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<p>We introduce an eccentric core-to-cladding cross-interface fiber Bragg grating (ECIFBG) and demonstrate its application as a novel multi-purpose sensor for torsion, temperature, and strain measurements. The ECIFBG is fabricated using femtosecond laser plane-to-plane inscribing technology. By exploiting the reflection peak generated from the effective index difference between the core and cladding, along with the coupling coefficient discrepancy between transmitted light and evanescent waves, torsion, temperature and strain can be precisely determined through monitoring variations in reflectivity and central wavelength. The sensor achieves twist rate sensitivities of <InlineEquation ID="IEq1"> <EquationSource Format="TEX">\(-\)</EquationSource> </InlineEquation>0.302 dB/(rad/m) and 0.298 dB/(rad/m) within a range of -14 rad/m to 14 rad/m, while demonstrating temperature and strain sensitivities of 0.011 nm/℃ and 0.900 pm/µ<InlineEquation ID="IEq2"> <EquationSource Format="TEX">\(\varepsilon \)</EquationSource> </InlineEquation>, respectively. The ECIFBG offers advantages including compact size, rapid fabrication, and fine reproducibility.</p>

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Eccentric cross-interface fiber Bragg grating and its responses to torsion, temperature, and strain

  • 期刊论文

  • 发表日期：

    2025年11月4日

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  • Ruixiang Chen,
  • Haibin Chen,
  • Yalin Yu,
  • Weichen Chen,
  • Yujun Du,
  • Weiguang Zhang

摘要

We introduce an eccentric core-to-cladding cross-interface fiber Bragg grating (ECIFBG) and demonstrate its application as a novel multi-purpose sensor for torsion, temperature, and strain measurements. The ECIFBG is fabricated using femtosecond laser plane-to-plane inscribing technology. By exploiting the reflection peak generated from the effective index difference between the core and cladding, along with the coupling coefficient discrepancy between transmitted light and evanescent waves, torsion, temperature and strain can be precisely determined through monitoring variations in reflectivity and central wavelength. The sensor achieves twist rate sensitivities of \(-\) 0.302 dB/(rad/m) and 0.298 dB/(rad/m) within a range of -14 rad/m to 14 rad/m, while demonstrating temperature and strain sensitivities of 0.011 nm/℃ and 0.900 pm/µ \(\varepsilon \) , respectively. The ECIFBG offers advantages including compact size, rapid fabrication, and fine reproducibility.