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Title: Measurement of a microphone membrane deflection profile using an optical fibre and wedge fringe projection
Authors: Tay, C.J. 
Quan, C. 
Wang, S.H. 
Shang, H.M. 
Chan, K.C.
Keywords: Fringe projection
Non-destruction testing
Optical fibre
Optical wedge
Phase-shifting technique
Issue Date: Mar-2001
Citation: Tay, C.J., Quan, C., Wang, S.H., Shang, H.M., Chan, K.C. (2001-03). Measurement of a microphone membrane deflection profile using an optical fibre and wedge fringe projection. Measurement Science and Technology 12 (3) : 320-326. ScholarBank@NUS Repository.
Abstract: A new technique for determining the deformation of the membrane in a microphone is described. Using an optical fibre and an optical wedge a sinusoidal fringe pattern with a pitch of the order of micrometres can be readily generated. Due to the laser interference in a perfect common path the proposed fringe projector is compact and the stable fringe pattern from the optical wedge can be projected onto the test surface. A four frame phase-shifting technique is employed for phase measurement. The phase shifting is carried out by translating the optical fibre mounted on a translation stage. The fringe pattern projected onto the test surface is captured by a CCD camera mounted on a long distance microscope. As demonstrated by the experimental results the proposed set-up is capable of measuring deformations of the membrane of the microphone to sub-micrometre levels.
Source Title: Measurement Science and Technology
ISSN: 09570233
DOI: 10.1088/0957-0233/12/3/311
Appears in Collections:Staff Publications

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