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Proceedings Paper

Optical low-cost temperature point sensor
Author(s): Christian Helmig; Joerg Teunissen
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Paper Abstract

In the area of high-voltage apparatus only the use of optical sensors offers the possibility to watch important measurands, e.g. current, voltage, partial discharge and temperature, in regions of high electric or magnetic fields. Among other concepts optical point sensors are able to detect the temperature. The new temperature point sensor is based on the measurement of a varying linear birefringence in optical fibers, produced by the thermal influence of epoxy adhesives. On the basis of the different thermal expansion coefficients of the fiber and the adhesive, a temperature change results in mechanical pressure. Because of this pressure a linear birefringence is induced into the fiber and the polarization of the light is influenced. Experimental investigations show a significant and repeatable temperature dependence of the ellipticity of the light in the range of measurement between 10 degree(s)C and +120 degree(s)C.

Paper Details

Date Published: 31 August 2000
PDF: 8 pages
Proc. SPIE 4074, Applications of Optical Fiber Sensors, (31 August 2000); doi: 10.1117/12.397883
Show Author Affiliations
Christian Helmig, Univ. of Dortmund (Germany)
Joerg Teunissen, Univ. of Dortmund (Germany)

Published in SPIE Proceedings Vol. 4074:
Applications of Optical Fiber Sensors
Alan J. Rogers, Editor(s)

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