Temperature detection of hot air tubes with distributed optical fiber based on light center frequency matching method

OUYANG Qiangqiang; FANG Ting; GU Wenping; WANG Yan; HU Xingliu

doi:10.7510/jgjs.issn.1001-3806.2016.04.018

In order to solve drift problem of distributed optical fiber temperature sensorfor detection of blast of hot air tubes, a new solution of light center frequency matching (LCFM) method was proposed after theoretical derivation and experimental verification. By measuring the difference between the incident optical current and the reference photo current to adjust F-P light filter bandwidth, filter center frequency can always be kept in pass-band range of the filter. The match of filter bandwidth and light center frequency was achieved. The curves between Raman ratio and distance substantially coincided at different ambient temperatures when using frequency matching method. The linearity of the distributed optical fiber temperature sensor was about 0.52%. The experimental results show that LCFM method can reduce temperature drift of a fiber optical sensor and does not affect the linearity of the sensor. It is of great significance for achieving effective temperature measurement on hot air tube surface to combined center frequency matching mothod with distributed optical fiber temperature sensing technology.

Temperature detection of hot air tubes with distributed optical fiber based on light center frequency matching method

Corresponding author: FANG Ting, flyting_69@163.com;

1. College of Electrical & Information Engineering, Anhui University of Technology, Maanshan 243032, China

Received Date: 2015-04-24

Accepted Date: 2015-06-25

Available Online: 2016-07-25

Abstract: In order to solve drift problem of distributed optical fiber temperature sensorfor detection of blast of hot air tubes, a new solution of light center frequency matching (LCFM) method was proposed after theoretical derivation and experimental verification. By measuring the difference between the incident optical current and the reference photo current to adjust F-P light filter bandwidth, filter center frequency can always be kept in pass-band range of the filter. The match of filter bandwidth and light center frequency was achieved. The curves between Raman ratio and distance substantially coincided at different ambient temperatures when using frequency matching method. The linearity of the distributed optical fiber temperature sensor was about 0.52%. The experimental results show that LCFM method can reduce temperature drift of a fiber optical sensor and does not affect the linearity of the sensor. It is of great significance for achieving effective temperature measurement on hot air tube surface to combined center frequency matching mothod with distributed optical fiber temperature sensing technology.

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Reference (18)

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Temperature detection of hot air tubes with distributed optical fiber based on light center frequency matching method

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