Citation

Abushagur, Abdulfatah A. G. and Yusoff, Zulfadzli and Ibrahim@Ghazali, Siti Azlida and Sarker, Md Tanjil and Hamzah, Abdulwahhab Essa and Arsad, Norhana and Bakar, Ahmad Ashrif A. (2026) Experimental validation of bandwidth modulation in fiber bragg gratings for decoupling axial and transverse forces. Discover Applied Sciences, 8 (7). ISSN 3004-9261

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Abstract

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.

Item Type:	Article
Uncontrolled Keywords:	Chirp fiber bragg grating, Force sensor, Tapered FBG, Microsurgery instruments
Subjects:	T Technology > T Technology (General)
Divisions:	Faculty of Artificial Intelligence & Engineering (FAIE)
Depositing User:	Ms Suzilawati Abu Samah
Date Deposited:	04 Aug 2026 07:52
Last Modified:	04 Aug 2026 07:52
URII:	http://shdl.mmu.edu.my/id/eprint/16516

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