Optics: measuring and testing – Range or remote distance finding – With photodetection
Patent
1982-08-18
1984-12-25
Buczinski, S. C.
Optics: measuring and testing
Range or remote distance finding
With photodetection
354403, G01C 310, G03B 708
Patent
active
044900376
ABSTRACT:
A rangefinder device includes means for projecting a beam of light to illuminate a small area on an object in a scene, an array of photosensors for sensing an image of the scene, and signal processing means responsive to the photosignals from the photosensors for determining the relative location of the illuminated small area in the image of the scene. The rangefinder device includes an image sensor having means for removing the contribution due to ambient scene illumination from the photosignals. The image sensor includes a plurality of photosensitive elements, comprising a photosensor, a charge storage element and a bridge network of switches arranged for selectively connecting the photosensor to the charge storage element in such a manner as to selectively add photocurrent to the storage element or to remove photocurrent from the storage element. The rangefinder device is first operated with the light beam on and the bridge networks connected to add photocurrent to the storage elements. The device is then operated with the light beam off and the bridge networks connected to remove photocurrent from the storage elements. The difference signals remaining in the storage elements are free from contributions due to ambient scene illumination.
The image sensor includes an analog shift register for receiving the difference signals in parallel from the storage elements and delivering them serially to a peak detector circuit. The peak detector circuit locates the position of the illuminated small area by sensing the maximum difference signal in a series.
REFERENCES:
patent: 3394642 (1968-07-01), Haruo Teshi et al.
patent: 4117514 (1978-09-01), Terui et al.
patent: 4173723 (1979-11-01), Temes et al.
patent: 4274735 (1981-06-01), Tamura et al.
Anagnostopoulos Constantine N.
Frank Lee F.
Buczinski S. C.
Close Thomas H.
Eastman Kodak Company
Sotomayor John B.
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