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Proceedings Paper

Amplitude multiplexing of Mach-Zehnder interferometer array and its application to locating acoustic emission
Author(s): Jianmin Gong; J. M. K. MacAlpine; Wei Jin; Yanbiao Liao
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Paper Abstract

We report an amplitude division multiplexed interferometric sensor array for locating acoustic emission. The interferometer is composed of 3 arms, the two sensing arms have different interference amplitude with the reference arm, so we can judge whether a sensor receives sound or not from the composite interference amplitude. For single sound source, the sound-receiving delay of two sensors can be obtained from the time when the interference amplitude changes, and the sound source location relative to the sensors can also be achieved in a 1-D system. Preliminary experiments were carried out and demonstrated a one-dimensional (1-D) location accuracy of better than 1cm. The system can be extended for 2-D and 3-D location of acoustic emissions by adding one or two more sensing arms, respectively, in the interferometer.

Paper Details

Date Published: 30 October 2001
PDF: 6 pages
Proc. SPIE 4596, Advanced Photonic Sensors and Applications II, (30 October 2001); doi: 10.1117/12.447365
Show Author Affiliations
Jianmin Gong, Tsinghua Univ. (Hong Kong)
J. M. K. MacAlpine, Hong Kong Polytechnic Univ. (Hong Kong)
Wei Jin, Hong Kong Polytechnic Univ. (Hong Kong)
Yanbiao Liao, Tsinghua Univ. (China)


Published in SPIE Proceedings Vol. 4596:
Advanced Photonic Sensors and Applications II

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