Displacement meter with stared displacement values

Details Displacement meter with stared displacement values Displacement meter with stared displacement values

1991-07-16

1994-02-15

Turner, Samuel A.

Optics: measuring and testing

By dispersed light spectroscopy

Utilizing a spectrometer

356345, G01B 902

Patent

active

052871665

ABSTRACT:
Laser displacement meter for measuring a displacement of an object such as a moving distance, a moving angle, and a moving speed. The meter has a generator circuit for generating a displacement signal; another generator circuit for generating a first signal which corresponds to R sin.theta. value of the displacement signal, and a second signal which corresponds to R cos.theta. value of the displacement signal (R represents an amplitude, .theta. represents a phase of the displacement signal); a memory for storing a displacement value being defined by the first signal and the second signal where .theta. is between 0 and 2.pi.; a circuit for transferring a position signal corresponding to the displacement value from the memory according to the first signal and the second signal; a counter for counting a number, being defined as dividing .theta. by 2.pi., corresponding to the displacement signal and for determining the displacement of the object according to the counted number and the position signal.

REFERENCES:
patent: 4139304 (1979-02-01), Redman et al.
patent: 4360271 (1982-11-01), Downs et al.
patent: 4643577 (1987-02-01), Roth et al.
patent: 4655594 (1987-04-01), Wittekoek et al.
patent: 4792230 (1988-12-01), Naganuma et al.
"Optical and Electro-Optical Engineering Contact", vol. 26, No. 2, (1988), pp. 107-108.
"High-Resolution Laser Encoder and High-Accuracy Index Unit as Applications of Laser Encoder", National Technical Report, vol. 36, No. 2, Apr. 1990, pp. 114-120.

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