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<p>This study introduces a novel bandwidth-modulation-based sensing principle designed to address the challenge of cross-sensitivity in fiber Bragg grating (FBG) force sensors. Unlike conventional wavelength-shift-based methods, the proposed approach leverages changes in spectral bandwidth to achieve directional selectivity and inherent temperature immunity. A proof-of-concept prototype was developed using a dual-structure configuration, integrating a tapered FBG (TFBG) for axial strain detection and a surface-embedded chirped FBG (CFBG) for transverse force measurement. Experimental validation demonstrates that the CFBG bandwidth response is effectively isolated from axial loads, maintaining a stable bandwidth with an axial sensitivity of 0.00 pm/N. Furthermore, the TFBG demonstrates a clear bandwidth narrowing in response to axial loads with a sensitivity of 54.3 pm/N, attributed to the non-uniform strain profile of the taper geometry. While the current work focuses on the validation of the sensing principle within a 2-DOF framework, the results confirm that bandwidth tuning provides a robust, selective, and temperature-immune alternative for force sensing in biomedical and robotic applications.</p>

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Experimental validation of bandwidth modulation in fiber bragg gratings for decoupling axial and transverse forces

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2026年5月19日

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  • Abdulfatah A. G. Abushagur,
  • Zulfadzli Yusoff,
  • Siti Azlida Ibrahim,
  • Md Tanjil Sarker,
  • Abdulwahhab Essa Hamzah,
  • Norhana Arsad,
  • Ahmad Ashrif A. Bakar

摘要

This study introduces a novel bandwidth-modulation-based sensing principle designed to address the challenge of cross-sensitivity in fiber Bragg grating (FBG) force sensors. Unlike conventional wavelength-shift-based methods, the proposed approach leverages changes in spectral bandwidth to achieve directional selectivity and inherent temperature immunity. A proof-of-concept prototype was developed using a dual-structure configuration, integrating a tapered FBG (TFBG) for axial strain detection and a surface-embedded chirped FBG (CFBG) for transverse force measurement. Experimental validation demonstrates that the CFBG bandwidth response is effectively isolated from axial loads, maintaining a stable bandwidth with an axial sensitivity of 0.00 pm/N. Furthermore, the TFBG demonstrates a clear bandwidth narrowing in response to axial loads with a sensitivity of 54.3 pm/N, attributed to the non-uniform strain profile of the taper geometry. While the current work focuses on the validation of the sensing principle within a 2-DOF framework, the results confirm that bandwidth tuning provides a robust, selective, and temperature-immune alternative for force sensing in biomedical and robotic applications.