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Proceedings Paper

Bimorphous Distributed Transducer For Temperature Threshold Sensor
Author(s): Lucien Falco; Patrick Debergh
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Paper Abstract

A number of distributed optical fiber temperature sensors are requested to be only activated where and when the temperature field gets near to, and exceeds a threshold value set to be the alarm value. The proposed system uses the microbending loss effect in a graded index multimode fiber with OTDR readout. The transducing mechanism is based on a continuous bimorphous metal coating that is periodically and partially weakend so that temperature increase induces a microbending at the prescribed modal beat period. The pair of metals, as well as the coating process must be selected in order to place the maximum sensitivity in the neighbourhood of the alarm temperature. The sensitivity can be adjusted to the space-time fea-tures of the events to be detected, eg, semi-local hot spots or a heat source diffusing in an unbounded volume.

Paper Details

Date Published: 23 February 1989
PDF: 7 pages
Proc. SPIE 1011, Fiber Optic Sensors III, (23 February 1989); doi: 10.1117/12.949310
Show Author Affiliations
Lucien Falco, Centre Suisse d'Electronique et de Microtechnique S.A. (Switzerland)
Patrick Debergh, Centre Suisse d'Electronique et de Microtechnique S.A. (Switzerland)


Published in SPIE Proceedings Vol. 1011:
Fiber Optic Sensors III
Ralf Th. Kersten, Editor(s)

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