Optics: measuring and testing – Range or remote distance finding – With photodetection
Patent
1998-09-08
2000-09-05
Buczinski, Stephens C.
Optics: measuring and testing
Range or remote distance finding
With photodetection
356 401, 356380, 356386, G01C 308, G01B 1128, G01B 1110
Patent
active
061151149
ABSTRACT:
A laser scanner sensor for measuring the spatial properties of objects in a scene within a range less than a predetermined maximum object distance. Applications of the laser scanner system includes measurement of the dimensional weight of parcel(s) being transported by a moving forklift. In the laser scanner sensor, a laser diode supplies a laser beam that is intensity-modulated by a reference waveform from a waveform generator. A variation of the optical scanning sensor system scans a field of measurement which the moving forklift traverses. The forklift has at least three retroreflectors attached to act as calibration targets within the viewing field. The scanner system intensity-modulates the laser beam, and receives reflected intensity-modulated light and supplies it to an optical processing system that includes an aperture that transmits a first percentage of light reflected from the maximum object distance and a second, lesser percentage of light reflected from objects closer than the maximum object distance. A photodetector receives the processed light and converts the energy into an amplitude-modulated range signal. Range values are then determined about every 0.1-inches along a scan line. A number of scan lines are assembled in the computer and displayed on a screen as a 3-D image. The 3-D image is then analyzed by the computer to extract the volume of the objects carried on the forklift tines. The volume is then converted to Dimensional Weight (DIM WT) which is used by the shipper to determine tare.
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Berg Johnny L.
Gerhard Francis H.
Buczinski Stephens C.
Holometrics Inc.
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