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<p>A high-sensitivity no-core fiber (NCF) temperature sensor based on Snell’s law is proposed and successfully fabricated for precise temperature monitoring in specific chemical reaction processes. The sensor is constructed by splicing multimode fibers (MMFs) on both sides of an NCF segment and coating its outer surface with the UV glue. Temperature sensing experiments are carried out to investigate the effects of NCF length and diameters on the temperature sensitivity. Experimental results demonstrate that the sensor achieves a maximum temperature sensitivity of 7.19&#xa0;nm/°C within the temperature range from 40&#xa0;°C to 60&#xa0;°C, which is 3 to 5 times higher than existing similar temperature sensors. In addition, the sensor exhibits a resolution of 0.00515&#xa0;°C, enabling the detection of tiny temperature fluctuations. With a simple structure, high sensitivity, and no need for metal modification unlike surface plasmon resonance fiber sensors, this NCF temperature sensor demonstrates significant potential for precise temperature monitoring in various chemical reaction, such as silver mirror reaction and chromogenic reaction.</p>

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High-sensitivity no-core fiber temperature sensor based on Snell’s law for specific chemical reaction monitoring

  • 期刊论文

  • 发表日期：

    2026年1月21日

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  • Haihao Fu,
  • Yuying Guo,
  • Qiang Shi,
  • Xin Wang,
  • Shuqin Lou,
  • Xinzhi Sheng

摘要

A high-sensitivity no-core fiber (NCF) temperature sensor based on Snell’s law is proposed and successfully fabricated for precise temperature monitoring in specific chemical reaction processes. The sensor is constructed by splicing multimode fibers (MMFs) on both sides of an NCF segment and coating its outer surface with the UV glue. Temperature sensing experiments are carried out to investigate the effects of NCF length and diameters on the temperature sensitivity. Experimental results demonstrate that the sensor achieves a maximum temperature sensitivity of 7.19 nm/°C within the temperature range from 40 °C to 60 °C, which is 3 to 5 times higher than existing similar temperature sensors. In addition, the sensor exhibits a resolution of 0.00515 °C, enabling the detection of tiny temperature fluctuations. With a simple structure, high sensitivity, and no need for metal modification unlike surface plasmon resonance fiber sensors, this NCF temperature sensor demonstrates significant potential for precise temperature monitoring in various chemical reaction, such as silver mirror reaction and chromogenic reaction.