Research on highly sensitive Fabry-Pérot cavity sensing technology in frozen soil
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1. College of Science, Xi'an Shiyou University, Xi'an 710065, China;2. Key Laboratory of Measurement and Control Technology for Oil and Gas Wells, Xi'an Shiyou University, Xi'an 710065, China;3. AVIC Jonhon Optronic Technology Co., Ltd., Luoyang 471003, China[* This work has been supported by the National Natural Science Foundation of China (Nos.61735014 and 61927812), the Operation Fund of Logging Key Laboratory of Group Company (No.2021DQ0107-11), and the Graduate Student Innovation Fund of Xi'an Shiyou University (Nos.YCS22213178 and YCS22213185).

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    Abstract:

    A high-sensitivity low-temperature sensor based on Fabry-Pérot interferometer (FPI) is fabricated and experimentally demonstrated in this letter. The FPI air cavity is fabricated by splicing a single-mode optical fiber (SMF) with a glass capillary tube partially filled with ultraviolet (UV) glue. Due to the high coefficient of thermal expansion of UV-glue, the sensor can obtain high sensitivity. Experimental results show that the sensor has a temperature sensitivity of −3.753 4 nm/℃ in the temperature range of −4—4 ℃, and the linearity is 0.999. The engineering performance of the sensor is tested by simulating the frozen soil environment. The proposed sensor has high sensitivity and good temperature response. The sensor structure is compact and simple, low cost and has potential application in the cryogenic detection environment.

    Reference
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LIU Qinpeng, WANG Danyang, WANG Chunfang, LI Xingrui, GAO Hong, YU Dakuang. Research on highly sensitive Fabry-Pérot cavity sensing technology in frozen soil[J]. Optoelectronics Letters,2023,19(4):205-209

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History
  • Received:October 18,2022
  • Revised:December 09,2022
  • Online: April 19,2023
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