Calibration of temperature sensitivity coefficient of fiber Bragg grating at ultra-low temperature

JIN Kai; DING Li-yun; GUO Hui-yong; CHEN Gang-chuan; HU Yong

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Calibration of temperature sensitivity coefficient of fiber Bragg grating at ultra-low temperature

更新时间：2023-05-10

- Calibration of temperature sensitivity coefficient of fiber Bragg grating at ultra-low temperature
- Optics and Precision Engineering Pages: 1-7(2023)
- 作者机构：
  
  武汉理工大学光纤传感技术国家工程实验室，湖北武汉 430070
- 作者简介：
- 基金信息：
- DOI：
  CLC： TN253;TP212
- Received：26 February 2021，
  
  Revised：09 April 2021，
  
  Published Online：10 May 2023，
- 稿件说明：
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金凯,丁莉芸,郭会勇等.超低温条件下光纤光栅温敏系数标定[J].光学精密工程,

JIN Kai,DING Li-yun,GUO Hui-yong,et al.Calibration of temperature sensitivity coefficient of fiber Bragg grating at ultra-low temperature[J].Optics and Precision Engineering,
金凯,丁莉芸,郭会勇等.超低温条件下光纤光栅温敏系数标定[J].光学精密工程, DOI：10.37188/OPE..0001

JIN Kai,DING Li-yun,GUO Hui-yong,et al.Calibration of temperature sensitivity coefficient of fiber Bragg grating at ultra-low temperature[J].Optics and Precision Engineering, DOI：10.37188/OPE..0001

摘要

为了解决超低温环境下光栅温敏系数（K

B，T

）标定的可靠性问题，将参考温度计探头和光纤Bragg光栅传感器封装在自主设计的非接触液氮冷却方式的测温模具中，在93～293 K的大范围超低温环境下进行标定实验探究，并利用裸栅的温敏系数和涂层的热膨胀系数来验证本实验设计的可信性。实验结果表明，参考温度计的初始最大温变速率为1.8 K/min，有效降低了测温模具的温变速率，改善了参考温度计与被标光栅之间的温度一致性，测试结果与可比文献的结果一致。裸栅的低温非线性效应导致其温敏系数从9.18 pm/K@293K降到2.19 pm/K@93K，室温下有机改性陶瓷（organic modified ceramic，ORMOCER）材料的热膨胀系数为3.7×10

-6

-1

，单边厚度50 μm的ORMOCER涂层的温敏系数为4.43 pm/K，该涂层光栅在93 K时K

B，T

= 7.17 pm/K，显著提高了测温光栅的温敏系数和线性度。

Abstract

In order to solve the reliability problem of grating temperature-sensitive coefficient （K

B，T

） calibration in the ultra-low temperature environment， the reference thermometer probe and fiber Bragg grating sensor were encapsulated in the self-designed non-contact liquid nitrogen cooling temperature measuring mold， and the calibration experiments were carried out in a wide range of ultra-low temperatures ranging from 93-293 K， and the thermal sensitivity coefficient of bare grid and thermal expansion coefficient of coating are used to verify the credibility of the experimental design. Experimental results indicate that the maximum initial temperature change rate of the reference thermometer is 1.8 K/min， which effectively reduces the temperature change rate of the temperature measuring mold and improves the temperature consistency between the reference thermometer and the labeled grating. The test results are in good agreement with the results of the comparable literature. The temperature sensitivity of bare gate decreases from 9.18 pm/K@293K to 2.19 pm/K@93K due to its low temperature nonlinearity， the thermal expansion coefficient of organic modified ceramic （ORMOCER） is 3.7×10

-6

-1

at room temperature. The temperature sensitivity coefficient of ORMOCER coating with one-side thickness of 50μm is 4.43 pm/K. At 93 K， K

B，T

= 7.17 pm/K， the temperature sensitivity coefficient and linearity of the coating grating are significantly improved.

关键词

Keywords

references

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