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Proceedings Paper

Determining quasistatic measurands without a receiving interferometer using a simple dual-wavelength technique
Author(s): Craig McGarrity; David A. Jackson
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Paper Abstract

A technique using dual-wavelength interferometry which permits the demodulation of quasi-static measurands from very short cavities is introduced. It requires the optical path difference of the sensor to be perturbed and a careful choice of the two wavelengths. Under these conditions comparable resolution and range to conventional dual- wavelength white-light interferometry is obtained. A remote receiving interferometer is not required. Experimental verification of this technique using a fiber Mach-Zehnder under conditions of natural drift are presented. A resolution of 0.2 nm (corresponding to 1.5 mrad at 827 nm) over an effective wavelength of 114.8 micrometer was achieved. Multiplexing using this demodulation technique is also presented. A network of eight sensors is demonstrated with the same resolution and range as the single Mach- Zehnder.

Paper Details

Date Published: 25 October 1996
PDF: 11 pages
Proc. SPIE 2839, Fiber Optic and Laser Sensors XIV, (25 October 1996); doi: 10.1117/12.255344
Show Author Affiliations
Craig McGarrity, Univ. of Kent at Canterbury (United Kingdom)
David A. Jackson, Univ. of Kent at Canterbury (United Kingdom)

Published in SPIE Proceedings Vol. 2839:
Fiber Optic and Laser Sensors XIV
Ramon P. DePaula; John W. Berthold III, Editor(s)

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