Theoretical study on the phase sensitivity of condenser type acoustic transducers at low frequencies

Author:

Liu Aibing1,Liu Di1,Zhang Fan1ORCID,Wang Huiheng1,Wu Jixing1,Chen Feng2,Feng Xiujuan3

Affiliation:

1. School of Transportation and Vehicle Engineering, Shandong University of Technology, Zibo, China

2. Hangzhou Acoustic Sensing Technology Co, Ltd, Hangzhou, China

3. Division of Mechanics and Acoustics, National Institute of Metrology, Beijing, China

Abstract

The phase sensitivity of the condenser type acoustic transducers at low frequencies is crucial for locating large-scale natural and manmade activities, but is now commonly calibrated based on comparison methods. Although the primary method, which traces its sensitivity back to the international standard unit is few studied. Recently, the explicit sensitivity models of the condenser type acoustic transducers based on the laser-pistonphone technique are built, and can be used to study the phase responses of acoustic transducers at infrasonic frequencies. So that, in this paper, the phase sensitivities of acoustic transducers when its rear vent connected to the calibrating sound field or outside atmosphere are studied in detail. Secondly, time domain analysis of generated sound pressures by displacement excitation are derived to reveal the mechanism of phase variation. Calculations show two distinct sensitivities with 90° phase lead and −10° phase lag limits for vent in field and vent out field calibrations, which are dominated by the pressure leakage and heat conduction effects at infrasonic frequencies.

Funder

National Natural Science Foundation of China

Publisher

SAGE Publications

Subject

Mechanical Engineering,Geophysics,Mechanics of Materials,Acoustics and Ultrasonics,Building and Construction,Civil and Structural Engineering

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