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Fiber Optic Distributed Sensors for High-resolution Temperature Field Mapping
Published on: November 7, 2016
Intermodal interferometer for strain and temperature sensing fabricated in birefringent boron doped microstructured
G Statkiewicz-Barabach1, J P Carvalho, O Frazão
1Wroclaw University of Technology, Institute of Physics, Wybrzeze Wyspianskiego 27, 50-370 Wroclaw, Poland. Gabriela.Statkiewicz@pwr.wroc.pl
Applied Optics
|July 21, 2011
Summary
We developed a compact fiber optic sensor using microstructured fiber for simultaneous strain and temperature measurements. This novel sensor interrogates fringe visibility and displacement for accurate, real-time monitoring.
Area of Science:
- Optoelectronics
- Fiber Optics Sensors
- Photonics
Background:
- Microstructured fibers offer unique light propagation properties.
- Intermodal interference in optical fibers can be utilized for sensing applications.
- Polarimetric signals can modulate interferometric fringe visibility.
Purpose of the Study:
- To fabricate and characterize a compact in-line fiber interferometric sensor.
- To demonstrate simultaneous strain and temperature measurement capabilities.
- To investigate the use of a boron-doped, highly birefringent microstructured fiber.
Main Methods:
- Fabrication of the sensor using a CO(2) laser on boron-doped, two-mode, highly birefringent microstructured fiber.
- Inducing intermodal interference via two fiber tapers at the fiber output.
- Modulating fringe visibility with a polarimetric differential signal.
- Testing the sensor for strain (0-17 mstrain) and temperature (20-700°C) measurements.
Main Results:
- Achieved sensitivities of -2.51 nm/mstrain and -0.0256 1/mstrain for strain.
- Achieved sensitivities of 16.7 pm/°C and 5.74×10(-5) 1/°C for temperature.
- Demonstrated simultaneous measurement of strain and temperature by analyzing fringe displacement and visibility.
Conclusions:
- The proposed fiber optic sensor enables simultaneous and accurate measurement of strain and temperature.
- The sensor's design leverages intermodal interference and polarimetric modulation for enhanced sensing.
- This compact in-line sensor shows potential for various environmental and structural monitoring applications.
