, Gabriel Herl, and Tino
    Hausotte. “Direct Assessment of the Influence of Pose Repeatability on the Accuracy
    of Dimensional Measurements for Computed Tomography Systems with High Degrees
    of Freedom.” <i>Measurement Science and Technology</i> 36, no. 2 (2025). <a href="https://doi.org/10.1088/1361-6501/ada05a">https://doi.org/10.1088/1361-6501/ada05a</a>.
  ieee: 'L. Butzhammer, N. Handke, S. Wittl, G. Herl, and T. Hausotte, “Direct assessment
    of the influence of pose repeatability on the accuracy of dimensional measurements
    for computed tomography systems with high degrees of freedom,” <i>Measurement
    Science and Technology</i>, vol. 36, no. 2, Art. no. 025401, 2025, doi: <a href="https://doi.org/10.1088/1361-6501/ada05a">10.1088/1361-6501/ada05a</a>.'
  mla: Butzhammer, Lorenz, et al. “Direct Assessment of the Influence of Pose Repeatability
    on the Accuracy of Dimensional Measurements for Computed Tomography Systems with
    High Degrees of Freedom.” <i>Measurement Science and Technology</i>, vol. 36,
    no. 2, 025401, IOP Publishing, 2025, doi:<a href="https://doi.org/10.1088/1361-6501/ada05a">10.1088/1361-6501/ada05a</a>.
  short: L. Butzhammer, N. Handke, S. Wittl, G. Herl, T. Hausotte, Measurement Science
    and Technology 36 (2025).
date_created: 2025-10-14T13:50:32Z
date_updated: 2026-02-12T10:45:36Z
department:
- _id: '630'
doi: 10.1088/1361-6501/ada05a
intvolume: '        36'
issue: '2'
language:
- iso: eng
main_file_link:
- open_access: '1'
  url: https://iopscience.iop.org/article/10.1088/1361-6501/ada05a/pdf
oa: '1'
project:
- _id: '130'
  name: 'TRR 285:  Methodenentwicklung zur mechanischen Fügbarkeit in wandlungsfähigen
    Prozessketten'
- _id: '133'
  name: TRR 285 - Project Area C
- _id: '149'
  name: TRR 285 - Subproject C05
publication: Measurement Science and Technology
publication_identifier:
  issn:
  - 0957-0233
  - 1361-6501
publication_status: published
publisher: IOP Publishing
quality_controlled: '1'
status: public
title: Direct assessment of the influence of pose repeatability on the accuracy of
  dimensional measurements for computed tomography systems with high degrees of freedom
type: journal_article
user_id: '93720'
volume: 36
year: '2025'
...
---
_id: '61788'
abstract:
- lang: eng
  text: "<jats:title>Abstract</jats:title>\r\n               <jats:p>Industrial x-ray
    computed tomography (CT) systems with high geometric flexibility are increasingly
    utilized for large-scale measurement objects or challenging measurement tasks.
    To maintain high accuracy when deviating from the established circular scan trajectory,
    trajectory calibration methods using multi-sphere reference objects with known
    marker positions are commonly employed. These multi-sphere objects can either
    be scanned together with the measurement object (online trajectory calibration)
    or in a separate scan (offline trajectory calibration). While offline calibration
    increases machine time, it generally results in higher scan quality. However,
    a sufficient pose repeatability is necessary to ensure comparable or even superior
    accuracy to online calibration. In this contribution, we present a straightforward
    procedure to compare both types of trajectory calibration in a way that the differences
    of the results can directly be traced back to the influence of the pose repeatability.
    The multi-sphere reference object is not only used for trajectory calibration,
    but simultaneously as a measurement object for repeated measurements. The methodology
    is tested on both a twin robotic CT system and a conventional CT system that is
    additionally equipped with a hexapod manipulator for adaptive object tilting.
    Results showed, independent from the type of trajectory calibration, systematic
    measurement errors in the order of 10<jats:sup>−5</jats:sup>–10<jats:sup>−4</jats:sup>
    of measured sphere distances and sphericity values below 50 <jats:inline-formula>\r\n
    \                    <jats:tex-math/>\r\n                     <mml:math xmlns:mml=\"http://www.w3.org/1998/Math/MathML\"
    overflow=\"scroll\">\r\n                        <mml:mrow>\r\n                           <mml:mrow>\r\n
    \                             <mml:mtext>μ</mml:mtext>\r\n                           </mml:mrow>\r\n
    \                          <mml:mrow>\r\n                              <mml:mi
    mathvariant=\"normal\">m</mml:mi>\r\n                           </mml:mrow>\r\n
    \                       </mml:mrow>\r\n                     </mml:math>\r\n                  </jats:inline-formula>.
    For sphere distances, random errors were increased by a factor of 5 due to the
    offline trajectory calibration, but were still low (<jats:inline-formula>\r\n
    \                    <jats:tex-math/>\r\n                     <mml:math xmlns:mml=\"http://www.w3.org/1998/Math/MathML\"
    overflow=\"scroll\">\r\n                        <mml:mrow>\r\n                           <mml:mrow>\r\n
    \                             <mml:mo>&lt;</mml:mo>\r\n                           </mml:mrow>\r\n
    \                          <mml:mrow>\r\n                              <mml:mn>1</mml:mn>\r\n
    \                          </mml:mrow>\r\n                           <mml:mstyle
    scriptlevel=\"0\"/>\r\n                           <mml:mrow>\r\n                              <mml:mtext>μ</mml:mtext>\r\n
    \                          </mml:mrow>\r\n                           <mml:mrow>\r\n
    \                             <mml:mi mathvariant=\"normal\">m</mml:mi>\r\n                           </mml:mrow>\r\n
    \                       </mml:mrow>\r\n                     </mml:math>\r\n                  </jats:inline-formula>)
    in comparison to systematic errors and the spread of different measurement features.
    Overall, both investigated systems demonstrated sufficient positioning repeatability
    for offline trajectory calibration. The method is in general also applicable to
    any other types of manipulator systems used for CT devices. It provides a workflow
    for the decision which type of trajectory calibration is preferable for a given
    CT system.</jats:p>"
article_number: '025401'
author:
- first_name: Lorenz
  full_name: Butzhammer, Lorenz
  last_name: Butzhammer
- first_name: Niklas
  full_name: Handke, Niklas
  last_name: Handke
- first_name: Simon
  full_name: Wittl, Simon
  last_name: Wittl
- first_name: Gabriel
  full_name: Herl, Gabriel
  last_name: Herl
- first_name: Tino
  full_name: Hausotte, Tino
  last_name: Hausotte
citation:
  ama: Butzhammer L, Handke N, Wittl S, Herl G, Hausotte T. Direct assessment of the
    influence of pose repeatability on the accuracy of dimensional measurements for
    computed tomography systems with high degrees of freedom. <i>Measurement Science
    and Technology</i>. 2024;36(2). doi:<a href="https://doi.org/10.1088/1361-6501/ada05a">10.1088/1361-6501/ada05a</a>
  apa: Butzhammer, L., Handke, N., Wittl, S., Herl, G., &#38; Hausotte, T. (2024).
    Direct assessment of the influence of pose repeatability on the accuracy of dimensional
    measurements for computed tomography systems with high degrees of freedom. <i>Measurement
    Science and Technology</i>, <i>36</i>(2), Article 025401. <a href="https://doi.org/10.1088/1361-6501/ada05a">https://doi.org/10.1088/1361-6501/ada05a</a>
  bibtex: '@article{Butzhammer_Handke_Wittl_Herl_Hausotte_2024, title={Direct assessment
    of the influence of pose repeatability on the accuracy of dimensional measurements
    for computed tomography systems with high degrees of freedom}, volume={36}, DOI={<a
    href="https://doi.org/10.1088/1361-6501/ada05a">10.1088/1361-6501/ada05a</a>},
    number={2025401}, journal={Measurement Science and Technology}, publisher={IOP
    Publishing}, author={Butzhammer, Lorenz and Handke, Niklas and Wittl, Simon and
    Herl, Gabriel and Hausotte, Tino}, year={2024} }'
  chicago: Butzhammer, Lorenz, Niklas Handke, Simon Wittl, Gabriel Herl, and Tino
    Hausotte. “Direct Assessment of the Influence of Pose Repeatability on the Accuracy
    of Dimensional Measurements for Computed Tomography Systems with High Degrees
    of Freedom.” <i>Measurement Science and Technology</i> 36, no. 2 (2024). <a href="https://doi.org/10.1088/1361-6501/ada05a">https://doi.org/10.1088/1361-6501/ada05a</a>.
  ieee: 'L. Butzhammer, N. Handke, S. Wittl, G. Herl, and T. Hausotte, “Direct assessment
    of the influence of pose repeatability on the accuracy of dimensional measurements
    for computed tomography systems with high degrees of freedom,” <i>Measurement
    Science and Technology</i>, vol. 36, no. 2, Art. no. 025401, 2024, doi: <a href="https://doi.org/10.1088/1361-6501/ada05a">10.1088/1361-6501/ada05a</a>.'
  mla: Butzhammer, Lorenz, et al. “Direct Assessment of the Influence of Pose Repeatability
    on the Accuracy of Dimensional Measurements for Computed Tomography Systems with
    High Degrees of Freedom.” <i>Measurement Science and Technology</i>, vol. 36,
    no. 2, 025401, IOP Publishing, 2024, doi:<a href="https://doi.org/10.1088/1361-6501/ada05a">10.1088/1361-6501/ada05a</a>.
  short: L. Butzhammer, N. Handke, S. Wittl, G. Herl, T. Hausotte, Measurement Science
    and Technology 36 (2024).
date_created: 2025-10-11T07:56:47Z
date_updated: 2025-10-11T08:00:02Z
doi: 10.1088/1361-6501/ada05a
intvolume: '        36'
issue: '2'
language:
- iso: eng
publication: Measurement Science and Technology
publication_identifier:
  issn:
  - 0957-0233
  - 1361-6501
publication_status: published
publisher: IOP Publishing
status: public
title: Direct assessment of the influence of pose repeatability on the accuracy of
  dimensional measurements for computed tomography systems with high degrees of freedom
type: journal_article
user_id: '107107'
volume: 36
year: '2024'
...
---
_id: '34264'
abstract:
- lang: eng
  text: In industrial x-ray computed tomography (CT), the application of more complex
    scan paths in comparison to the typical circular trajectory (${360}^{\circ}$ rotation
    of the measurement object) can extend the potential of CT. One way to enable such
    3D scan trajectories is to use a 6-degrees-of-freedom (DOF) object manipulator
    system. In our case, a hexapod is mounted on top of the rotary table of a commercial
    CT scanner. This allows for adaptive tilting of the measurement object during
    the scan. For high accuracy, the geometry calibration of such setups is typically
    done using the x-ray projections of a calibrated multi-sphere object. Contrary
    to this, here, we demonstrate a procedure that is based on only a single sphere
    and can therefore experimentally be implemented with low effort. Using the intrinsic
    geometry parameters of the CT device as prior information, the hexapod coordinate
    system with respect to the CT machine coordinate system is determined by means
    of a one-step optimization approach. The resulting parameters are used to calculate
    projection matrices that enable the volume reconstruction for 3D scan trajectories.
    The method is validated using simulated x-ray images and experimental investigations
    including dimensional measurements. For the used setup, geometric measurement
    results for 3D scan trajectories that are calibrated with the presented method
    show in sum increased errors compared to the circular scans. A limited pose accuracy
    of the manipulator system is discussed as a potential cause. The results nevertheless
    indicate that the presented method is generally feasible for dimensional CT measurements
    provided that the pose accuracy is sufficient. The calibration procedure can therefore
    be a low-cost and easier to implement alternative compared to trajectory calibration
    methods based on multi-sphere objects, but with a tendency towards lower measurement
    accuracy. The methodology can in principle be transferred to different setups
    with 6-DOF manipulator systems, e.g. C-arm CT devices with a robot arm.
article_number: '015403'
author:
- first_name: Lorenz
  full_name: Butzhammer, Lorenz
  last_name: Butzhammer
- first_name: Andreas Michael
  full_name: Müller, Andreas Michael
  last_name: Müller
- first_name: Tino
  full_name: Hausotte, Tino
  last_name: Hausotte
citation:
  ama: Butzhammer L, Müller AM, Hausotte T. Calibration of 3D scan trajectories for
    an industrial computed tomography setup with 6-DOF object manipulator system using
    a single sphere. <i>Measurement Science and Technology</i>. 2022;34(1). doi:<a
    href="https://doi.org/10.1088/1361-6501/ac9856">10.1088/1361-6501/ac9856</a>
  apa: Butzhammer, L., Müller, A. M., &#38; Hausotte, T. (2022). Calibration of 3D
    scan trajectories for an industrial computed tomography setup with 6-DOF object
    manipulator system using a single sphere. <i>Measurement Science and Technology</i>,
    <i>34</i>(1), Article 015403. <a href="https://doi.org/10.1088/1361-6501/ac9856">https://doi.org/10.1088/1361-6501/ac9856</a>
  bibtex: '@article{Butzhammer_Müller_Hausotte_2022, title={Calibration of 3D scan
    trajectories for an industrial computed tomography setup with 6-DOF object manipulator
    system using a single sphere}, volume={34}, DOI={<a href="https://doi.org/10.1088/1361-6501/ac9856">10.1088/1361-6501/ac9856</a>},
    number={1015403}, journal={Measurement Science and Technology}, publisher={IOP
    Publishing}, author={Butzhammer, Lorenz and Müller, Andreas Michael and Hausotte,
    Tino}, year={2022} }'
  chicago: Butzhammer, Lorenz, Andreas Michael Müller, and Tino Hausotte. “Calibration
    of 3D Scan Trajectories for an Industrial Computed Tomography Setup with 6-DOF
    Object Manipulator System Using a Single Sphere.” <i>Measurement Science and Technology</i>
    34, no. 1 (2022). <a href="https://doi.org/10.1088/1361-6501/ac9856">https://doi.org/10.1088/1361-6501/ac9856</a>.
  ieee: 'L. Butzhammer, A. M. Müller, and T. Hausotte, “Calibration of 3D scan trajectories
    for an industrial computed tomography setup with 6-DOF object manipulator system
    using a single sphere,” <i>Measurement Science and Technology</i>, vol. 34, no.
    1, Art. no. 015403, 2022, doi: <a href="https://doi.org/10.1088/1361-6501/ac9856">10.1088/1361-6501/ac9856</a>.'
  mla: Butzhammer, Lorenz, et al. “Calibration of 3D Scan Trajectories for an Industrial
    Computed Tomography Setup with 6-DOF Object Manipulator System Using a Single
    Sphere.” <i>Measurement Science and Technology</i>, vol. 34, no. 1, 015403, IOP
    Publishing, 2022, doi:<a href="https://doi.org/10.1088/1361-6501/ac9856">10.1088/1361-6501/ac9856</a>.
  short: L. Butzhammer, A.M. Müller, T. Hausotte, Measurement Science and Technology
    34 (2022).
date_created: 2022-12-07T10:46:14Z
date_updated: 2023-01-13T14:34:31Z
department:
- _id: '630'
doi: 10.1088/1361-6501/ac9856
intvolume: '        34'
issue: '1'
keyword:
- Applied Mathematics
- Instrumentation
- Engineering (miscellaneous)
language:
- iso: eng
main_file_link:
- open_access: '1'
  url: https://iopscience.iop.org/article/10.1088/1361-6501/ac9856
oa: '1'
project:
- _id: '130'
  grant_number: '418701707'
  name: 'TRR 285: TRR 285'
- _id: '133'
  name: 'TRR 285 - C: TRR 285 - Project Area C'
- _id: '149'
  name: 'TRR 285 – C05: TRR 285 - Subproject C05'
publication: Measurement Science and Technology
publication_identifier:
  issn:
  - 0957-0233
  - 1361-6501
publication_status: published
publisher: IOP Publishing
status: public
title: Calibration of 3D scan trajectories for an industrial computed tomography setup
  with 6-DOF object manipulator system using a single sphere
type: journal_article
user_id: '7850'
volume: 34
year: '2022'
...
---
_id: '32489'
abstract:
- lang: eng
  text: |-
    <jats:title>Abstract</jats:title>
                   <jats:p>The stagnation point heat fluxes of methane/air flames impinging normal on a cylindrical surface were determined experimentally. Light induced phosphorescence from thermographic phosphors was used to investigate surface temperatures at the stagnation point from a nearly 1D laminar premixed flame burning against a water-cooled ceramic tube. The ceramic tube was coated with 1.1% chromium-doped alumina (ruby) at the impingement area and excited with a green light-emitting diode (LED) to measure the surface temperature. The flame temperature profiles were also measured with a thermocouple of type R (Pt/Pt  +  13% Rh). Effects on variations in cold gas velocity (0.1 m s<jats:sup>−1</jats:sup>–0.5 m s<jats:sup>−1</jats:sup>) relative to the flame speed, equivalence ratio (Ф  =  0.85–1.2), burner to impingement surface spacing (<jats:italic>H</jats:italic>/<jats:italic>d</jats:italic>  =  0.5–2) and surface curvature are reported. The stagnation point heat fluxes are strongly influenced by the flame stabilization mechanism, which changes from burner to wall stabilization, which also is seen from the measured flame temperature profiles. Increasing the cold gas velocity of the reactants leads to higher stagnation point heat fluxes. In addition, decreasing the distance between the burner and impingement surface increases the heat flux, with higher heat fluxes recorded for a tube compared to a flat plate.</jats:p>
article_number: '094003'
author:
- first_name: Peter Obara
  full_name: Oketch, Peter Obara
  last_name: Oketch
- first_name: Munko
  full_name: Gonchikzhapov, Munko
  last_name: Gonchikzhapov
- first_name: Ulf
  full_name: Bergmann, Ulf
  last_name: Bergmann
- first_name: Burak
  full_name: Atakan, Burak
  last_name: Atakan
citation:
  ama: Oketch PO, Gonchikzhapov M, Bergmann U, Atakan B. Thermographic phosphor heat
    flux measurements of laminar methane/air flame impinging on a cylindrical surface.
    <i>Measurement Science and Technology</i>. 2019;30(9). doi:<a href="https://doi.org/10.1088/1361-6501/ab217e">10.1088/1361-6501/ab217e</a>
  apa: Oketch, P. O., Gonchikzhapov, M., Bergmann, U., &#38; Atakan, B. (2019). Thermographic
    phosphor heat flux measurements of laminar methane/air flame impinging on a cylindrical
    surface. <i>Measurement Science and Technology</i>, <i>30</i>(9), Article 094003.
    <a href="https://doi.org/10.1088/1361-6501/ab217e">https://doi.org/10.1088/1361-6501/ab217e</a>
  bibtex: '@article{Oketch_Gonchikzhapov_Bergmann_Atakan_2019, title={Thermographic
    phosphor heat flux measurements of laminar methane/air flame impinging on a cylindrical
    surface}, volume={30}, DOI={<a href="https://doi.org/10.1088/1361-6501/ab217e">10.1088/1361-6501/ab217e</a>},
    number={9094003}, journal={Measurement Science and Technology}, publisher={IOP
    Publishing}, author={Oketch, Peter Obara and Gonchikzhapov, Munko and Bergmann,
    Ulf and Atakan, Burak}, year={2019} }'
  chicago: Oketch, Peter Obara, Munko Gonchikzhapov, Ulf Bergmann, and Burak Atakan.
    “Thermographic Phosphor Heat Flux Measurements of Laminar Methane/Air Flame Impinging
    on a Cylindrical Surface.” <i>Measurement Science and Technology</i> 30, no. 9
    (2019). <a href="https://doi.org/10.1088/1361-6501/ab217e">https://doi.org/10.1088/1361-6501/ab217e</a>.
  ieee: 'P. O. Oketch, M. Gonchikzhapov, U. Bergmann, and B. Atakan, “Thermographic
    phosphor heat flux measurements of laminar methane/air flame impinging on a cylindrical
    surface,” <i>Measurement Science and Technology</i>, vol. 30, no. 9, Art. no.
    094003, 2019, doi: <a href="https://doi.org/10.1088/1361-6501/ab217e">10.1088/1361-6501/ab217e</a>.'
  mla: Oketch, Peter Obara, et al. “Thermographic Phosphor Heat Flux Measurements
    of Laminar Methane/Air Flame Impinging on a Cylindrical Surface.” <i>Measurement
    Science and Technology</i>, vol. 30, no. 9, 094003, IOP Publishing, 2019, doi:<a
    href="https://doi.org/10.1088/1361-6501/ab217e">10.1088/1361-6501/ab217e</a>.
  short: P.O. Oketch, M. Gonchikzhapov, U. Bergmann, B. Atakan, Measurement Science
    and Technology 30 (2019).
date_created: 2022-08-02T10:21:24Z
date_updated: 2022-08-15T13:53:14Z
doi: 10.1088/1361-6501/ab217e
intvolume: '        30'
issue: '9'
keyword:
- Applied Mathematics
- Instrumentation
- Engineering (miscellaneous)
publication: Measurement Science and Technology
publication_identifier:
  issn:
  - 0957-0233
  - 1361-6501
publication_status: published
publisher: IOP Publishing
status: public
title: Thermographic phosphor heat flux measurements of laminar methane/air flame
  impinging on a cylindrical surface
type: journal_article
user_id: '94996'
volume: 30
year: '2019'
...
---
_id: '13893'
abstract:
- lang: eng
  text: In this contribution, we present an efficient approach for the transient and
    time-causal modeling of guided waves in viscoelastic cylindrical waveguides in
    the context of ultrasonic material characterization. We use the scaled boundary
    finite element method (SBFEM) for efficient computation of the phase velocity
    dispersion. Regarding the viscoelastic behavior of the materials under consideration,
    we propose a decomposition approach that considers the real-valued frequency dependence
    of the (visco-)elastic moduli and, separately, of their attenuation. The modal
    expansion approach is utilized to take the transmitting and receiving transducers
    into account and to propagate the excited waveguide modes through a waveguide
    of finite length. The effectiveness of the proposed simulation model is shown
    by comparison with a standard transient FEM simulation as well as simulation results
    based on the exact solution of the complex-valued viscoelastic guided wave problem.
    Two material models are discussed, namely the fractional Zener model and the anti-Zener
    model; we re-interpret the latter in terms of the Rayleigh damping model. Measurements
    are taken on a polypropylene sample and the proposed transient simulation model
    is used for inverse material characterization. The extracted material properties
    may then be used in computer-aided design of ultrasonic systems.
author:
- first_name: Fabian
  full_name: Bause, Fabian
  last_name: Bause
- first_name: Hauke
  full_name: Gravenkamp, Hauke
  last_name: Gravenkamp
- first_name: Jens
  full_name: Rautenberg, Jens
  last_name: Rautenberg
- first_name: Bernd
  full_name: Henning, Bernd
  last_name: Henning
citation:
  ama: Bause F, Gravenkamp H, Rautenberg J, Henning B. Transient modeling of ultrasonic
    guided waves in circular viscoelastic waveguides for inverse material characterization.
    <i>Measurement Science and Technology</i>. 2015;26(095602 (17pp)). doi:<a href="https://doi.org/10.1088/0957-0233/26/9/095602">10.1088/0957-0233/26/9/095602</a>
  apa: Bause, F., Gravenkamp, H., Rautenberg, J., &#38; Henning, B. (2015). Transient
    modeling of ultrasonic guided waves in circular viscoelastic waveguides for inverse
    material characterization. <i>Measurement Science and Technology</i>, <i>26</i>(095602
    (17pp)). <a href="https://doi.org/10.1088/0957-0233/26/9/095602">https://doi.org/10.1088/0957-0233/26/9/095602</a>
  bibtex: '@article{Bause_Gravenkamp_Rautenberg_Henning_2015, title={Transient modeling
    of ultrasonic guided waves in circular viscoelastic waveguides for inverse material
    characterization}, volume={26}, DOI={<a href="https://doi.org/10.1088/0957-0233/26/9/095602">10.1088/0957-0233/26/9/095602</a>},
    number={095602 (17pp)}, journal={Measurement Science and Technology}, author={Bause,
    Fabian and Gravenkamp, Hauke and Rautenberg, Jens and Henning, Bernd}, year={2015}
    }'
  chicago: Bause, Fabian, Hauke Gravenkamp, Jens Rautenberg, and Bernd Henning. “Transient
    Modeling of Ultrasonic Guided Waves in Circular Viscoelastic Waveguides for Inverse
    Material Characterization.” <i>Measurement Science and Technology</i> 26, no.
    095602 (17pp) (2015). <a href="https://doi.org/10.1088/0957-0233/26/9/095602">https://doi.org/10.1088/0957-0233/26/9/095602</a>.
  ieee: F. Bause, H. Gravenkamp, J. Rautenberg, and B. Henning, “Transient modeling
    of ultrasonic guided waves in circular viscoelastic waveguides for inverse material
    characterization,” <i>Measurement Science and Technology</i>, vol. 26, no. 095602
    (17pp), 2015.
  mla: Bause, Fabian, et al. “Transient Modeling of Ultrasonic Guided Waves in Circular
    Viscoelastic Waveguides for Inverse Material Characterization.” <i>Measurement
    Science and Technology</i>, vol. 26, no. 095602 (17pp), 2015, doi:<a href="https://doi.org/10.1088/0957-0233/26/9/095602">10.1088/0957-0233/26/9/095602</a>.
  short: F. Bause, H. Gravenkamp, J. Rautenberg, B. Henning, Measurement Science and
    Technology 26 (2015).
date_created: 2019-10-16T14:24:43Z
date_updated: 2022-01-06T06:51:46Z
department:
- _id: '49'
doi: 10.1088/0957-0233/26/9/095602
intvolume: '        26'
issue: 095602 (17pp)
keyword:
- viscoelasticity
- ultrasonics
- guided waves
- inverse problem
- scaled boundary finite element method
language:
- iso: eng
publication: Measurement Science and Technology
publication_identifier:
  issn:
  - 0957-0233
status: public
title: Transient modeling of ultrasonic guided waves in circular viscoelastic waveguides
  for inverse material characterization
type: journal_article
user_id: '15911'
volume: 26
year: '2015'
...
---
_id: '13894'
article_number: '095602'
author:
- first_name: Fabian
  full_name: Bause, Fabian
  last_name: Bause
- first_name: Hauke
  full_name: Gravenkamp, Hauke
  last_name: Gravenkamp
- first_name: Jens
  full_name: Rautenberg, Jens
  last_name: Rautenberg
- first_name: Bernd
  full_name: Henning, Bernd
  id: '213'
  last_name: Henning
citation:
  ama: Bause F, Gravenkamp H, Rautenberg J, Henning B. Transient modeling of ultrasonic
    guided waves in circular viscoelastic waveguides for inverse material characterization.
    <i>Measurement Science and Technology</i>. 2015. doi:<a href="https://doi.org/10.1088/0957-0233/26/9/095602">10.1088/0957-0233/26/9/095602</a>
  apa: Bause, F., Gravenkamp, H., Rautenberg, J., &#38; Henning, B. (2015). Transient
    modeling of ultrasonic guided waves in circular viscoelastic waveguides for inverse
    material characterization. <i>Measurement Science and Technology</i>. <a href="https://doi.org/10.1088/0957-0233/26/9/095602">https://doi.org/10.1088/0957-0233/26/9/095602</a>
  bibtex: '@article{Bause_Gravenkamp_Rautenberg_Henning_2015, title={Transient modeling
    of ultrasonic guided waves in circular viscoelastic waveguides for inverse material
    characterization}, DOI={<a href="https://doi.org/10.1088/0957-0233/26/9/095602">10.1088/0957-0233/26/9/095602</a>},
    number={095602}, journal={Measurement Science and Technology}, author={Bause,
    Fabian and Gravenkamp, Hauke and Rautenberg, Jens and Henning, Bernd}, year={2015}
    }'
  chicago: Bause, Fabian, Hauke Gravenkamp, Jens Rautenberg, and Bernd Henning. “Transient
    Modeling of Ultrasonic Guided Waves in Circular Viscoelastic Waveguides for Inverse
    Material Characterization.” <i>Measurement Science and Technology</i>, 2015. <a
    href="https://doi.org/10.1088/0957-0233/26/9/095602">https://doi.org/10.1088/0957-0233/26/9/095602</a>.
  ieee: F. Bause, H. Gravenkamp, J. Rautenberg, and B. Henning, “Transient modeling
    of ultrasonic guided waves in circular viscoelastic waveguides for inverse material
    characterization,” <i>Measurement Science and Technology</i>, 2015.
  mla: Bause, Fabian, et al. “Transient Modeling of Ultrasonic Guided Waves in Circular
    Viscoelastic Waveguides for Inverse Material Characterization.” <i>Measurement
    Science and Technology</i>, 095602, 2015, doi:<a href="https://doi.org/10.1088/0957-0233/26/9/095602">10.1088/0957-0233/26/9/095602</a>.
  short: F. Bause, H. Gravenkamp, J. Rautenberg, B. Henning, Measurement Science and
    Technology (2015).
date_created: 2019-10-16T14:26:53Z
date_updated: 2022-01-06T06:51:46Z
department:
- _id: '49'
doi: 10.1088/0957-0233/26/9/095602
language:
- iso: eng
publication: Measurement Science and Technology
publication_identifier:
  issn:
  - 0957-0233
  - 1361-6501
publication_status: published
status: public
title: Transient modeling of ultrasonic guided waves in circular viscoelastic waveguides
  for inverse material characterization
type: journal_article
user_id: '15911'
year: '2015'
...