Applications of the extrinsic Fabry-Perot interferometer

Jonathan A. Greene; Tuan A. Tran; Kent A. Murphy; Michael F. Gunther; Russell G. May; Richard O. Claus

doi:10.1117/12.221697

25 September 1995 Applications of the extrinsic Fabry-Perot interferometer

Jonathan A. Greene, Tuan A. Tran, Kent A. Murphy, Michael F. Gunther, Russell G. May, Richard O. Claus

Proceedings Volume 2510, Fiber Optic and Laser Sensors XIII; (1995) https://doi.org/10.1117/12.221697
Event: European Symposium on Optics for Environmental and Public Safety, 1995, Munich, Germany

Abstract

We discuss two of the latest demonstrations of the extrinsic Fabry-Perot interferometer (EFPI) sensor, namely a novel silica fiber-based hydrogen sensor and a high-temperature, sapphire fiber-based displacement sensor for surface strain measurements at temperatures up to 2000 degrees C. To modify the EFPI sensor for the detection of hydrogen, the sensor is sputter coated with a 2 micrometers layer of palladium. Based on the signal-to-noise ratio of the sensor, a minimum detectable hydrogen concentration of 35 ppm has been obtained. For displacement measurements at temperatures above the melting point of silica, we discuss results using a sapphire fiber EFPI sensing head demodulated using white light scanning Michelson interferometer.

Citation Download Citation

Jonathan A. Greene, Tuan A. Tran, Kent A. Murphy, Michael F. Gunther, Russell G. May, and Richard O. Claus "Applications of the extrinsic Fabry-Perot interferometer", Proc. SPIE 2510, Fiber Optic and Laser Sensors XIII, (25 September 1995); https://doi.org/10.1117/12.221697

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