Authors: Zhu, Chu; Hieftje, Gary M.

Source: Applied Spectroscopy, Volume 43, Issue 8, Pages 1293-1501 (November/December 1989) , pp. 1333-1336(4)

Publisher: Society for Applied Spectroscopy

Abstract:

A new fiber-optic temperature sensor has been developed, based upon selective reflection from a cholesteric liquid crystal. The change of reflected-light intensity can be 40 times larger than background over a temperature range of only 0.4°C. For the demonstrated system, the temperature at which maximum reflection occurred was at 14.578°C, with a standard deviation of 0.026°C. The relative standard deviation of the peak reflected-light intensity was 7.1%. The dependence of the magnitude of reflection and that of peak temperature on the heating rate were studied. The response time of the present sensor is about 2 s, but it could be shortened with slight design modifications. Each sensor of the new type should be applicable to temperature sensing or control over a temperature range of about 1°C.

Keywords: Fiber-optic sensor; Liquid crystal; Temperature control and measurement

Document Type: Research article

DOI: http://dx.doi.org/10.1366/0003702894204128

Affiliations: 1: Department of Chemistry, Indiana University, Bloomington, Indiana 47405

Publication date: 1989-11-01

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