15 May 2014 Precise optical differential thermometer sensor based on interferometric measurement of thermal expansion coefficient
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Abstract
Knowing a thermal expansion coefficient and measured exact thermal expansion, it is possible to design a very sensitive sensor measuring temperature differential. A Michelson interferometer is used to determine temperature changes. It measures linear expansion on a metal object, e.g. a copper rod, as a change in length in response to a change in temperature. Based on the obtained interferograms and knowing the value of thermal expansion coefficient, temperature differential can be calculated. The accuracy of the procedure can be determined by using the exact differential method based on the measurement errors for linear expansion, and initial length. The contribution of this paper is the employment of Michelson interferometer to design a very sensitive differential thermometer measuring with the accuracy of one thousandth degree Celsius. It results from the achieved precision of measuring the optical path length changes in the range of hundreds nanometers. The advantage of this sensor is its precision and noncontact procedure.
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M. Lucki, L. Bohac, Richard Zeleny, M. Davidkova Antosova, "Precise optical differential thermometer sensor based on interferometric measurement of thermal expansion coefficient", Proc. SPIE 9141, Optical Sensing and Detection III, 914124 (15 May 2014); doi: 10.1117/12.2054346; https://doi.org/10.1117/12.2054346
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