Determining quasistatic measurands without a receiving interferometer using a simple dual-wavelength technique

Craig McGarrity; David A. Jackson

doi:10.1117/12.255344

25 October 1996 Determining quasi-static measurands without a receiving interferometer using a simple dual-wavelength technique

Craig McGarrity, David A. Jackson

Author Affiliations +

Proceedings Volume 2839, Fiber Optic and Laser Sensors XIV; (1996) https://doi.org/10.1117/12.255344
Event: SPIE's 1996 International Symposium on Optical Science, Engineering, and Instrumentation, 1996, Denver, CO, United States

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.

Citation Download Citation

Craig McGarrity and David A. Jackson "Determining quasi-static measurands without a receiving interferometer using a simple dual-wavelength technique", Proc. SPIE 2839, Fiber Optic and Laser Sensors XIV, (25 October 1996); https://doi.org/10.1117/12.255344

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