DC Shift error correction for electro-optical measuring system
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United States of America Patent
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-
Mar 9, 1982
Grant Date -
N/A
app pub date -
Dec 14, 1979
filing date -
Dec 14, 1979
priority date (Note) -
Expired
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Abstract
In an electro-optical measuring system which utilizes a sin/cos signal pair to determine the extent and direction of physical displacement, measurement errors often occurring as a result of extraneous DC level shifts in generated signals are corrected in a procedure which regularly samples the maxima and minima of the signals, derives from those values the median DC levels of the signals, compares the median levels to a reference DC level in the system to determine any differences, and applies any detected differences as corrective factors to position measurement signal values.
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