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White-light interferometric fiber-optic strain sensor from three-peak-wavelength broadband LED source
Applied Optics
|February 9, 2008
Summary
A novel white-light fiber-optic interferometer uses a special three-peak-wavelength LED to simplify central-fringe identification in strain sensing. This system offers linear strain measurement with a tapered cantilever beam, showing sensor strain is less than the matrix strain.
Area of Science:
- Optics and Photonics
- Fiber Optic Sensors
- Interferometry
Background:
- White-light interferometry is crucial for precise measurements.
- Identifying the central fringe in white-light interferometry can be challenging.
- Fiber optic sensors offer advantages in strain measurement applications.
Purpose of the Study:
- To present a white-light fiber-optic interferometer for strain sensing.
- To utilize a special three-peak-wavelength LED as a light source.
- To simplify central-fringe identification in white-light interferometry.
Main Methods:
- A Michelson interferometer configuration was employed.
- One arm of the interferometer served as the strain sensor.
- A special three-peak-wavelength LED was used as the light source.
- Gaussian spectrum distribution function was applied for spectrum decomposition.
Main Results:
- The special LED source simplifies central-fringe identification.
- A linear relationship was observed between strain and sensor output.
- The measured strain by the fiber-optic sensor was consistently lower than the surrounding matrix strain.
Conclusions:
- The developed white-light fiber-optic interferometer effectively measures strain.
- The special three-peak-wavelength LED is advantageous for fringe identification.
- The sensor exhibits reliable linear performance in strain sensing applications.
