High Dynamic Dual Mode Fiber Transitometry

Georges Kotrotsios; Pierre Denervaud; Lucien Falco; Olivier Parriaux

doi:10.1117/12.949302

23 February 1989 High Dynamic Dual Mode Fiber Transitometry

Georges Kotrotsios, Pierre Denervaud, Lucien Falco, Olivier Parriaux

Proceedings Volume 1011, Fiber Optic Sensors III; (1989) https://doi.org/10.1117/12.949302
Event: 1988 International Congress on Optical Science and Engineering, 1988, Hamburg, Germany

Abstract

A high dynamic range, short response time distributed fiber sensor for control and surveyance applications is presented. It uses the differential mode delay between the LP01 and LP11 modes of a conventional singlemode communication fiber used at 800 nm wavelength. Baseband readout of the relative phase and amplitude delivers information on the location of an event and on the magnitude of the measurand activating a microbending transducer which couples the originally excited dominant mode to the LP11 mode. The spatial separation and focalisation of the two modes can be performed with a 40 dB isolation by means of a monolithic microoptic component acting on the evanescent fields. A dedicated vector voltmeter with 0.1° phase accuracy at 10 MHz provides a transitometry spatial resolution of the order of 10 meters.

Citation Download Citation

Georges Kotrotsios, Pierre Denervaud, Lucien Falco, and Olivier Parriaux "High Dynamic Dual Mode Fiber Transitometry", Proc. SPIE 1011, Fiber Optic Sensors III, (23 February 1989); https://doi.org/10.1117/12.949302

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