Optics: measuring and testing – Range or remote distance finding – With photodetection
Patent
1998-10-14
2000-06-06
Buczinski, Stephen C.
Optics: measuring and testing
Range or remote distance finding
With photodetection
348 31, 359353, G01C 308, H04N 700, H01J 3150
Patent
active
060725656
ABSTRACT:
An integrated night vision device and laser range finder (10) provides night-time imaging of a scene by use of an image intensifier tube (14), as well as providing laser range finding operations. In a laser range finder mode of operation the device (10) projects a pulse of laser light into a scene being viewed, and a power supply and laser range finder circuit (50) of the device (10) temporarily utilizes the image intensifier tube (14) as a sensor to detect reflected laser light. During laser range finding, imaging is cut off for a very short time interval, and the image intensifier tube provides an electrical output signal in response to receipt of reflected laser light. A detection circuit (86, 86') associated with the image intensifier tube (10) receives the electrical output signal from the image intensifier tube (14), and includes a magnetic circuit. Oscillation in the magnetic circuit is effected by the electrical output signal of the image intensifier tube (14). A frequency comparator circuit, or phase detector circuit provides an electrical timer-stop output signal in response to a change in a frequency or phase relationship, respectively, of oscillations in the magnetic circuit.
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Buczinski Stephen C.
Litton Systems Inc.
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