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Updated: Jun 19, 2026

Fiber Optic Distributed Sensors for High-resolution Temperature Field Mapping
Published on: November 7, 2016
Temperature and Lateral Pressure Sensing Using a Sagnac Sensor Based on Cascaded Tilted Grating and
Yifan Liu1,2, Yujian Li1, Pin Xu1
1Department of Electrical and Electronic Engineering, The Hong Kong Polytechnic University, Hong Kong, China.
Abstract:
This study introduces a Sagnac Interferometer (SI) fiber sensor that integrates Polarization-Maintaining Fibers (PMFs) with a Tilted Fiber Bragg Grating (TFBG) for the dual-parameter measurement of strain and lateral pressure. By incorporating a 6° TFBG with PMFs into the SI sensor, its sensitivity is significantly enhanced, enabling advanced multi-parameter sensing capabilities. The sensor demonstrates a temperature sensitivity of -1.413 nm/°C and a lateral pressure sensitivity of -4.264 dB/kPa, as validated by repeated experiments. The results exhibit excellent repeatability and high precision, underscoring the sensor's potential for robust and accurate multi-parameter sensing applications.
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