Please use this identifier to cite or link to this item:
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

Show full item record
Files in This Item:
There are no files associated with this item.


checked on Dec 1, 2021


checked on Dec 1, 2021

Page view(s)

checked on Dec 2, 2021

Google ScholarTM



Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.