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<p>We propose a π-phase-shifted long period fiber grating (π-PS-LPFG) sensor capable of simultaneously measuring temperature and strain or temperature and curvature. The π-PS-LPFG is prepared by introducing a π phase shift at the center offset position of the long period fiber grating through precise control of two stepping motors using filament heating method. The transmission spectrum of the π-PS-LPFG exhibits two adjacent attenuation bands following the introduction of a π phase shift. Experiments were conducted to assess the sensor’s characteristics in terms of strain, curvature, and temperature, thereby validating its capability for simultaneous measurement of temperature and strain or temperature and curvature through cross-matrix equations. Experimental results indicate that the sensor demonstrates excellent sensitivity, with sensitivities for temperature, curvature, and strain measured at 74 pm/°C, −7.5&#xa0;nm/m⁻¹, and − 5.2 pm/µε respectively. Moreover, the sensor features low manufacturing cost, simple structure, and high sensitivity, emphasizing its considerable potential for applications in multi-parameter sensing.</p>

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Simultaneous measurement of temperature and strain or temperature and curvature based on π-phase-shifted long period fiber grating

  • 期刊论文

  • 发表日期：

    2026年6月16日

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  • Xinkai Wang,
  • Huibin Wang,
  • Minwen Xu,
  • Wenlei Yang

摘要

We propose a π-phase-shifted long period fiber grating (π-PS-LPFG) sensor capable of simultaneously measuring temperature and strain or temperature and curvature. The π-PS-LPFG is prepared by introducing a π phase shift at the center offset position of the long period fiber grating through precise control of two stepping motors using filament heating method. The transmission spectrum of the π-PS-LPFG exhibits two adjacent attenuation bands following the introduction of a π phase shift. Experiments were conducted to assess the sensor’s characteristics in terms of strain, curvature, and temperature, thereby validating its capability for simultaneous measurement of temperature and strain or temperature and curvature through cross-matrix equations. Experimental results indicate that the sensor demonstrates excellent sensitivity, with sensitivities for temperature, curvature, and strain measured at 74 pm/°C, −7.5 nm/m⁻¹, and − 5.2 pm/µε respectively. Moreover, the sensor features low manufacturing cost, simple structure, and high sensitivity, emphasizing its considerable potential for applications in multi-parameter sensing.