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Updated: Jul 12, 2025

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

In-Bulk Temperature Profile Mapping Using Fiber Bragg Grating in Fluids.

Sylvie Su¹, Tianyi Niu^1,2, Tobias Vogt¹

¹Helmholtz-Zentrum Dresden-Rossendorf, Bautzner Landstraße 400, 01328 Dresden, Germany.

Sensors (Basel, Switzerland)

|October 28, 2023

Summary

This summary is machine-generated.

Fiber Bragg Grating (FBG) sensors, when minimally disturbing liquid flows, offer robust temperature measurement. A novel assembly procedure with real-time strain correction enhances accuracy for spatial and temporal temperature field detection.

Keywords:

Fiber Bragg Grating (FBG)in-bulk measurement multiplexing optical fiber temperature mapping temperature sensor

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Published on: March 8, 2020

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Last Updated: Jul 12, 2025

Fiber Optic Distributed Sensors for High-resolution Temperature Field Mapping

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Published on: November 7, 2016

Writing Bragg Gratings in Multicore Fibers

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Design, Instrumentation and Usage Protocols for Distributed In Situ Thermal Hot Spots Monitoring in Electric Coils using FBG Sensor Multiplexing

Design, Instrumentation and Usage Protocols for Distributed In Situ Thermal Hot Spots Monitoring in Electric Coils using FBG Sensor Multiplexing

Published on: March 8, 2020

Area of Science:

Physics
Materials Science
Fluid Dynamics

Background:

Accurate temperature measurement in liquid flows is crucial for various scientific and industrial applications.
Traditional sensors can disturb flow dynamics and introduce inaccuracies.
Fiber Bragg Grating (FBG) sensors offer potential for non-intrusive temperature sensing.

Purpose of the Study:

To evaluate the feasibility of using unencapsulated Fiber Bragg Grating (FBG) sensors for measuring temperature variations in liquid flows.
To develop and validate a method for enhancing the robustness and accuracy of FBG-based temperature measurements in dynamic fluid environments.

Main Methods:

Experimental validation using a benchmark setup with 24 FBG sensors and parallel thermocouple measurements.
Implementation of a special assembly procedure involving pre-tensioning of FBG fibers to improve stiffness.
Development of a real-time strain correction method using a reference FBG sensor for accurate relative temperature readings.

Main Results:

Demonstrated successful recording of spatial and temporal temperature changes in liquid metal (GaInSn) and water.
Validated the accuracy of FBG sensors against thermocouples in controlled temperature gradient and heating scenarios.
Showcased the capability to detect linear temperature distributions along the FBG fiber.

Conclusions:

Unencapsulated FBG sensors, with appropriate assembly and strain correction, are capable of accurate temperature measurements in liquid flows.
The proposed method allows for detailed characterization of temperature fields, both spatially and temporally.
The study highlights the potential and limitations of FBG sensors for advanced fluid temperature monitoring.