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Proceedings Paper

Hybrid temperature sensor based upon internal-effect principle
Author(s): Ali M. Golbazi; Nicholas D. Kefalas
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Paper Abstract

Over the past years, fiber optic temperature sensors have been constructed for a variety of applications. Some utilize bi-metallic transducers which are attached to the ends of Y branched bifurcated fiber bundle cables and operate much as proximity sensors, while others are based on blackbody radiation principles, such as those generated by a hollow sapphire tube. The latter type of sensor is typically used for high temperature ranges, (500 - 2400 F). As the sapphire tube is subjected to heat, it begins to radiate light which propagates through the cylinder and is detected by an optical meter at the opposite end of the tube. Thus, an optical- temperature relationship is generated. Additionally, other temperature sensors are also based on interferometric principles. It is proposed that a Hybrid Temperature sensor based upon the internal effect principle which, for experimental and proof-of-concept purposes, can be modeled utilizing a simple fiber-coupler assembly. It will be demonstrated that such a sensor can be operated efficiently in the 0 - 200 F range, (with upper and lower temperature range maximums being material limited). Theoretical documentation is presented for both single and multi-mode fiber sensor models. Experimental results are also presented for the multi-mode case utilizing an 850 nm laser source.

Paper Details

Date Published: 15 November 1993
PDF: 12 pages
Proc. SPIE 1952, Surveillance Technologies and Imaging Components, (15 November 1993); doi: 10.1117/12.161418
Show Author Affiliations
Ali M. Golbazi, Univ. of New Haven (United States)
Nicholas D. Kefalas, United Technologies/Sikorsky Aircraft (United States)

Published in SPIE Proceedings Vol. 1952:
Surveillance Technologies and Imaging Components
Sankaran Gowrinathan; C. Bruce Johnson; James F. Shanley, Editor(s)

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