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Proceedings Paper

Multiplexed interferometric displacement sensing below the laser frequency noise limit
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Paper Abstract

The resolution of fiber optic interferometry sensors is often limited by frequency noise in the laser. For this reason, prestabilization techniques have been used to reduce laser frequency fluctuations and improve signal resolution. However, for multi-element systems this becomes cumbersome and difficult to implement. In this paper, we demonstrate the use of digitally-enhanced interferometry for the interrogation of a multi-element sensing system. Over 50 dB of cross-talk rejection was found, with displacement resolutions of ~ 100 pm. Furthermore, using this technique, sub-frequency noise displacement resolution was obtained without the need for high performance sensors.

Paper Details

Date Published: 19 May 2011
PDF: 4 pages
Proc. SPIE 7753, 21st International Conference on Optical Fiber Sensors, 7753A4 (19 May 2011); doi: 10.1117/12.899431
Show Author Affiliations
Timothy T.-Y. Lam, The Australian National Univ. (Australia)
Danielle M. R. Wuchenich, The Australian National Univ. (Australia)
Jong H. Chow, The Australian National Univ. (Australia)
David E. McClelland, The Australian National Univ. (Australia)
Daniel A Shaddock, The Australian National Univ. (Australia)

Published in SPIE Proceedings Vol. 7753:
21st International Conference on Optical Fiber Sensors
Jacques Albert; Wojtek J. Bock, Editor(s)

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