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<p>A temperature-insensitive U-shaped liquid level sensor based on single-mode fiber (SMF) cascaded with double spheres is proposed. Cladding modes are excited by spherical structures. U-shaped liquid level sensors are made by flame-burning the center of the sensing region, cladding modes are further excited due to fiber bending and create more mode interference. To study the sensitivities of the sensors, U-shaped fiber optic liquid level sensors with different bending diameters are simulated and fabricated. As the level rises, there is a significant red shift in the interference dip. The experimental results indicate that the sensitivity of the liquid level is as high as 410.51 pm/mm in the range of 0–30&#xa0;mm. The sensor exhibits insensitive properties from 20℃ to 70℃. In addition, the sensor has low cost, high sensitivity, and simple structure advantages, which makes it used in petrochemical and other applications.</p>

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Temperature-insensitive U-shaped liquid level sensor based on single-mode fiber cascaded with double spheres

  • 期刊论文

  • 发表日期：

    2025年5月10日

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  • Muhua Wang,
  • Zhengrong Tong,
  • Weihua Zhang,
  • Danyang Liu,
  • Yixi Liu,
  • Xue Wang

摘要

A temperature-insensitive U-shaped liquid level sensor based on single-mode fiber (SMF) cascaded with double spheres is proposed. Cladding modes are excited by spherical structures. U-shaped liquid level sensors are made by flame-burning the center of the sensing region, cladding modes are further excited due to fiber bending and create more mode interference. To study the sensitivities of the sensors, U-shaped fiber optic liquid level sensors with different bending diameters are simulated and fabricated. As the level rises, there is a significant red shift in the interference dip. The experimental results indicate that the sensitivity of the liquid level is as high as 410.51 pm/mm in the range of 0–30 mm. The sensor exhibits insensitive properties from 20℃ to 70℃. In addition, the sensor has low cost, high sensitivity, and simple structure advantages, which makes it used in petrochemical and other applications.