Displacement detection apparatus including an error correction s

Details Displacement detection apparatus including an error correction s Displacement detection apparatus including an error correction s

1995-10-19

1999-08-24

Wachsman, Hal Dodge

Data processing: measuring, calibrating, or testing

Measurement system

Dimensional determination

702158, 702 97, 32420712, 32420723, 32420725, G01B 702

Patent

active

059436395

ABSTRACT:
A displacement detecting apparatus includes an error correcting circuit through which a pair of sine wave signals detected by a detecting head unit are corrected. A signal detecting circuit receives the pair of sine wave signals whose phases are shifted by about 90.degree., and detects a magnitude of one of the two sine wave signal when the other one of the two sine wave signals crosses with a reference voltage level. The error correcting circuit calculates an error correction amount of each sine wave signal according to the detected magnitude of the signal and eliminates the calculated error correction amount from the signals. Therefore, the sine wave signals of position information are accurately corrected in direct-current component, voltage ratio and phase difference.

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Patent Abstracts of Japan, vol. 17, No. 487 (E-1427), Sep. 3, 1993.

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