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Proceedings Paper

A Fibre-Optic Liquid Crystal Temperature Switch
Author(s): H. J. Coles; E. L. Bone; A. R. Bowdler; H. F. Gleeson
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Paper Abstract

In many liquid crystal systems there is a direct phase transition between an optically scattering smectic or chiral nematic mesophase and the clear isotropic phase. Such transitions are characteristically sharp and take place at well defined temperatures which may occur anywhere in the range -20°C to 200°C. It is this novel feature of liquid crystal systems which together with the attributes of low loss optical fibres forms the basis of an accurate optical temperature switch'. The properties of this device include remote passive sensing with a narrow switching differential which is safe in hazardous environments, and is free from EM and RF interference. In this paper we discuss the operation of the liquid crystal temperature switch in a number of device configurations (reflective or transmissive) together with the wide variety of applications.

Paper Details

Date Published: 21 September 1988
PDF: 7 pages
Proc. SPIE 0949, Fibre Optics '88, (21 September 1988); doi: 10.1117/12.947533
Show Author Affiliations
H. J. Coles, The University (United Kingdom)
E. L. Bone, The University (United Kingdom)
A. R. Bowdler, The University (United Kingdom)
H. F. Gleeson, The University (United Kingdom)

Published in SPIE Proceedings Vol. 0949:
Fibre Optics '88
Lionel R. Baker, Editor(s)

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