Method and device for redundant distance measurement and mismatch cancellation in phase-measurement systems
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United States of America Patent
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Dec 9, 2008
Grant Date -
Feb 15, 2007
app pub date -
Aug 7, 2006
filing date -
Aug 8, 2005
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Abstract
The method serves for canceling errors caused by mismatch of different signal paths in a photodetector with a plurality (k) of storage elements for the photogenerated signals, as typically used in phase-measurement systems. The signal-capturing process is performed in at least two measurement cycles (j) . A first cycle (j=1) is executed with the conventional setup with no phase delay in the control signals. It is followed by further measurement cycles (j=2, 3, 4) which use control signals shifted by a constant phase shift (90.degree.). Corresponding signals are read out through different signal paths. At the end, the signals corresponding to a certain phase (.PHI.) are added, thus canceling possible offset values.
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