Optics: measuring and testing – Range or remote distance finding – With photodetection
Reexamination Certificate
2007-12-11
2011-12-27
Tarcza, Thomas (Department: 3662)
Optics: measuring and testing
Range or remote distance finding
With photodetection
C356S004010, C356S005100, C356S005150
Reexamination Certificate
active
08085388
ABSTRACT:
A 3D pulsed laser projection system scans an object to produce a dense 3D point cloud and projects a laser light beam onto an object as a glowing template. A high-sensitivity optical feedback system receives and detects a feedback beam of the output beam light diffusely reflected from the object. The feedback light and projected beam share the same beam path between steering mirrors and the object. A light suppression component controls stray scattered light, including ambient light, from being detected. A time-of-flight measurement subsystem provides a distance-to-object measurement for projected pulses. An acousto-optical modulator, variable gain detected signal amplification and variable photo-detector power together produce a dynamic range for detected reflected feedback signals of at least 100,000, and up to 500,000. Optical fiber cables spatially filter scattered light and isolate the photo-detectors thermally. The laser is preferably pulsed at least 50 kHz, with sampling of the projected and feedback reflected optical pulse signals at a sampling rate of up to 10 gigasamples per second.
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Chagaris Christopher C.
Kaufman Steven P.
Savikovsky Arkady
Stave Joel
Finch & Maloney PLLC
Laser Projection Technologies, Inc.
Ratcliffe Luke
Tarcza Thomas
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