Object displacement detection

Details Object displacement detection Object displacement detection

1991-06-18

1993-08-10

Turner, Samuel A.

Optics: measuring and testing

By dispersed light spectroscopy

Utilizing a spectrometer

356358, G01B 902

Patent

active

052354067

ABSTRACT:
This invention relates to signal processing for enhancing detection resolving power on the basis of a periodic signal obtained in a displacement detecting device such as an encoder or a laser length measuring machine, and on the basis of input sine wave and cosine wave signals which are the references, a sine wave signal and a cosine wave signal of a frequency integer times as high as the frequency of the reference signals are produced by calculation by the use of adders, multipliers, etc.

REFERENCES:
patent: 3410976 (1968-11-01), Watson
patent: 3626308 (1971-12-01), Paine
patent: 4676645 (1987-06-01), Taniguchi et al.
patent: 4700390 (1987-10-01), Machida
patent: 5067089 (1991-11-01), Ishii et al.

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