23 February 1989 High Dynamic Dual Mode Fiber Transitometry
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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
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.
© (1989) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Georges Kotrotsios, Georges Kotrotsios, Pierre Denervaud, Pierre Denervaud, Lucien Falco, Lucien Falco, Olivier Parriaux, Olivier Parriaux, "High Dynamic Dual Mode Fiber Transitometry", Proc. SPIE 1011, Fiber Optic Sensors III, (23 February 1989); doi: 10.1117/12.949302; https://doi.org/10.1117/12.949302

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