Hybrid temperature sensor based upon internal-effect principle

Ali M. Golbazi; Nicholas D. Kefalas

doi:10.1117/12.161418

15 November 1993 Hybrid temperature sensor based upon internal-effect principle

Ali M. Golbazi, Nicholas D. Kefalas

Proceedings Volume 1952, Surveillance Technologies and Imaging Components; (1993) https://doi.org/10.1117/12.161418
Event: Optical Engineering and Photonics in Aerospace Sensing, 1993, Orlando, FL, United States

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.

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Ali M. Golbazi and Nicholas D. Kefalas "Hybrid temperature sensor based upon internal-effect principle", Proc. SPIE 1952, Surveillance Technologies and Imaging Components, (15 November 1993); https://doi.org/10.1117/12.161418

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KEYWORDS

Sensors

Temperature sensors

Temperature metrology

Multimode fibers

Connectors

Single mode fibers

Data analysis

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