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Fiber Optic Distributed Sensors for High-resolution Temperature Field Mapping

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Published on: November 7, 2016

Study on an All-Optic Temperature Sensor Based on a Low-Coherent Optical Interferometry.

Fanni Gu¹, Yirui Wen², Sergei Krasovskii^1,3

¹DUT-BSU Joint Institute, Dalian University of Technology, Dalian 116024, China.

Sensors (Basel, Switzerland)

|December 31, 2025

Summary

This summary is machine-generated.

This study presents an all-optic temperature sensor for harsh environments. The novel spring-based design offers reliable temperature monitoring in the petrochemical industry.

Keywords:

intrinsic all-optic temperature sensor low-coherent Michelson interferometry spring sensor thermoelasticity principle

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Area of Science:

Materials Science
Optical Engineering
Sensor Technology

Background:

Optical temperature sensors offer explosion-proof advantages for industries like petrochemicals.
Existing sensors face limitations due to environmental compatibility issues.
There is a need for robust, intrinsically safe temperature sensing solutions.

Purpose of the Study:

To develop and demonstrate an all-optic temperature sensor with enhanced environmental compatibility.
To create a compact, spring-based optical sensor for thermoelastic temperature measurement.
To provide a reliable temperature sensing alternative for demanding industrial applications.

Main Methods:

An anti-bending single-mode optical fiber was integrated into a stainless steel tube spring.
The fiber-embedded spring was configured as a sensing arm in a low-coherent Michelson interferometer.
Thermoelastic changes in the spring's length were used to detect temperature variations via optical path difference.

Main Results:

The developed optical temperature sensor demonstrated a hysteresis within ±1.16 °C.
The sensor achieved a sensitivity of 0.34 °C over a calibration range of -25 to 65 °C.
Performance was validated against a standard platinum resistance temperature detector (PT-100).

Conclusions:

The novel spring-based optical temperature sensor shows promise for industrial applications, particularly in the petrochemical sector.
The intrinsic explosion-proof nature and environmental compatibility address key limitations of current sensors.
This design serves as a valuable reference for future intrinsic optical temperature sensor development.