Fiber optic liquid crystal high-pressure sensor

Tomasz R. Wolinski; Wojtek J. Bock

doi:10.1117/12.46002

1 August 1991 Fiber optic liquid crystal high-pressure sensor

Tomasz R. Wolinski, Wojtek J. Bock

Proceedings Volume 1511, Fiber Optic Sensors: Engineering and Applications; (1991) https://doi.org/10.1117/12.46002
Event: ECO4 (The Hague '91), 1991, The Hague, Netherlands

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.

Citation Download Citation

Tomasz R. Wolinski and Wojtek J. Bock "Fiber optic liquid crystal high-pressure sensor", Proc. SPIE 1511, Fiber Optic Sensors: Engineering and Applications, (1 August 1991); https://doi.org/10.1117/12.46002

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