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Resolving quadrature fringes in real time
Mark A Zumberge1, Jonathan Berger, Matthew A Dzieciuch
1Institute of Geophysics and Planetary Physics, Scripps Institution of Oceanography, University of California, San Diego, La Jolla, California 92093-0225, USA. mzumberge@ucsd.edu
Applied Optics
|February 13, 2004
Summary
A new system uses digitized quadrature fringe signals analyzed in real time to create a high-resolution displacement transducer. This technology achieves 5 x 10(-13) m Hz(-1/2) resolution with inexpensive Michelson interferometer components.
Area of Science:
- * Optics and Photonics
- * Metrology and Measurement Science
Background:
- * Interferometers commonly produce two quadrature fringe signals.
- * The phase relationship of these signals indicates changes in optical path length (increasing or decreasing).
Purpose of the Study:
- * To develop a real-time system for analyzing quadrature fringe signals.
- * To create a linear, high-resolution, wide-dynamic-range displacement transducer.
Main Methods:
- * Digitization of two quadrature fringe signals.
- * Real-time analysis using a digital signal processor (DSP).
- * Implementation in a simple Michelson interferometer setup.
Main Results:
- * Achieved a linear displacement transducer.
- * Demonstrated high resolution and wide dynamic range.
- * Attained a resolution of 5 x 10(-13) m Hz(-1/2) at 2 Hz with inexpensive components.
Conclusions:
- * The developed system provides a cost-effective method for high-precision displacement measurement.
- * Real-time digital signal processing of quadrature fringes enables advanced metrology applications.