Optics: measuring and testing – Range or remote distance finding – With photodetection
Reexamination Certificate
2006-05-16
2006-05-16
Tarcza, Thomas H. (Department: 3662)
Optics: measuring and testing
Range or remote distance finding
With photodetection
Reexamination Certificate
active
07046345
ABSTRACT:
An apparatus for precise distance measurement has a multiple frequency generator, a laser transmitter, an optical receiver, a first measuring unit, a second measuring unit and a central processing unit. The laser transmitter outputs a light signal to a target, and the optical receiver receives the reflected light signal and mixes the base frequency signal from the multiple frequency generator and the reflected light signal and further outputs an measurement signal to the first and second measuring units. The first and second measuring units calculate respectively a time difference and a phase difference between the light signal and the reflected light signal. The central processing unit is connected to the first and second measuring units to calculate a precise distance by the time and the phase difference.
REFERENCES:
patent: 5075878 (1991-12-01), Ohtomo et al.
patent: 5955671 (1999-09-01), Gilmore et al.
patent: 6233444 (2001-05-01), Nakanishi
patent: 6255858 (2001-07-01), Akiyama et al.
Chien Pie-Yau
Duan Dan
Huang Dong
Yang Kuo-Hua
Asia Optical Co. Inc.
Dellett & Walters
Ratcliffe Luke
Tarcza Thomas H.
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