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Intrinsic fiber Fabry-Perot temperature sensor with fiber Bragg grating mirrors
Optics Letters
|November 21, 2007
Summary
This study presents a novel fiber Fabry-Perot interferometer (FFPI) sensor using fiber Bragg grating (FBG) mirrors. This enhanced sensor design extends dynamic range for precise ambient temperature measurements.
Area of Science:
- Optoelectronics
- Fiber Optic Sensors
- Interferometry
Background:
- Fiber Fabry-Perot interferometers (FFPIs) are sensitive optical sensors.
- Conventional FFPIs often have limited dynamic range due to mirror characteristics.
- Fiber Bragg gratings (FBGs) offer unique optical frequency-dependent reflectance.
Purpose of the Study:
- To develop an FFPI sensor with an extended dynamic range.
- To utilize broadband FBGs as mirrors in an FFPI.
- To demonstrate precise ambient temperature measurement using the novel sensor.
Main Methods:
- Fabrication of an FFPI using broadband fiber Bragg grating (FBG) mirrors.
- Modulation of a distributed-feedback laser to induce chirping.
- Analysis of the FFPI's reflectance modulation based on FBG properties.
Main Results:
- The reflectance of FBG mirrors varied with optical frequency, enabling distinguishable fringes.
- The sensor achieved an extended dynamic range compared to conventional FFPIs.
- Ambient temperature was accurately determined within the range of 25 to 170 °C.
Conclusions:
- The proposed FFPI sensor design with FBG mirrors effectively extends sensor dynamic range.
- This approach allows for high-resolution temperature sensing.
- The technology shows promise for advanced optical sensing applications.
