Apparatus for generating detecting and characterizing a raster i

Details Apparatus for generating detecting and characterizing a raster i Apparatus for generating detecting and characterizing a raster i

1988-02-16

1989-08-22

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

356387, G01N 2186

Patent

active

048598623

ABSTRACT:
A device for generating, detecting, and characterizing a raster image of the contour of an object, wherein a narrow concentrated light beam (1) is emitted towards a light beam deflector means (3) causing said light beam (1) to sweep repeatedly across a plane (19) through which the object is guilded, and where the light beams not screened by said object are received, and are opto-electrically transformed into electrical signals, e.g. pulse trains which are characteristic of the incremental portions of a raster image of said object, said signals being processed to yield a characteristic expression of the contour of said object. A retro-reflector (5;32) is placed in such a manner that light beams (10) not screened by said object are reflected back across said plane (19) at a second angle of scattering which is equal to or larger than said first angle of scattering, and a detector (11) receives the reflected light beams (10) and transforms them into said signals, preferably for forming a successive pulse train. When a continuous light beam is used the retro-reflector is provided with a plurality of narrow non-reflecting and mutually stripes (6) across the retro-reflector (5). When a pulsed light beam is used a nontreated retro-reflector (32) is used. The plane across which the light beam (1) sweeps may be caused to oscillate in which case a two-dimensional raster image of the contour of the object is formed.

REFERENCES:
patent: 3744915 (1973-07-01), Sick
patent: 4025796 (1977-05-01), Erdmann
patent: 4402609 (1983-09-01), Fetzer et al.

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