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Updated: Aug 25, 2025
09:03
A Silicon-tipped Fiber-optic Sensing Platform with High Resolution and Fast Response
Published on: January 7, 2019
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Resonant fiber-optic thermometry with high resolution and wide range
Optics Express
|October 14, 2022
Summary
We developed a novel thermometer using a fiber Bragg grating Fabry-Perot cavity and beat frequency interrogation. This high-resolution sensor accurately measures temperature changes, ideal for critical applications like deep ocean monitoring.
Area of Science:
- Optoelectronics
- Metrology
- Fiber Optics
Background:
- Accurate temperature measurement is crucial in various scientific and industrial fields.
- Existing thermometers may lack the required resolution or dynamic range for specific applications.
- Fiber Bragg grating Fabry-Perot cavities offer potential for high-performance sensing.
Purpose of the Study:
- To develop and demonstrate a high-resolution and wide-range thermometer.
- To utilize a fiber Bragg grating Fabry-Perot cavity (FBG-FP) with beat frequency interrogation for temperature sensing.
- To achieve precise temperature measurements for demanding applications.
Main Methods:
- Constructed a sensor head using a fiber Bragg grating Fabry-Perot cavity (FBG-FP).
- Employed two distributed feedback (DFB) lasers locked using the Pound-Drever-Hall (PDH) technique.
- Interfered laser beams to generate a beat frequency signal proportional to temperature changes.
Main Results:
- Achieved a high-resolution temperature measurement of 2×10-4 °C with 1 s averaging.
- Demonstrated a wide dynamic range of approximately 109 °C.
- Exhibited good long-term stability due to reference frequency introduction.
Conclusions:
- The developed FBG-FP thermometer offers superior performance for precise temperature monitoring.
- The sensor is suitable for applications requiring detection of minute temperature variations.
- Potential applications include deep ocean temperature measurement and other critical scientific fields.
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