---
_id: '15339'
abstract:
- lang: eng
text: 'Continuous and reliable concentration measurement of liquids still is a great
challenge as the sensor systems have to meet high industrial requirements. Apart
from chemical sensors there are a couple of acoustic systems [1] that are well
suited for a lot of industrial applications. Most of them determine the amplitude
ratio of deflected ultrasound bursts at different boundaries as well as the sound
velocity of the liquid in order to calculate its acoustic impedance and therewith
its density. The advantages of acoustic sensors are their robustness and their
fast response. Their disadvantages are sensitivity against variations of the reference
material properties as well as abrasion or soiling of the boundaries. This contribution
is about a new model-based method that uses the whole surface of an acoustic waveguide
as reference boundary: It has turned out that the principal components of a signal
at the end of the waveguide can be assigned to the different propagative acoustic
modes (Fig. 1). Therefore it is necessary to use different simulation tools, e.g.
FEM and modal analysis (Fig. 2). With this it is possible to determine the amplitudes
of each mode by means of one measured signal at the end of the waveguide and Gauss
Algorithm even if the transducer is of very simple kind [2]. Therewith it is possible
to get redundant information -- one amplitude for each mode -- for the liquid
impedance. In addition to that it is possible to generate an acoustic reference
signal without information about the liquid impedance but dissipation if we use
the fundamental mode. The different signal amplitudes and a model of acoustic
wave propagation [2, 3] offer the possibility to distinguish between dissipation
in the liquid and attenuation due to the impedance relations. Moreover, if there
are enough analysable amplitudes available, variations of the reference material
properties can be determined.'
author:
- first_name: Jens
full_name: Rautenberg, Jens
last_name: Rautenberg
- first_name: Bernd
full_name: Henning, Bernd
id: '213'
last_name: Henning
citation:
ama: 'Rautenberg J, Henning B. New approach for the reliable measurement of acoustic
impedance of liquids in an acoustic waveguide. In: Vol II. ; 2007:87-92.'
apa: Rautenberg, J., & Henning, B. (2007). New approach for the reliable measurement
of acoustic impedance of liquids in an acoustic waveguide (Vol. II, pp. 87–92).
Presented at the 13th International Conference Sensor + Test 2007, Nürnberg.
bibtex: '@inproceedings{Rautenberg_Henning_2007, title={New approach for the reliable
measurement of acoustic impedance of liquids in an acoustic waveguide}, volume={II},
author={Rautenberg, Jens and Henning, Bernd}, year={2007}, pages={87–92} }'
chicago: Rautenberg, Jens, and Bernd Henning. “New Approach for the Reliable Measurement
of Acoustic Impedance of Liquids in an Acoustic Waveguide,” II:87–92, 2007.
ieee: J. Rautenberg and B. Henning, “New approach for the reliable measurement of
acoustic impedance of liquids in an acoustic waveguide,” presented at the 13th
International Conference Sensor + Test 2007, Nürnberg, 2007, vol. II, pp. 87–92.
mla: Rautenberg, Jens, and Bernd Henning. New Approach for the Reliable Measurement
of Acoustic Impedance of Liquids in an Acoustic Waveguide. Vol. II, 2007,
pp. 87–92.
short: 'J. Rautenberg, B. Henning, in: 2007, pp. 87–92.'
conference:
end_date: 24.05.2007
location: Nürnberg
name: 13th International Conference Sensor + Test 2007
start_date: 22.05.2007
date_created: 2019-12-17T13:22:24Z
date_updated: 2022-01-06T06:52:20Z
department:
- _id: '49'
language:
- iso: eng
page: 87-92
publication_identifier:
isbn:
- 978-3-9810993-2-4
status: public
title: New approach for the reliable measurement of acoustic impedance of liquids
in an acoustic waveguide
type: conference
user_id: '15911'
volume: II
year: '2007'
...
---
_id: '15344'
abstract:
- lang: eng
text: In many applications ultrasonic transducers are used for transmitting and
receiving ultrasonic waves. Ultrasonic sensor systems meet the practical requirements
of industrial applications quite well. Typical sensor applications are for example
the measurement of distance and thickness. Especially if only one ultrasonic transceiver
and the well-known pulse-echo-method are used, the sensor electronics has to switch
from transmitting to receiving mode. This is one of the most limiting properties
because the probe can not receive echoes from nearby obstacles or thin material
layers. This contribution deals with the development of an electronic interface
circuit for ultrasonic sensors allowing transmitting and receiving of acoustic
signals simultaneously. There are already several methods to separate the transmitted
from the received signal for instance the well-known circulator in the telephone,
the differential transformer mentioned by Bradfield [1] or a directional coupler
[2]. The directional coupler consists of two broadband transformers linked with
each other in such a way that it equally distributes the input power at port one
to the third and fourth port, while port two is isolated. This circuit is also
known as 3 dB directional coupler and makes it possible to get reference echoes
directly from the interface between the sensor and the medium of interest. Several
reflectors or multiple sound paths such as used in ultrasonic density measurement
systems are unnecessary [3].
author:
- first_name: Torsten
full_name: Vössing, Torsten
last_name: Vössing
- first_name: Jens
full_name: Rautenberg, Jens
last_name: Rautenberg
- first_name: Romina
full_name: Kehl, Romina
last_name: Kehl
- first_name: Bernd
full_name: Henning, Bernd
id: '213'
last_name: Henning
citation:
ama: 'Vössing T, Rautenberg J, Kehl R, Henning B. Simultaneous transmitting and
receiving with ultrasonic sensors. In: ; 2007.'
apa: Vössing, T., Rautenberg, J., Kehl, R., & Henning, B. (2007). Simultaneous
transmitting and receiving with ultrasonic sensors. Presented at the 3th International
Conference Sensor + Test 2007, Nuremberg.
bibtex: '@inproceedings{Vössing_Rautenberg_Kehl_Henning_2007, title={Simultaneous
transmitting and receiving with ultrasonic sensors}, author={Vössing, Torsten
and Rautenberg, Jens and Kehl, Romina and Henning, Bernd}, year={2007} }'
chicago: Vössing, Torsten, Jens Rautenberg, Romina Kehl, and Bernd Henning. “Simultaneous
Transmitting and Receiving with Ultrasonic Sensors,” 2007.
ieee: T. Vössing, J. Rautenberg, R. Kehl, and B. Henning, “Simultaneous transmitting
and receiving with ultrasonic sensors,” presented at the 3th International Conference
Sensor + Test 2007, Nuremberg, 2007.
mla: Vössing, Torsten, et al. Simultaneous Transmitting and Receiving with Ultrasonic
Sensors. 2007.
short: 'T. Vössing, J. Rautenberg, R. Kehl, B. Henning, in: 2007.'
conference:
end_date: 24.05.2007
location: Nuremberg
name: 3th International Conference Sensor + Test 2007
start_date: 22.05.2007
date_created: 2019-12-17T14:22:24Z
date_updated: 2022-01-06T06:52:21Z
department:
- _id: '49'
language:
- iso: eng
publication_identifier:
isbn:
- 978-3-9810993-2-4
status: public
title: Simultaneous transmitting and receiving with ultrasonic sensors
type: conference
user_id: '15911'
year: '2007'
...