Six dimensional laser tracking system and method

• US 20030043362A1
• Filed: 08/22/2002
• Published: 03/06/2003
• Est. Priority Date: 08/22/2001
• Status: Abandoned Application

• Current Assignee: Automated Precision Inc.
• Original Assignee: Automated Precision Inc.
• Inventors: Lau, Kam C.
• Application Number:
  US10/225,134
• Publication Number:
  US 20030043362A1
• Time in Patent Office: Days
• US Class Current: 356/4.09
• CPC Class Codes: G01C 15/00 Surveying instruments or accessories not provided for in groups G01C1/00 - G01C13/00
• CPC Class Codes: G01S 17/74 Systems using reradiation of electromagnetic waves other than radio waves, e.g. IFF, i.e. identification of friend or foe
• CPC Class Codes: G01S 5/163 Determination of attitude using inertial means G01C9/00; control of attitude G05D1/49
• CPC Class Codes: G01S 7/499 using polarisation effects

Abstract

A laser based tracking unit communicates with a target to obtain position information about the target. Specifically, the target is placed at the point to be measured. The pitch, yaw and roll of the target, and the spherical coordinates of the target relative to the tracking unit are the obtained. The target can be, for example, an active device incorporated into a moveable device such a remote controlled robot.

Claims

1. A multi-dimensional measurement system comprising:

a tracking unit that emits a laser and has spherical coordinates;

a target in communication with the tracking unit, the target having a pitch, a yaw and a roll;

a distance determining module that determines a distance between the tracking unit and the target; and

an output device that outputs position information about the target relative to the tracking unit based on the pitch, yaw, roll and spherical coordinates.

2. The system of claim 1, further comprising an output module that outputs the position information about the target.

3. The system of claim 1, wherein the roll is based on at least one of a comparison between a horizontally polarized and a vertically polarized portion of the laser and an electronic level.

4. The system of claim 3, further comprising a first photodetector that detects the horizontally polarized portion of the laser and a second photodetector that detects the vertically polarized portion of the laser.

5. The system of claim 4, further comprising a differential amplifier that receives an output of the first photodetector and an output of the second photodetector.

6. The system of claim 1, wherein the target is an active target that is capable of moving relative to the laser.

7. The system of claim 6, wherein the active target is at least one of incorporated into a robotic device, fixably attached to an object, used for feedback control, used for calibration, used for machine tool control, used for parts assembly, and used for structural assembly.

8. The system of claim 7, wherein the robotic device comprises a drive system and one or more traction devices that allow the robotic device to adhere to a surface.

9. The system of claim 8, wherein the traction devices are suction cup type devices.

10. The system of claim 7, further comprising a vacuum system.

11. The system of claim 7, wherein the robotic device is remotely controlled.

12. The system of claim 7, further comprising on or more accessories that allow a function to be performed based at least on the position of the target.

13. A method of measuring the position of an object comprising:

monitoring spherical coordinates of a laser emitting tracking unit;

monitoring a pitch, a yaw and a roll of a target in communication with the tracking unit;

determining a distance between the tracking unit and the target; and

outputting position information about the target relative to the tracking unit based on the spherical coordinates, pitch, yaw and roll.

14. The method of claim 13, wherein the roll is based on at least one of a comparison between a horizontally polarized and a vertically polarized portion of the laser and en electronic level.

15. The method of claim 14, wherein a differential amplifier performs the comparison between the horizontally polarized and the vertically polarized portion of the laser.

16. The method of claim 13, wherein the target is an active target that is capable of moving relative to the laser.

17. The method of claim 16, wherein the active target is at least one of incorporated into a robotic device, fixably attached to an object, used for feedback control, used for calibration, used for machine tool control, used for parts assembly, and used for structural assembly.

18. The method of claim 17, wherein the robotic device comprises a drive system and one or more traction devices that allow the robotic device to adhere to a surface.

19. The method of claim 18, wherein the traction devices are suction cup type devices used in conjunction with a vacuum system

20. The method of claim 18, wherein the robotic device is remotely controlled.

21. The method of claim 17, further comprising allowing a function to be performed by an accessory based at least on the position of the target.

22. A system for measuring the position of an object comprising:

means for monitoring spherical coordinates of a laser emitting tracking unit;

means for monitoring a pitch, a yaw and a roll of a target in communication with the tracking unit;

means for determining a distance between the tracking unit and the target; and

means for outputting position information about the target relative to the tracking unit based on the spherical coordinates, pitch, yaw, and roll.

23. The system of claim 22, wherein the roll is based on at least one of a comparison between a horizontally polarized and a vertically polarized portion of the laser and an electronic level.

24. The system of claim 23, wherein a differential amplifier performs the comparison between the horizontally polarized and the vertically polarized portion of the laser.

25. The system of claim 22, wherein the target is an active target that is capable of moving relative to the laser.

26. The system of claim 25, wherein the active target is at least one of incorporated into a robotic device, fixably attached to an object, used for feedback control, used for calibration, used for machine tool control, used for parts assembly, and used for structural assembly.

27. The system of claim 26, wherein the robotic device comprises a drive system and one or more traction devices that allow the robotic device to adhere to a surface.

28. The system of claim 27 wherein the one or more traction devices are suction cup type devices used in conjunction with a vacuum system

29. The system of claim 27, wherein the robotic device is remotely controlled.

30. The system of claim 22, further comprising means for allowing a function to be performed based at least on the position of the target.