Optical fiber temperature sensor based on phase shift by aluminum thermal expansion

Jin-Maun Maun Ho; M. T. Shiu

doi:10.1117/12.169931

9 March 1994 Optical fiber temperature sensor based on phase shift by aluminum thermal expansion

Jin-Maun Maun Ho, M. T. Shiu

Proceedings Volume 2070, Fiber Optic and Laser Sensors XI; (1994) https://doi.org/10.1117/12.169931
Event: Optical Tools for Manufacturing and Advanced Automation, 1993, Boston, MA, United States

Abstract

A method of using aluminum tube wounded by single-mode fiber as a temperature sensor is proposed in this paper. The optical source of this temperature sensing system is a 2-frequency He-Ne laser. When the temperature of fiber on aluminum is changed, a phase shift in optical signal appears. By using electronic circuits, this phase shift can be detected and compared with a reference signal obtained directly from the laser source. Then one will be able to get the information on temperature according to the difference of phases between these two signals. Two experiments have been performed in the laboratory. In the first experiment the aluminum tube is 12 cm in diameter, 8 cm in height, and 2 mm in thickness, with a fiber length about 60 m wounded 155 turns. The sensitivity is 2.1 X 10^-2 rad/ degree(s)C-m. In the second experiment, the tube is 7.5 cm in diameter and height, and 2 mm in thickness, with a fiber about 10 m length wounded in 21 turns. The sensitivity is 4.9 X 10^-2 rad/ degree(s)C-m. The temperature from 5 degree(s)C to 80 degree(s)C are measured with this design.

Citation Download Citation

Jin-Maun Maun Ho and M. T. Shiu "Optical fiber temperature sensor based on phase shift by aluminum thermal expansion", Proc. SPIE 2070, Fiber Optic and Laser Sensors XI, (9 March 1994); https://doi.org/10.1117/12.169931

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