Fiber bragg grating (FBG)-based pore pressure sensor utilizing bellows system

Burhanuddin, W. A. F. W. and Ahmad, Harith and Sa'Ad, M. S. M. and Alias, M. A. and Ismail, M. F. (2025) Fiber bragg grating (FBG)-based pore pressure sensor utilizing bellows system. IEEE Sensors Journal, 25 (3). pp. 4706-4714. ISSN 1530-437X, DOI https://doi.org/10.1109/JSEN.2024.3521011.

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Abstract

This study presents the design, fabrication, and performance evaluation of an optical fiber Bragg grating (FBG)-based pore pressure sensor for geotechnical borehole applications. The sensor comprises a cylindrical body, 3-D, printed from polylactic acid (PLA) material, with dimensions of 40 mm in diameter and 155 mm in length. The transducer holding the FBG utilizes a square bellows design and was 3-D printed using thermoplastic polyurethane (TPU) material, taking advantage of its good flexibility. This transducer was positioned inside a cylindrical housing to allow pore pressure measurement to take place effectively. Two FBGs, denoted FBG P and FBG T, were used to measure pore pressure and temperature, respectively. The experimental results demonstrate a pressure sensitivity of 1.224 pm/kPa for FBG P with a linearity of 99.41%. Besides that, the results also demonstrate FBG T's effectiveness in giving temperature compensation to FBG P during pore pressure measurement. This innovative sensor design offers a compact and versatile solution for pore pressure measurement in geotechnical applications, combining the benefits of FBG technology with 3-D printing capabilities.

Item Type: Article
Funders: Ministry of Education, Malaysia, Universiti Malaya [Grant No: BKS002-2023; BKS002-2024; RK021-2019]
Uncontrolled Keywords: 3-D printing technology; Bellows system; Fiber Bragg gratings (FBGs); Optical fiber sensor; Pore pressure sensor; 3-D printing technology; Bellows system; Fiber Bragg
Subjects: Q Science > QC Physics
T Technology > TK Electrical engineering. Electronics Nuclear engineering
Divisions: Faculty of Science > Department of Physics
Depositing User: Ms. Juhaida Abd Rahim
Date Deposited: 03 Oct 2025 07:24
Last Modified: 03 Oct 2025 07:24
URI: http://eprints.um.edu.my/id/eprint/47925

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