Dc shift error correction for electro-optical measuring system

Details Dc shift error correction for electro-optical measuring system Dc shift error correction for electro-optical measuring system

G - Physics

01

B

33/49, 340/74

G01B 11/14 (2006.01) G01D 5/244 (2006.01) G01D 5/36 (2006.01) G06F 11/00 (2006.01)

Patent

CA 1159126

ABSTRACT In an electro-optical measuring system which utilizes a sin/cos signal pair to determine the extent and direction of physical displacement, measure- ment 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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