Determination of frequency response of MEMS microphone from sound field measurements using optical phase-shifting interferometry method

2020 ◽  
Vol 170 ◽  
pp. 107523
Author(s):  
Denny Hermawanto ◽  
Kenji Ishikawa ◽  
Kohei Yatabe ◽  
Yasuhiro Oikawa
Keyword(s):  
Frequency Response ◽  
Sound Field ◽  
Field Measurements ◽  
Phase Shifting ◽  
Optical Phase ◽  
Phase Shifting Interferometry ◽  
Mems Microphone ◽  
Interferometry Method

Determination of Phase Shift by Digital Holography

2019 ◽  
Vol 888 ◽  
pp. 43-46
Author(s):  
Yoshitaka Takahashi ◽  
Masatoshi Saito ◽  
Toru Nakajima ◽  
Masakazu Shingu
Keyword(s):  
Phase Shift ◽  
Noise Reduction ◽  
Digital Holography ◽  
High Accuracy ◽  
Measured Data ◽  
Phase Shifting ◽  
Surface Shape ◽  
Shape Measurement ◽  
Phase Shifting Interferometry

In phase shifting interferometry phase shift is applied by various ways, but applying it with high accuracy, especially by LD current modulation, is not easy. In order to determine the accurate phase shift a new method has been proposed that the value of LD current corresponding to π/2 phase shift can be determined by phase shifting digital holography. The measured data of standard in surface shape measurement were used for calibration, and the obtained value was confirmed to cause noise reduction and improvement of holographic reconstructed images in digital holography.

Anti-Disturbance Phase-Shifting Interferometry Method Time-and-Frequency-Domain

2011 ◽  
Vol 31 (11) ◽  
pp. 1112005
Author(s):  
王明 Wang Ming ◽  
郝群 Hao Qun ◽  
朱秋东 Zhu Qiudong ◽  
胡摇 Hu Yao
Keyword(s):  
Frequency Domain ◽  
Phase Shifting ◽  
Phase Shifting Interferometry ◽  
Interferometry Method

scholarly journals Determination of the receiving range of sound field measurements in cavitating media

2008 ◽  
Vol 15 (5) ◽  
pp. 846-852
Author(s):  
Christian Koch ◽  
Klaus-Vitold Jenderka
Keyword(s):  
Sound Field ◽  
Field Measurements

A 1/3 Octave-Band Noise Generator for Sound-Field Audiometric Measurements

1982 ◽  
Vol 47 (1) ◽  
pp. 84-88
Author(s):  
Richard Lippmann ◽  
Doug Adams
Keyword(s):  
Frequency Response ◽  
Low Cost ◽  
Sound Field ◽  
Field Measurements ◽  
Noise Generator ◽  
Center Frequency ◽  
Octave Band ◽  
Band Noise ◽  
Switch Capacitor ◽  
Band Filter

The design of a low-cost 1/3 octave-band noise generator is presented. This device produces 1/3 octave bands of noise with center frequencies from 100 to 10,000 Hz using a recently introduced switch-capacitor filter with a frequency response which is similar to that of the 1/2 octave filters in the GR 1925 multifilter. The spectrum level of the noise bands produce by this device falls at a rate of 60 dB/octave or more. The noise generator may be used with an audiometer for sound-field measurements in non-anechoic audiometric testing rooms or for earphone measurements. It may also be used as a 1/3 octave-band filter with a center frequency from 100 to 10,000 Hz or as an octave-band filter with a center frequency from 125 to 8000 Hz.

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