Conversion device for laser interferometic measuring apparatus

Details Conversion device for laser interferometic measuring apparatus Conversion device for laser interferometic measuring apparatus

1990-05-31

1993-02-02

Lall, Parshotam S.

Boots, shoes, and leggings

364770, 356 45, 356358, G01B 1114

Patent

active

051843137

ABSTRACT:
An A-phase pulse (S.sub.A) and a B-phase pulse (S.sub.B) are transmitted from a laser interferometic measuring device to a conversion device (5). When the distance-to-be-measured (l) is increasing, a conversion coefficient (D.sub.R) is added to or subtracted from an initial value in an arithmetic calculator (53) at the rising edge and the trailing edge of the pulses (S.sub.A, S.sub.B). The conversion coefficient has a digital value of M-digits and represents a reference distance .lambda./N, where .lambda. is the wavelength of a laser beam (LB.sub.1, LB.sub.2) employed in the laser measuring machine and M and N are positive integers. A predetermined unit distance in the metric system corresponds to a unit number in the (M+1)-th digit. A distance pulse signal (S.sub.L) is generated in response to a carry signal and a borrow signal from the arithmetic calculator, and is used in expressing a change of the distance in the metric system.

REFERENCES:
patent: 3573805 (1971-04-01), Kelling
patent: 4492464 (1985-01-01), Bourdet et al.
patent: 4583856 (1986-04-01), Moore
patent: 4643577 (1987-02-01), Roth et al.
patent: 4729653 (1988-03-01), Kobayashi
patent: 4803646 (1989-02-01), Burke et al.
patent: 4807264 (1989-02-01), Bauer
patent: 4879732 (1989-11-01), Dorosz
patent: 4989222 (1991-01-01), Lutts et al.
Patent Abstracts of Japan; vol. 13, No. 120 (P-846)(3468) Mar. 24, 1989; & JP-A-63292002 (NTT) Nov. 29, 1988.
Patent Abstracts of Japan; vol. 4, No. 110 (P-22(3468), Aug. 8, 1980; & JP-A-55069004 (Toshiba) May 24, 1980.

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