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High-resolution and large-dynamic-range temperature sensor using fiber Bragg grating Fabry-Pérot cavity
Optics Express
|June 22, 2021
Summary
A novel fiber Bragg grating sensor offers high-resolution temperature measurement with a wide dynamic range. This advanced sensor is ideal for detecting minute temperature shifts in challenging environments like the deep ocean.
Area of Science:
- Optics and Photonics
- Sensor Technology
- Physical Measurement
Background:
- Accurate temperature sensing is crucial for various scientific and industrial applications.
- Existing sensors often face limitations in resolution or dynamic range, especially for detecting subtle thermal variations.
Purpose of the Study:
- To propose and demonstrate a high-resolution, large-dynamic-range temperature sensor.
- To leverage fiber Bragg gratings (FBGs) and laser frequency dither locking for enhanced performance.
Main Methods:
- Utilizing a pair of fiber Bragg gratings (FBGs) configured as a Fabry-Pérot cavity (FP).
- Implementing a laser frequency dither locking technique for precise measurement.
- Experimental validation of the proposed sensor design.
Main Results:
- Achieved a remarkable temperature resolution of 7×10-4 °C.
- Demonstrated a wide dynamic range of approximately 46 °C.
- Successfully validated the sensor's capability for detecting small temperature changes.
Conclusions:
- The FBG-based Fabry-Pérot sensor with laser locking offers superior temperature sensing capabilities.
- This technology is particularly well-suited for applications requiring ultra-precise temperature detection, such as deep ocean monitoring.
