Coded aperture light detector for three dimensional camera

Details Coded aperture light detector for three dimensional camera Coded aperture light detector for three dimensional camera

1987-11-23

1989-05-16

Buczinski, Stephen C.

Optics: measuring and testing

Range or remote distance finding

With photodetection

250227, G01C 300, G01C 500

Patent

active

048304859

ABSTRACT:
High speed readout is achieved in a triangulation ranger by a coded aperture light detector which provides a direct digital representation of a range or height position. A light spot reflected from the surface is optically spread into a line segment so it can be shared among a number of light detection channels. The line of light falls on a coded aperture in front of a segmented fiber optic bundle and the light transmitted by each channel is led to a separate photomultiplier or solid state detector. Every coded channel is constructed to give one bit of the digital address of the range position, and a reference light value is obtained from another channel. Background and secondary reflections may be filtered out by focusing light scattered from the surface to a spot and passing it through a slit aperture oriented in the plane of triangulation before being spread to a line segment.

REFERENCES:
patent: 3555285 (1971-01-01), Irving
patent: 3858201 (1974-12-01), Foster
patent: 4150897 (1979-04-01), Roberts et al.
patent: 4200787 (1980-04-01), Carson
patent: 4277170 (1981-07-01), Miles
patent: 4317991 (1982-03-01), Stauffer
patent: 4645917 (1987-02-01), Penney et al.
patent: 4687325 (1987-08-01), Corby, Jr.
patent: 4687326 (1987-08-01), Corby, Jr.

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