Spatial filter type speed measuring apparatus

Details Spatial filter type speed measuring apparatus Spatial filter type speed measuring apparatus

1988-09-06

1990-05-01

Buczinski, Stephen C.

Optics: measuring and testing

Velocity or velocity/height measuring

With light detector

356 1, G01P 336, G01C 300

Patent

active

049213458

ABSTRACT:
Light equipment is provided for irradiating the measuring object and forming light spot on it through the collimate lens. Reflected light from the measuring object is incident to the spatial filter through the objective lens for detecting the incidence position of the reflected light. A distance measuring circuit calculates contiuously the distance (d) between the objective lens and the measuring object by optical triangulation based on the output signal from the spatial filter. The frequency detecting circuit is connected to the spatial filter. When the sought running speed is V, the pitch between each equivalent light receiving element p, and the magnification of the optical image of the measuring object M, the frequency detecting circuit measures the frequency f which is given by the formula of F=MV/p. The calculator calculates the velocity V based on the output signal from the distance measuring circuit and on the output signal from the frequency detecting circuit.

REFERENCES:
patent: 3994583 (1976-11-01), Hutchins
patent: 4130360 (1978-12-01), Courtenay
patent: 4273430 (1981-06-01), Fritsche et al.
patent: 4329047 (1982-05-01), Kikuchi et al.
patent: 4634878 (1987-01-01), Fricke
patent: 4696567 (1987-09-01), Ruger et al.
patent: 4725136 (1988-02-01), McCullough et al.

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