Free-field reciprocity calibration of condenser microphones in the low ultrasonic frequency range

This thesis describes the development of a measurement set-up for the free-field calibration of 1/4-inch condenser microphones by the reciprocity method, and enables traceable measurements of the free-field sensitivity of condenser microphones in the low ultrasonic frequency range from 20 kHz to 160 kHz. A new, fully automated measurement set-up for free-field reciprocity calibration of 1/4-inch condenser microphones has been established, and a procedure for the calculation of the free-field sensitivity of 1/4-inch condenser microphones is described. The parameters influencing the measurements (acoustic and electric noise, crosstalk, distortion, measurement distance, standing waves and reflections, environmental conditions) were studied and optimized. Measurement results and their associated uncertainties are given in the ultrasonic frequency range from 20 kHz to 160 kHz in 1/3-Octave steps. The end of this thesis describes the use of a time selective technique permitting the identification of undesirable disturbances due to crosstalk, standing waves and reflections and the possibility of their elimination.

Level thesis:degree_level

thesis.doctoral

Grantor dc:publisher

Universität Oldenburg

Year

2007

Author dc:creator

• Bouaoua, Nourreddine

• [Keine Schlagwörter von Autor/in vergeben.]

Repository record source_url

http://oops.uni-oldenburg.de/725

OAI identifier oai:identifier

oai:oops.uni-oldenburg.de:725