Circuitry for processing signals occurring in a heterodyne interferometer
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United States of America Patent
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Nov 14, 2000
Grant Date -
N/A
app pub date -
Dec 27, 1999
filing date -
Feb 28, 1997
priority date (Note) -
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Abstract
A signal processing circuit for a reference signal occurring in a heterodyne interferometer and a measured signal. The underlying frequency modulation of the radiation source of the heterodyne interferometer results in phase jumps in both signals. Signal filtering of both the reference signal and the measured signal with a gate signal removes from both signals those signal components that have the same phase sign. Further simplification of the signal processing results from signal interpolation by band pass filters and signal down-mixing into a lower frequency range below the heterodyne frequency. The input signals processed by the circuit can be further processed by a conventional phase comparator.
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