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Proceedings Paper

Optical temperature probe for extended industrial monitoring
Author(s): P. J. Henderson; N. A. Pilling; Richard V. Smith; Gordon R. Jones
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Paper Abstract

A novel optical transducer has been developed for measuring relatively slowly varying temperatures within inaccessible but mechanically stable environments. It is ideally suited to monitoring geological and industrial sites underground. As the transducer may be embedded for many years, it is based on technology known for stable long-term operation which has been optically adapted for novel use. The transducer uses a bimetallic strip in conjunction with an optical displacement sensor to modulate the spectrum of an incident optical signal. The spectral changes are detected chromatically to remove dependence of optical intensity fluctuations. The effect of displacement perturbations caused for instance by thermal expansion and mechanical stress was reduced by choosing the bimetal to have a large deflection.

Paper Details

Date Published: 7 February 1994
PDF: 7 pages
Proc. SPIE 2072, Fiber Optic Physical Sensors in Manufacturing and Transportation, (7 February 1994); doi: 10.1117/12.166845
Show Author Affiliations
P. J. Henderson, Univ. of Liverpool (United Kingdom)
N. A. Pilling, Univ. of Liverpool (United Kingdom)
Richard V. Smith, Univ. of Liverpool (United Kingdom)
Gordon R. Jones, Univ. of Liverpool (United Kingdom)

Published in SPIE Proceedings Vol. 2072:
Fiber Optic Physical Sensors in Manufacturing and Transportation
John W. Berthold III; Richard O. Claus; Michael A. Marcus; Robert S. Rogowski, Editor(s)

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