Optics: measuring and testing – Range or remote distance finding – With photodetection
Patent
1992-07-13
1994-05-17
Hellner, Mark
Optics: measuring and testing
Range or remote distance finding
With photodetection
G01C 308
Patent
active
053132610
ABSTRACT:
In a laser beam X-Y scanning system for use, as for example, in turbid media such as sea water; the laser light reflected from objects is received by an image receiving device or detector such as a photomultiplier tube (PMT). The intensity level of the reflected light is maintained at an intensity level within the dynamic range of the image receiving device by controlling the effective intensity of the laser beam by varying the density of a plurality of series positioned variable neutral density filters positioned between the laser beam generator and the object to be illuminated or the illuminated object and the image receiving device. The light density of each filter is determined by real time environmental conditions and the instantaneous position of the laser light source relative to the object from which the laser light is reflected to the image receiver. The density of each of the plurality of filters is controlled by a computer.
REFERENCES:
patent: 4707128 (1987-11-01), Coles
patent: 4829172 (1989-05-01), Miller
patent: 4963024 (1990-10-01), Ulich
patent: 5068540 (1991-11-01), Tsuji
Bratton Raymond H.
Leatham James G.
Applied Remote Technology Inc.
Duncan John R.
Gilliam Frank D.
Hellner Mark
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