Affiliation:
1. Department of Chemistry, Indiana University, Bloomington, Indiana 47405
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.
Subject
Spectroscopy,Instrumentation
Reference14 articles.
1. Snitzer E. N., Morey W. and Glen W. H, in Proceedings of the First International Conference on Optical Fiber Sensors (Institute of Electrical Engineers, London, 1983), p. 79.
2. Fibre-optic temperature sensor with wide temperature range characteristics
3. Phase sensitivity of polarization-maintaining optical fiber used as temperature sensor
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