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Optical scanning extrinsic Fabry-Perot interferometer for absolute microdisplacement measurement
Applied Optics
|February 12, 2008
Summary
This study introduces an optical-scanning, dual-fiber system for precise microdisplacement measurement. It uses two fiber-optic Fabry-Perot cavities for accurate, self-calibrating absolute gap length determination.
Area of Science:
- Optics and Photonics
- Metrology
- Fiber Optics
Background:
- Accurate microdisplacement measurement is crucial in various scientific and industrial applications.
- Traditional interferometry methods often face challenges with calibration and environmental stability.
Purpose of the Study:
- To develop a novel optical-scanning, dual-fiber extrinsic Fabry-Perot interferometer system.
- To achieve absolute measurement of microdisplacement independent of wavelength-scanning accuracy.
- To enable simple self-calibration of the reference cavity length.
Main Methods:
- Utilizing two air-gapped extrinsic Fabry-Perot cavities formed by fiber end faces.
- Employing an optical-scanning system with a variable wavelength.
- Comparing the gap length of a sensing head with a reference cavity using wavelength as an interconverter.
Main Results:
- The system provides absolute measurement of microdisplacement.
- Measurement accuracy is independent of wavelength-scanning precision.
- The reference cavity length can be self-calibrated by adjusting the sensing head length.
Conclusions:
- The developed dual-fiber extrinsic Fabry-Perot interferometer offers a robust method for absolute microdisplacement sensing.
- The self-calibration feature enhances the system's practicality and reliability.
- This technology has potential applications in precision engineering and scientific instrumentation.
