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Fiber Optic Distributed Sensors for High-resolution Temperature Field Mapping
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Pressure-insensitive low-density polyethylene diaphragm-based optical fiber temperature sensors
Optics Express
|August 13, 2025
Summary
This study introduces a novel optical fiber temperature sensor for harsh environments. The Fabry-Perot sensor uses a special diaphragm for accurate, pressure-insensitive temperature readings.
Area of Science:
- Optoelectronics
- Fiber optics
- Sensor technology
Background:
- Harsh environments demand highly sensitive temperature measurement.
- Existing sensors often struggle with pressure interference.
- Optical fiber sensors offer potential for robust temperature monitoring.
Purpose of the Study:
- To develop a pressure-insensitive optical fiber temperature sensor.
- To utilize Fabry-Perot (FP) cavity length changes for temperature sensing.
- To enable precision temperature monitoring in challenging conditions.
Main Methods:
- Designed an optical fiber sensor using a diaphragm.
- Employed low-density polyethylene with air permeability for the diaphragm.
- Utilized thermal expansion-induced diaphragm deformation to alter FP cavity length.
- Investigated sensor response to temperature and pressure variations.
Main Results:
- The sensor demonstrated high sensitivity to temperature.
- The sensor exhibited insensitivity to pressure changes.
- Cavity length sensitivity measured at 0.626 µm over 15 to 50 °C.
- Wavelength sensitivity reached 12.922 nm/°C.
Conclusions:
- The developed optical fiber sensor effectively measures temperature in harsh environments.
- The pressure-insensitive design enhances reliability.
- Achieved high wavelength sensitivity allows for precision temperature monitoring.
