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<p>To enhance the sensitivity of temperature and humidity sensors, and eliminate response band overlap, this work proposes a temperature and humidity sensor that is based on surface plasmon resonance (SPR) and photonic crystal fiber (PCF) with an H-shaped structure. As a functional layer, titanium dioxide can significantly enhance the intensity of surface plasmon waves (SPW) and increase the effective sensing area. On one side of the H-shaped plane, a gold film coated with polydimethylsiloxane (PDMS) is used for temperature measurement, while on the other side, a gold film coated with agarose gel is used for humidity measurement. The finite element method (FEM) is employed to analyze the sensor’s performance, revealing that its responses occur in different frequency bands, enabling simultaneous measurement of temperature and humidity. The simulation results indicate that when the temperature ranges from 0 to 50&#xa0;°C and the humidity ranges from 10 to 70%RH, the average sensitivities are − 3.13&#xa0;nm/°C and 3.28&#xa0;nm/%RH, respectively. This makes the proposed sensor have good application prospects in environmental monitoring, the food industry, medical sensing, and other fields.</p>

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H-Shaped PCF Sensor for Simultaneous Temperature and Humidity Monitoring Based on Surface Plasmon Resonance

  • 期刊论文

  • 发表日期：

    2025年7月22日

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  • Xiaoyong Gan,
  • Hongzhi Xu,
  • Shubo Jiang

摘要

To enhance the sensitivity of temperature and humidity sensors, and eliminate response band overlap, this work proposes a temperature and humidity sensor that is based on surface plasmon resonance (SPR) and photonic crystal fiber (PCF) with an H-shaped structure. As a functional layer, titanium dioxide can significantly enhance the intensity of surface plasmon waves (SPW) and increase the effective sensing area. On one side of the H-shaped plane, a gold film coated with polydimethylsiloxane (PDMS) is used for temperature measurement, while on the other side, a gold film coated with agarose gel is used for humidity measurement. The finite element method (FEM) is employed to analyze the sensor’s performance, revealing that its responses occur in different frequency bands, enabling simultaneous measurement of temperature and humidity. The simulation results indicate that when the temperature ranges from 0 to 50 °C and the humidity ranges from 10 to 70%RH, the average sensitivities are − 3.13 nm/°C and 3.28 nm/%RH, respectively. This makes the proposed sensor have good application prospects in environmental monitoring, the food industry, medical sensing, and other fields.