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<p>Low-temperature measurement is widely applied in fields such as aerospace, energy transportation, and structural health monitoring. In response to the low sensitivity of Fiber Bragg Grating (FBG) temperature sensors in low-temperature environments, a bimetallic sensitized FBG temperature sensor structure is proposed. Leveraging the difference in thermal expansion coefficients between Kovar alloy and 7075 aluminum for sensitization design, ANSYS is utilized for thermal stress analysis of the sensor, followed by the fabrication of the sensor prototype based on simulation results. Low-temperature glass soldering technique is employed instead of traditional adhesives to achieve a two-point welding fixation of the FBG with the sensitization structure, and a metal casing is used for encapsulation and protection. Finally, a temperature testing system is constructed to evaluate the sensor’s performance. Experimental results indicate that within the temperature range of − 60 to 50&#xa0;°C, the developed sensor exhibits a temperature sensitivity of 77.075&#xa0;pm/°C, a linear fit degree of 0.999, and good stability. The sensor’s simple packaging makes it easily realizable and holds significant potential for application in low-temperature measurement fields.</p>

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Research on bimetallic sensitized FBG temperature sensor for low temperature measurement

  • 期刊论文

  • 发表日期：

    2025年2月13日

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  • Zhongchao Qiu,
  • Xin Luo,
  • Jiemei Ma,
  • Yuntian Teng,
  • Xiaoyong Fan

摘要

Low-temperature measurement is widely applied in fields such as aerospace, energy transportation, and structural health monitoring. In response to the low sensitivity of Fiber Bragg Grating (FBG) temperature sensors in low-temperature environments, a bimetallic sensitized FBG temperature sensor structure is proposed. Leveraging the difference in thermal expansion coefficients between Kovar alloy and 7075 aluminum for sensitization design, ANSYS is utilized for thermal stress analysis of the sensor, followed by the fabrication of the sensor prototype based on simulation results. Low-temperature glass soldering technique is employed instead of traditional adhesives to achieve a two-point welding fixation of the FBG with the sensitization structure, and a metal casing is used for encapsulation and protection. Finally, a temperature testing system is constructed to evaluate the sensor’s performance. Experimental results indicate that within the temperature range of − 60 to 50 °C, the developed sensor exhibits a temperature sensitivity of 77.075 pm/°C, a linear fit degree of 0.999, and good stability. The sensor’s simple packaging makes it easily realizable and holds significant potential for application in low-temperature measurement fields.