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Fiber Optic Distributed Sensors for High-resolution Temperature Field Mapping
Published on: November 7, 2016
Multiplexed fiber Fabry-Perot temperature sensor system using white-light interferometry
Optics Letters
|November 21, 2007
Summary
A new monitoring system achieves 0.013°C resolution for fiber Fabry-Perot interferometer (FFPI) temperature sensors. This system uses dual interferometers to accurately track temperature changes, enabling multiplexing of multiple sensors.
Area of Science:
- Optical Engineering
- Sensor Technology
- Metrology
Background:
- Fiber Fabry-Perot interferometers (FFPIs) are sensitive to temperature changes.
- Accurate monitoring of FFPIs is crucial for various applications.
- Existing monitoring systems may face limitations in resolution or stability.
Purpose of the Study:
- To develop and demonstrate a novel monitoring system for FFPI temperature sensors.
- To achieve high-resolution temperature measurements using FFPIs.
- To explore the feasibility of multiplexing multiple FFPI sensors.
Main Methods:
- Utilized a broadband light source and a scanned Michelson interferometer to generate a fringe pattern from the FFPI.
- Employed a second Michelson interferometer with a distributed-feedback laser to compensate for scanning mirror translation rate variations.
- Demonstrated coherence multiplexing of three FFPI sensors.
Main Results:
- Achieved a temperature resolution of 0.013 degrees C (0.0025 fringe).
- The temporal position of the fringe pattern directly correlates with changes in the FFPI's optical length.
- Successfully demonstrated the multiplexing of three FFPI sensors.
Conclusions:
- The novel monitoring system offers high-resolution temperature sensing capabilities.
- The system's design effectively corrects for external perturbations, enhancing measurement accuracy.
- Coherence multiplexing shows potential for scalable, multi-point temperature monitoring with FFPI sensors.
