Parallel structured optical fiber in-line Fabry-Perot interferometers for high temperature sensing.

Area of Science:

• Optics and Photonics
• Fiber Optic Sensing
• Interferometry

Background:

• High-temperature sensing is crucial for extreme environment monitoring.
• Traditional sensors face limitations in accuracy and durability at extreme temperatures.
• Fabry-Perot interferometers offer potential for precise optical measurements.

Purpose of the Study:

• To propose and demonstrate a novel parallel structured optical fiber in-line Fabry-Perot interferometer system.
• To enable unambiguous high-temperature measurements over a large range.
• To develop a sensor suitable for extreme environment monitoring.

Main Methods:

• Fabrication of a device with three parallel-connected Fabry-Perot cavities within an optical fiber.
• Superposition of three independent fringe patterns at the sensor output.
• Analysis of superimposed fringe patterns to achieve unambiguous measurements.

Main Results:

• Demonstration of a compact and robust sensor design.
• Achieved unambiguous fringe patterns enabling accurate measurements.
• Exhibited excellent high-temperature sustainability.

Conclusions:

• The parallel structured optical fiber Fabry-Perot interferometer is a promising technology for high-temperature sensing.
• The sensor's design ensures unambiguous measurements and durability in extreme conditions.
• This approach is well-suited for reliable monitoring in harsh environments.