Please use this identifier to cite or link to this item:
https://doi.org/10.1088/0957-0233/12/3/311
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 Microphone Non-destruction testing Optical fibre Optical wedge Phase-shifting technique |
Issue Date: | Mar-2001 |
Source: | 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. https://doi.org/10.1088/0957-0233/12/3/311 |
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 |
URI: | http://scholarbank.nus.edu.sg/handle/10635/60692 |
ISSN: | 09570233 |
DOI: | 10.1088/0957-0233/12/3/311 |
Appears in Collections: | Staff Publications |
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