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To enhance the sensitivity of fiber Bragg grating (FBG) magnetic sensors, this study proposes a novel optimization method based on pre-compressive stress regulation. A multi-parameter coupling transfer model of “magnetic field intensity–strain–wavelength shift” is developed to theoretically analyze the influence of pre-stress on sensor performance. An FBG magnetic sensor structure with adjustable pre-stress is designed and experimentally tested under different pre-stress conditions. The results indicate that when a pre-stress of 10 MPa is applied, the sensor sensitivity reaches 11.19 pm/mT, achieving a 62.88% improvement compared to the unstressed condition. However, excessive pre-stress leads to mechanical constraint effects, suppressing magnetostriction and reducing sensitivity. Therefore, the optimal pre-stress value is determined to be 10 MPa to achieve the best sensor performance. This study validates the effectiveness of pre-stress regulation as an optimization strategy and provides new insights into the design of high-performance fiber-optic magnetic sensors.

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Tuning the Sensitivity of the Optical Fiber Magnetic Sensor Through Controlling the Pre-compressive Stress

  • 会议论文

  • 发表日期：

    2026年

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  • Chaojiang He,
  • Cunfu He,
  • Peng Li,
  • Xiucheng Liu

摘要

To enhance the sensitivity of fiber Bragg grating (FBG) magnetic sensors, this study proposes a novel optimization method based on pre-compressive stress regulation. A multi-parameter coupling transfer model of “magnetic field intensity–strain–wavelength shift” is developed to theoretically analyze the influence of pre-stress on sensor performance. An FBG magnetic sensor structure with adjustable pre-stress is designed and experimentally tested under different pre-stress conditions. The results indicate that when a pre-stress of 10 MPa is applied, the sensor sensitivity reaches 11.19 pm/mT, achieving a 62.88% improvement compared to the unstressed condition. However, excessive pre-stress leads to mechanical constraint effects, suppressing magnetostriction and reducing sensitivity. Therefore, the optimal pre-stress value is determined to be 10 MPa to achieve the best sensor performance. This study validates the effectiveness of pre-stress regulation as an optimization strategy and provides new insights into the design of high-performance fiber-optic magnetic sensors.