Single laser beam measurement system
First Claim
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1. A laser measurement system for determining the difference between the actual three-dimensional configuration of a vehicle frame requiring repair and the normal three-dimensional configuration of the vehicle frame as defined by the manufacturer to determine the extent of deformation of the vehicle frame and the necessary repairs required to the vehicle frame, the system comprising:
- a rotating laser scanner having a single scanning laser beam having a known constant speed of rotation and a reference position;
the scanner further including detection optics for detecting reflected light from the laser beama plurality of retro-reflective targets each having a target face with a known target width, a known pattern of slanted retro-reflective stripes on the target face, retro-reflective stripes at the vertical edges of the target face to denote its width, and mean for attachment the target to the vehicle frame at a give reference point having a corresponding normal reference point value as defined by the manufacturer,wherein the time interval between light reflected by the retro-reflective stripes at the vertical edges of the target is sensed by the scanner detection optics to determine the time it takes the scanning laser beam to traverse the known width of the target face to provide distance position data for each target;
wherein the time interval between light reflected by the slanted retro-reflective stripes is sensed by the scanner detection optics to determine vertical position data of the laser scanning beam on the target face;
wherein the time interval between the scanner reference position and light reflected from each target is sensed to determine the angular position of each target relative to the scanner reference position; and
wherein each target face is cylindrically shaped;
positioning means for positioning each target within view of the scanning laser beam at a known vertical distance from the associated reference point; and
means for receiving position data from all the targets to determine an actual position of each reference point relative to a normal position of the reference point as determined by the manufacturer'"'"'s specifications.
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Abstract
A single laser beam measurement system employing retro-reflective striped targets is disclosed having an error correction mechanism which compensates for errors arising from the target not being square to a laser scanning beam.
4 Citations
13 Claims
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1. A laser measurement system for determining the difference between the actual three-dimensional configuration of a vehicle frame requiring repair and the normal three-dimensional configuration of the vehicle frame as defined by the manufacturer to determine the extent of deformation of the vehicle frame and the necessary repairs required to the vehicle frame, the system comprising:
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a rotating laser scanner having a single scanning laser beam having a known constant speed of rotation and a reference position;
the scanner further including detection optics for detecting reflected light from the laser beama plurality of retro-reflective targets each having a target face with a known target width, a known pattern of slanted retro-reflective stripes on the target face, retro-reflective stripes at the vertical edges of the target face to denote its width, and mean for attachment the target to the vehicle frame at a give reference point having a corresponding normal reference point value as defined by the manufacturer, wherein the time interval between light reflected by the retro-reflective stripes at the vertical edges of the target is sensed by the scanner detection optics to determine the time it takes the scanning laser beam to traverse the known width of the target face to provide distance position data for each target; wherein the time interval between light reflected by the slanted retro-reflective stripes is sensed by the scanner detection optics to determine vertical position data of the laser scanning beam on the target face; wherein the time interval between the scanner reference position and light reflected from each target is sensed to determine the angular position of each target relative to the scanner reference position; and wherein each target face is cylindrically shaped; positioning means for positioning each target within view of the scanning laser beam at a known vertical distance from the associated reference point; and means for receiving position data from all the targets to determine an actual position of each reference point relative to a normal position of the reference point as determined by the manufacturer'"'"'s specifications. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A laser measurement system for determining the three-dimensional position of a target in space, the system comprising:
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a rotating laser scanner having a single scanning laser beam having a known constant speed of rotation and a reference position;
the scanner further including detection optics for detecting reflected light from the laser beama plurality of retro-reflective targets each having a target face with a known target width, a known pattern of slanted retro-reflective stripes on the target face, retro-reflective stripes at the vertical edges of the target face to denote its width, and mean for positioning the target in three-dimensional space, wherein the time interval between light reflected by the retro-reflective stripes at the vertical edges of the target is sensed by the scanner detection optics to determine the time it takes the scanning laser beam to traverse the known width of the target face to provide distance position data for each target; wherein the time interval between light reflected by the slanted retro-reflective stripes is sensed by the scanner detection optics to determine vertical position data of the laser scanning beam on the target face; wherein the time interval between the scanner reference position and light reflected from each target is sensed to determine the angular position of each target relative to the scanner reference position; and wherein each target face is cylindrically shaped; positioning means for positioning each target within view of the scanning laser beam; and means for receiving position data from all the targets to determine an actual position each target in three dimensional space. - View Dependent Claims (10, 11, 12, 13)
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Specification
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Current AssigneeAdvanced Measurement Systems, Inc.
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Original AssigneeAdvanced Measurement Systems, Inc.
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InventorsHanchett, Mike, Hartl, James
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Primary Examiner(s)NGUYEN, TU T
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Application NumberUS12/925,700Publication NumberTime in Patent Office763 DaysField of SearchNoneUS Class Current356/625CPC Class CodesG01B 11/2518 Projection by scanning of t...G01B 11/272 using photoelectric detecti...
