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Fiber Optic Distributed Sensors for High-resolution Temperature Field Mapping
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In-Bulk Temperature Profile Mapping Using Fiber Bragg Grating in Fluids.

Sylvie Su1, Tianyi Niu1,2, Tobias Vogt1

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

Sensors (Basel, Switzerland)
|October 28, 2023
PubMed
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 measurementmultiplexingoptical fibertemperature mappingtemperature sensor

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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.