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

Document Type

Article

Publication Date

2-1-2025

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.

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

Publication Title

IEEE Sensors Journal

Divisions

PHYSICS

Funders

Ministry of Education, Malaysia,Universiti Malaya [Grant No: BKS002-2023; BKS002-2024; RK021-2019]

Volume

25

Issue

3

Publisher

Institute of Electrical and Electronics Engineers (IEEE)

Publisher Location

445 HOES LANE, PISCATAWAY, NJ 08855-4141 USA

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