A fiber optic-film temperature sensor taking advantage of thermal optical effect as well as temperature-dependent absorption of semiconductor

Min Li; Yulin Li

doi:10.1117/12.867461

9 November 2010 A fiber optic-film temperature sensor taking advantage of thermal optical effect as well as temperature-dependent absorption of semiconductor

Min Li, Yulin Li

Author Affiliations +

Proceedings Volume 7853, Advanced Sensor Systems and Applications IV; 78530W (2010) https://doi.org/10.1117/12.867461
Event: Photonics Asia 2010, 2010, Beijing, China

Abstract

After several decades, the development and application of absorptive fiber semiconductor temperature sensor have been slowed down for the difficulty to satisfy the critical requirement of the special wavelength and broadband lightsource. On the other hand, temperature-dependent refractive index, i.e., thermal-optic effect of the semiconductor materials has not gained much attention beyond the semiconductor processing industry. With a much larger temperature-dependent refractive index than the common optical materials, such as glass and quartz, many semiconductor are also popular coating materials on fiber. Taking advantage of the interaction of large temperature-dependent refractive index and temperature-dependant absorption coefficient of semiconductor, we manage to build a very small, sensitive, simple and low cost fiber temperature probe operating at communication wavelength. We develop a sensor model for an optical fiber-germanium (Ge) film type temperature sensor based on the modified optical film theory, which involves temperature-dependent absorption below infrared transparent window of Ge as second major cause for reflectivity change beside thermal optical effect. Investigation of the feasibility and sensitivity of the fiber-film probe has been carried out theoretically and experimentally within the temperature regime of -20-120°C, which is the most used temperature range for industry monitoring. A sensitivity of reflectivity change about 0.001/°C has been demonstrated by the experimental results of the novel designed sensor. Further discussion on the potential of sensitivity and further application are presented.

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Min Li and Yulin Li "A fiber optic-film temperature sensor taking advantage of thermal optical effect as well as temperature-dependent absorption of semiconductor", Proc. SPIE 7853, Advanced Sensor Systems and Applications IV, 78530W (9 November 2010); https://doi.org/10.1117/12.867461

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KEYWORDS

Absorption

Reflectivity

Refractive index

Germanium

Semiconductors

Sensors

Fiber optics sensors

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