Optical temperature probe for extended industrial monitoring

P. J. Henderson; N. A. Pilling; Richard V. Smith; Gordon R. Jones

doi:10.1117/12.166845

7 February 1994 Optical temperature probe for extended industrial monitoring

P. J. Henderson, N. A. Pilling, Richard V. Smith, Gordon R. Jones

Proceedings Volume 2072, Fiber Optic Physical Sensors in Manufacturing and Transportation; (1994) https://doi.org/10.1117/12.166845
Event: Optical Tools for Manufacturing and Advanced Automation, 1993, Boston, MA, United States

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.

Citation Download Citation

P. J. Henderson, N. A. Pilling, Richard V. Smith, and Gordon R. Jones "Optical temperature probe for extended industrial monitoring", Proc. SPIE 2072, Fiber Optic Physical Sensors in Manufacturing and Transportation, (7 February 1994); https://doi.org/10.1117/12.166845

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