Error correction arrangement for digital length or angle measuri

Details Error correction arrangement for digital length or angle measuri Error correction arrangement for digital length or angle measuri

1983-03-09

1985-04-23

Martin, Jr., William D.

Geometrical instruments

Area integrators

Electrical

33125C, G01B 1104

Patent

active

045120820

ABSTRACT:
A length measuring system of the type having a division on a scale which is scanned by a scanning unit in order to measure the relative position of a slide with respect to a bed of a machine is disclosed. In order to correct division errors and/or machine errors between a follower fastened to the slide and the scanning unit, there is arranged an electromechanical adjusting element between the follower and the slide. In a first preferred embodiment, this adjusting element takes the form of a piezoelectric element, which, in accordance with electric correction signals applied thereto, varies in length and thereby corrects the relative position of the scanning unit and the follower in accordance with the desired error correction course. Alternate embodiments employ magnetostrictive cores and electromagnetic coil arrangements to accomplish the desired error correction.

REFERENCES:
patent: 3775655 (1973-11-01), Du Vall
patent: 4170829 (1979-10-01), Nelle
patent: 4262423 (1981-04-01), Affa

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