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Proceedings Paper

Fiber optic liquid crystal high-pressure sensor
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Paper Abstract

A new fiber-optic high hydrostatic pressure sensor up to 100 MPa based on extrinsic intensity modulation of light reflected from a cholesteric liquid crystal (ChLC) sensing element is proposed and demonstrated. The sensor exploits the effect of pressure-induced changes in the wavelength of maximum light reflection observed in ChLCs. Three different configurations of the sensor which utilizes multimode optical fibers for communication with the high-pressure region were investigated: a double-source configuration and two configurations with double sensing elements. Results obtained demonstrate that the proposed cost-effective fiber-optic liquid-crystal sensor has a pressure coefficient two orders of magnitude higher than current high-pressure sensors. Depending on the applied configuration, the sensor can display a good linear response and sensitivity for specific ranges of pressure useful in industrial applications.

Paper Details

Date Published: 1 August 1991
PDF: 8 pages
Proc. SPIE 1511, Fiber Optic Sensors: Engineering and Applications, (1 August 1991); doi: 10.1117/12.46002
Show Author Affiliations
Tomasz R. Wolinski, Univ. of Quebec/Hull (Canada)
Wojtek J. Bock, Univ. of Quebec/Hull (Canada)

Published in SPIE Proceedings Vol. 1511:
Fiber Optic Sensors: Engineering and Applications
Anastasius J.A. Bruinsma; Brian Culshaw, Editor(s)

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