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
044900368
ABSTRACT:
A rangefinder device includes means for projecting a beam of light to illuminate a spot on an object in a scene, an image sensor for sensing an image of the scene, and signal processing means responsive to signals produced by the image sensor for determining the relative location of the illuminated spot in the image of the scene to determine the distance to the object. The rangefinder device features means for removing the contribution due to ambient scene illumination from the photosignals, including an improved image sensor having an array of photosensors and a pair of analog shift registers for receiving the photosignals from the array of photosensors. One of the analog shift registers receives photosignals from the photosensor array when the beam is turned off, and the other analog shift register receives photosignals from the array when the beam is turned on. The shift registers are read out simultaneously and the signals therefrom are differenced to yield a series of photosignals free from background scene information. The difference signals are supplied serially to a peak detector to determine the location of the illuminated spot. In a preferred embodiment, the rangefinder is designed to operate from a single low voltage power source.
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patent: 4410261 (1983-10-01), Masunaga et al.
Buczinski S. C.
Close Thomas H.
Eastman Kodak Company
Sotomayor John B.
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