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Updated: Jan 15, 2026

Fiber Optic Distributed Sensors for High-resolution Temperature Field Mapping

Fiber Optic Distributed Sensors for High-resolution Temperature Field Mapping

Published on: November 7, 2016

Hybrid-Mechanism Distributed Sensing Using Forward Transmission and Optical Frequency-Domain Reflectometry.

Shangwei Dai^1,2, Huajian Zhong^1,2, Xing Rao^1,2

¹State Key Laboratory of Radio Frequency Heterogeneous Integration, Key Laboratory of Optoelectronic Devices and Systems of Ministry of Education/Guangdong Province, College of Physics and Optoelectronic Engineering, Shenzhen University, Shenzhen 518060, China.

Sensors (Basel, Switzerland)

|October 16, 2025

Summary

This summary is machine-generated.

This study introduces a novel hybrid fiber-optic sensing system combining forward-transmission distributed vibration sensing (FTDVS) and optical frequency-domain reflectometry (OFDR). The new method enhances long-distance, multi-point vibration detection and low-frequency sensing capabilities.

Keywords:

OFDR fiber optic sensing forward transmission hybrid system low-frequency vibration

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Last Updated: Jan 15, 2026

Fiber Optic Distributed Sensors for High-resolution Temperature Field Mapping

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Published on: November 7, 2016

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Published on: March 20, 2017

A Silicon-tipped Fiber-optic Sensing Platform with High Resolution and Fast Response

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Published on: January 7, 2019

Area of Science:

Photonics
Sensing Technology
Optical Engineering

Background:

Fiber-optic sensing offers high sensitivity and wide frequency response over long distances.
Existing forward-transmission distributed vibration sensing (FTDVS) struggles with multi-point vibration positioning and low-frequency detection.

Purpose of the Study:

To develop and validate a hybrid distributed sensing system merging FTDVS and optical frequency-domain reflectometry (OFDR).
To overcome limitations in vibration positioning and low-frequency detection for long-range fiber-optic sensing.

Main Methods:

Integration of FTDVS and OFDR systems sharing a single probe light source with stable linear optical frequency sweeping.
Implementation of a novel nearest neighbor signal replacement (NSR) method for phase demodulation discontinuity.
Experimental validation of the hybrid system's performance.

Main Results:

The hybrid system successfully positioned vibration signals from 0 to 900 Hz over a 21 km sensing distance.
The FTDVS module maintained functionality for high-frequency vibrations up to 71 km.
Demonstrated simultaneous measurement of dynamic and quasi-static events.

Conclusions:

The hybrid FTDVS-OFDR architecture represents a significant advancement in distributed fiber-optic sensing.
This novel approach enables simultaneous long-distance sensing and wide frequency response.
The system is well-suited for monitoring long-distance infrastructure for both dynamic and quasi-static events.