Optics: measuring and testing – Range or remote distance finding – With photodetection
Reexamination Certificate
2007-03-20
2007-03-20
Tarcza, Thomas H. (Department: 3662)
Optics: measuring and testing
Range or remote distance finding
With photodetection
C356S004010, C356S004020, C356S004030, C356S005010
Reexamination Certificate
active
10790899
ABSTRACT:
Method and device for light signal reception. This device can selectively execute a comparison mode or a gain mode. In the device, a transmitter transmits a light beam to a target. A receiver receives the light beam reflected from the target and outputs a corresponding received signal. In the comparison mode, it is determined whether a pulse in the received signal is higher than a reference voltage level. When the pulse is higher the reference voltage level, the pulse is outputted. The gain mode is executed and the received signal is amplified and output when no pulse is higher than the reference voltage level in the received signal. The method and device of the present invention can be applied to range finders, the comparison mode is executed during short-distance measurement and the gain mode is executed during long-distance measurement thereby measuring the target distance from several meters to a thousand meters.
REFERENCES:
patent: 5926260 (1999-07-01), Dunne et al.
patent: 6313464 (2001-11-01), Schrader
Chung Lung-Pin
Huang Jui-Feng
Lin Ai-Ling
Lin Ing-Song
Asia Optical Co. Inc.
Ratcliffe Luke D.
Tarcza Thomas H.
Thomas Kayden Horstemeyer & Risley
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