Laser measurement system

• US 7,181,856 B1
• Filed: 11/09/2005
• Issued: 02/27/2007
• Est. Priority Date: 11/09/2005
• Status: Active Grant

• Current Assignee: Advanced Measurement Systems, Inc., Dylanway, LLC
• Original Assignee: Darryl W. Koop, Jim C. Hartl, Michael T. Hanchett, Robin L. Knoke, Roy E. Lawton
• Inventors: Knoke, Robin L., Koop, Darryl W., Hanchett, Michael T., Lawton, Roy E., Hartl, Jim C.
• Primary Examiner(s): BENNETT, GEORGE B
• Application Number:
  US11/269,924
• Time in Patent Office: 475 Days
• Field of Search: 332/86, 332/88, 332/90, 332/93, 332/94, 336/00, 336/13, 336/45, 33D/IG.21, 356/138, 356/153, 356/152.1
• US Class Current: 33/288
• CPC Class Codes: G01B 5/0025 Measuring of vehicle parts G01B5/003 takes precedence
• CPC Class Codes: G01C 15/002 Active optical surveying means optical plumbing G01C15/105
• CPC Class Codes: G01C 15/006 Detectors therefor
• CPC Class Codes: G01S 11/12 using electromagnetic waves other than radio waves
• CPC Class Codes: G01S 3/789 using rotating or oscillating beam systems, e.g. using mirrors, prisms
• CPC Class Codes: G01S 7/003 Transmission of data between radar, sonar or lidar systems and remote stations
• CPC Class Codes: Y10S 33/21 with laser

Abstract

A laser measurement system indicates the difference between an actual position of a vehicle frame reference point on a vehicle frame and a normal position employing a rotating laser scanner; an electro-optical detector and a host computer. A positioning arrangement is also provided for positioning the electro-optical detector at a known distance from the reference point. In operation, the host computer queries the scanner and detector via a communication link, calculates the actual position of the reference point, and displays the difference between the position of the vehicle reference point on the vehicle frame and the normal position.

Claims

1. A vehicle frame 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 pair of substantially parallel laser beams separated by a known distance and rotating in unison at a known speed of rotation around an axis of rotation and synchronization pulse light emitters for broadcasting a synchronization pulse when the pair of substantially parallel laser beams are at a known reference angle;

a plurality of active targets each for attachment to the vehicle frame at a give reference point having a corresponding normal reference point value as defined by the manufacturer, each active target detecting position data comprising the synchronization pulse, the time of detection of the laser beams relative to one another and the synchronization pulse, a vertical position of the laser beams on the active target and including storage means storing the position data;

positioning means for positioning each active target within view of the scanning laser beams and the synchronization pulse emitted by the laser scanner and at a known vertical distance from the associated reference point which is communicated to the associated active target and stored by the storage means with the position data;

a host computer for receiving position data from the active 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 and for displaying the frame and the differences between the actual and the normal positions of the reference points of the frame to illustrate the degree of deformation of the actual configuration of the frame and to visually indicate the repairs needed to restore the frame to its normal configuration; and

a communication link by which the host computer at least receives position information from the plurality of active targets communicate with one another.

2. A vehicle frame measurement system according to claim 1, wherein the host computer further includes means for preparing a report including the repairs needed to the frame.

3. A vehicle frame measurement system according to claim 2, wherein the system further includes means for providing the report to recipients including an insurance company.

4. A vehicle frame measurement system according to claim 1, wherein each of the active targets include indicators which indicate the degree of difference between the actual position of the vehicle reference point to which the active target is attached and the normal position thereof as defined by manufacturer.

5. A vehicle frame measurement system according to claim 4, wherein the indicators on the active targets also indicate which direction the vehicle reference point needs to be moved in order to occupy it'"'"'s normal position.

6. A vehicle frame measurement system according to claim 1, wherein each active target transmits to the host computer position data that includes:

1) the known vertical distance received from the positioning means and the vertical positions of each of the laser beams detected on that detector,

     2) the vertical position of detection of the laser beams on the active target, and

     3) the difference in the average time of detection of the laser beams at the active target in relation to one another and the time of detection of the broadcast of the synchronization pulse.

7. A vehicle frame measurement system according to claim 6, wherein, using the speed of rotation and distance of separation of the scanning laser beams and the position data from the active targets, the host computer computes the radial position and distance to the center point of detection of each of the active targets from the axis of rotation of the scanner and the vertical positions of the active targets below their corresponding reference points to calculate the actual position of each reference point on the frame in relation to the normal position and display the difference.

8. A vehicle measurement system according to claim 7, wherein the laser scanner has a tilt sensor, the output of which are communicated to the host computer which include means for compensating for the difference in tilt between the laser scanner and the vehicle frame when calculating the position of the vehicle reference point relative to the scanner reference position.

9. A vehicle measurement system according to claim 1, wherein each active target includes detection means comprising a height and position photo-detector cell for detecting the arrival of and vertical position of the laser beams at the detector target and a synchronization pulse detector for detecting the synchronization pulse.

10. A vehicle measurement system according to claim 9, wherein the synchronization pulse detector is a bi-cell photodiode.

11. A laser measurement system for indicating the differences between an actual position of a vehicle frame reference points on a vehicle frame and normal positions thereof, the system comprising:

a rotating laser scanner having an axis of rotation positioned at a scanner reference point, the scanner having;

     1) means for generating a pair of substantially parallel, scanning laser beams separated by a known distance and rotating at a constant speed of rotation around the scanner reference point and,

     2) an array of light emitters for broadcasting a synchronization pulse when the pair of substantially parallel laser beams are at a known reference angle;

active targets for attachment to vehicle frame reference points, each active target having;

     1) detection means for detecting the synchronization pulse, an arrival of the laser beams at the detector and a vertical position of the laser beams on the detector,

     2) processing and storage means for time stamping and for storing the detection times of the laser beams relative to one another and the synchronization pulse and the vertical position of the laser beams on the detector;

positioning means, having a known length, for attaching each active target at a known vertical distance from a reference point and for communicating the known vertical distance to the associated active target for storage;

a host computer, capable of communicating with at least the active targets, the host computer including;

a) storage means for storing the normal positions of the reference points;

b) calculating means for calculating the actual positions of each of the vehicle reference points based on data received from active targets;

c) comparison means for comparing the actual positions of the each of the vehicle reference points with the normal positions thereof to determine a difference there between;

d) display means for illustrating the difference between the actual position of each of the vehicle reference points on the vehicle frame and their normal positions, and

a communication link by which the host computer communicates with each active target.

12. A laser measurement system according to claim 11, wherein the laser scanner communicates with the host computer via the communication link;

and wherein the laser scanner includes a tilt sensor, the output of which are communicated to the host computer which include means for compensating for the difference in tilt between the laser scanner and the vehicle frame when calculating the position of the vehicle reference point relative to the scanner reference position.

13. A laser measurement system according to claim 11, wherein detection means of the active target comprise a height and position photo-detector cell for detecting the position of and arrival of the laser beams at the detector and a synchronization pulse detector for detecting the synchronization pulse.

14. A laser measurement system according to claim 13, wherein the synchronization pulse detector is a bi-cell photodiode.

15. A laser measurement system according to claim 13, wherein the height and position photo-detector cell is Position Sensing Detector.

16. A laser measurement system according to claim 13, wherein the active target further includes a connection means for connecting the active target to the positioning means.

17. A laser measurement system according to claim 16, wherein the connection means is adapted to permit the active target to hang plumb under the influence of gravity from the vehicle reference point.

18. A laser measurement system according to claim 16, wherein the positioning means include means for communicating the known vertical distance of the target from the reference point to the host computer.

19. A laser measurement system according to claim 16, wherein the positioning means includes means for communication the known vertical distance of the target from the reference point to the process and storage means of the active target for transmittal to the host computer.

20. A laser measurement system according to claim 11, wherein each of the active targets further include an indicator for indicating the degree of difference between the position of the associated vehicle reference point on the vehicle frame and the normal position.