Depth and distance measuring system

Details Depth and distance measuring system Depth and distance measuring system

1989-12-18

1991-02-19

Hellner, Mark

Optics: measuring and testing

Range or remote distance finding

With photodetection

354163, G01C 308

Patent

active

049938304

ABSTRACT:
Apparatus for determining the relative distance or depth to an object. A light source projects light at an object whose distance is to be determined. A lenticular prismatic screen responds to light reflected from the object and generates two distinct images thereof. Imaging optics focuses the two images generated by the lenticular prismatic screen onto a sensor which detects and digitizes the images. A computer is coupled to the sensor that determines the separation between the two images, which separation is indicative of the distance to or depth of the object. The computer may also compute the centroid of each of the images to more accurately determine the separation between them, and hence the distance to the object. The lenticular screen may use prismatic surfaces that are essentially equilateral triangles, or constant angle prisms across the material. Alternatively, the screen may comprise a cylindrical Fresnel lens whose prism angle continually varies as a function of the off axis distance from the center of the screen. Furthermore, a screen having different vertex angles may be formed to create custom measurement results.

REFERENCES:
patent: 4371261 (1983-02-01), Tsuji
patent: 4579450 (1986-04-01), Nagoaka et al.
patent: 4647193 (1987-04-01), Rosenfeld
patent: 4787739 (1988-11-01), Gregory

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