Optics: measuring and testing – Range or remote distance finding – With photodetection
Reexamination Certificate
2005-04-05
2005-04-05
Tarcza, Thomas H. (Department: 3662)
Optics: measuring and testing
Range or remote distance finding
With photodetection
C356S005100
Reexamination Certificate
active
06876441
ABSTRACT:
Apparatus and method are provided for distance measurement to a remote surface using high frequency modulated transmitted and reflected laser beams and phase-shift calculations. To improve phase-shift resolution, the reflected bean is further modulated, before detection, at a high frequency similar yet different from that of the transmitted beam so as create a resulting detector signal having at least a lower frequency signal which is easily detected by a response limited detector. The lower frequency signal retains the phase-shift information and thus enables determination of the phase-shift information with stable, inexpensive low-frequency optical detectors. Three-dimensional mapping can performed wherein one or more apparatus employ a plurality of detectors or a scanner producing a plurality of sequential reflected beams, each of which results in a plurality of phase-shift information for an area on the surface.
REFERENCES:
patent: 3547539 (1970-12-01), Froome et al.
patent: 3680101 (1972-07-01), Granqvist
patent: 4340299 (1982-07-01), Mongeon
patent: 4715706 (1987-12-01), Wang
patent: 4759623 (1988-07-01), Meier
patent: 4856893 (1989-08-01), Breen
patent: 4916324 (1990-04-01), Meier
patent: 5194907 (1993-03-01), Hayashi
patent: 5715044 (1998-02-01), Hayes
patent: 5764360 (1998-06-01), Meier
patent: 6100540 (2000-08-01), Ducharme et al.
Andrea Brian K
Eagle Ray Corporation
Goodwin Sean W.
Tarcza Thomas H.
Thompson Linda M.
LandOfFree
Optical sensor for distance measurement does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Optical sensor for distance measurement, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Optical sensor for distance measurement will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-3417307