Optical fiber temperature sensors based on bending loss

ZHOU Guang-li; E Shu-lin; DENG Wen-yuan

In order to deduce that the bending loss was a function of curvature radius and temperature,WKB method was used to solve the number of modes of non-uniform straight fibers, the effective refractive index, the cut-off of propagation constant of bending fibers and thermo-optic effect of fibers were introduced to the number of modes of non-uniform straight fiber also.Choosing multimode graded-index optical fibers to get a temperature sensor, the sensitivity of the sensor was 0.1/℃ and the temperature sensing range was 10℃～70℃.The results indicate that the smaller the curvature radius and the temperature, the bigger the bending loss.Bending loss can be used to measure the temperature.

Corresponding author: E Shu-lin, eshulin@sohu.com;

1. Key Laboratory of Modern Applied Optics, Changchun Institute of Optics, Fine Mechanics and Physics, Chinese Academy of Sciences, Changchun 130033, China;

2. Graduate School, Chinese Academy of Sciences, Beijing 100049, China

Received Date: 2007-11-21

Accepted Date: 2008-01-23

Available Online: 2009-02-25

Abstract: In order to deduce that the bending loss was a function of curvature radius and temperature,WKB method was used to solve the number of modes of non-uniform straight fibers, the effective refractive index, the cut-off of propagation constant of bending fibers and thermo-optic effect of fibers were introduced to the number of modes of non-uniform straight fiber also.Choosing multimode graded-index optical fibers to get a temperature sensor, the sensitivity of the sensor was 0.1/℃ and the temperature sensing range was 10℃～70℃.The results indicate that the smaller the curvature radius and the temperature, the bigger the bending loss.Bending loss can be used to measure the temperature.

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Reference (19)

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Optical fiber temperature sensors based on bending loss

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