Apparatus and methods employing harmonic analysis for measuring the difference in phase between two coherent beams
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United States of America Patent
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Aug 6, 1996
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N/A
app pub date -
Jan 13, 1995
filing date -
Jan 14, 1994
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Abstract
An improved interferometric measuring system that includes a system for measuring a phase difference between two coherent beams oscillating at substantially the same frequency, and including a phase modulator disposed into optical communication with one of the coherent beams and being adapted to generate a phase modulated beam signal. A beam combiner combines the phase modulated beam signal with the second one of the coherent beams to generate a combined beam signal. A detector element measures the intensity of the combined beam signal and a date processor analyzes the intensity to determine from the harmonic components of the combined beam signal the phase difference between the two coherent beams.
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