Optical low-cost temperature point sensor

Christian Helmig; Joerg Teunissen

doi:10.1117/12.397883

31 August 2000 Optical low-cost temperature point sensor

Christian Helmig, Joerg Teunissen

Proceedings Volume 4074, Applications of Optical Fiber Sensors; (2000) https://doi.org/10.1117/12.397883
Event: Symposium on Applied Photonics, 2000, Glasgow, United Kingdom

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.

Citation Download Citation

Christian Helmig and Joerg Teunissen "Optical low-cost temperature point sensor", Proc. SPIE 4074, Applications of Optical Fiber Sensors, (31 August 2000); https://doi.org/10.1117/12.397883

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