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Proceedings Paper

Precise optical differential thermometer sensor based on interferometric measurement of thermal expansion coefficient
Author(s): M. Lucki; L. Bohac; Richard Zeleny; M. Davidkova Antosova
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Paper 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.

Paper Details

Date Published: 15 May 2014
PDF: 9 pages
Proc. SPIE 9141, Optical Sensing and Detection III, 914124 (15 May 2014); doi: 10.1117/12.2054346
Show Author Affiliations
M. Lucki, Czech Technical Univ. in Prague (Czech Republic)
L. Bohac, Czech Technical Univ. in Prague (Czech Republic)
Richard Zeleny, Czech Technical Univ. in Prague (Czech Republic)
M. Davidkova Antosova, Vocational Technical College and Engineering School for Elektrotechnics (Czech Republic)

Published in SPIE Proceedings Vol. 9141:
Optical Sensing and Detection III
Francis Berghmans; Anna G. Mignani; Piet De Moor, Editor(s)

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