---
_id: '15360'
abstract:
- lang: eng
  text: 'One method to generate focused sound is to transmit amplitude modulated ultrasound
    of high energy in a nonlinear medium, so that sum and difference frequencies develop.
    Practically wide arrays of many small ultrasonic transducers are used, but the
    generation of very low frequencies is always weak. This contribution is about
    the experimental investigation of the {\textquotedbl}generation zone{\textquotedbl}
    -- that is the distance between the ultrasonic loudspeaker and the listener --
    and the decrease of the lower frequency bound of the audible sound beam with distance.
    The main focus is on the experimental setup, which permits the parametric sound
    generation with only one ultrasonic transducer and a waveguide. In addition, the
    new measurement setup enables to show an additional effect: The de-coherence of
    the primary ultrasound wave which may be caused by saturation of air. This is
    why the lower frequency bound decreases as well if we approach the ultrasonic
    transducer.'
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. Lower Frequency Bound of Parametric Arrays. In: ;
    2005.'
  apa: Rautenberg, J., & Henning, B. (2005). Lower Frequency Bound of Parametric
    Arrays. Presented at the Workshop on piezoelectric materials and applications
    in actuators, Paderborn.
  bibtex: '@inproceedings{Rautenberg_Henning_2005, title={Lower Frequency Bound of
    Parametric Arrays}, author={Rautenberg, Jens and Henning, Bernd}, year={2005}
    }'
  chicago: Rautenberg, Jens, and Bernd Henning. “Lower Frequency Bound of Parametric
    Arrays,” 2005.
  ieee: J. Rautenberg and B. Henning, “Lower Frequency Bound of Parametric Arrays,”
    presented at the Workshop on piezoelectric materials and applications in actuators,
    Paderborn, 2005.
  mla: Rautenberg, Jens, and Bernd Henning. <i>Lower Frequency Bound of Parametric
    Arrays</i>. 2005.
  short: 'J. Rautenberg, B. Henning, in: 2005.'
conference:
  end_date: 25.05.2005
  location: Paderborn
  name: Workshop on piezoelectric materials and applications in actuators
  start_date: 22.05.2005
date_created: 2019-12-17T15:51:33Z
date_updated: 2022-01-06T06:52:21Z
department:
- _id: '49'
language:
- iso: eng
status: public
title: Lower Frequency Bound of Parametric Arrays
type: conference
user_id: '15911'
year: '2005'
...