Method for the determination of the 3D coordinates of an object

• US 8,502,991 B2
• Filed: 07/08/2010
• Issued: 08/06/2013
• Est. Priority Date: 07/08/2009
• Status: Active Grant

• Current Assignee: Carl Zeiss Optotechnik GmbH (Carl-Zeiss-Stiftung)
• Original Assignee: Steinbichler Optotechnik GmbH (Carl-Zeiss-Stiftung)
• Inventors: Daxauer, Herbert, Mayer, Thomas, Thamm, Christian
• Primary Examiner(s): Punnoose, Roy M
• Application Number:
  US12/832,528
• Publication Number:
  US 20110007326A1
• Time in Patent Office: 1,125 Days
• Field of Search: 356/601, 356/620
• US Class Current: 356/620
• CPC Class Codes: G01B 11/002 for measuring two or more coordinates
• CPC Class Codes: G01B 21/045 Correction of measurements G01B9/02055 takes precedence

Abstract

A method serves for the determination of the 3D coordinates of an object. An improved method of this kind is characterized in that the object is surrounded by a plurality of reference probes having coded reference marks; and in that a plurality of shots are taken of the object such that a part of the object and a part of a reference probe is in each case included thereon.

Claims

1. A method for the determination of the 3D coordinates of an object, comprising the steps of:

surrounding the object by a plurality of reference probes having coded reference marks, the reference probes being unconnected the object; and

taking a plurality of shots of the object such that a part of the object and a part of a reference probe are in each case included thereon; and

determining the 3D coordinates of the object based on reference marks included in at least one of the plurality of shots.

2. A method in accordance with claim 1, wherein some or all of the reference probes are longer than the measurement field of the 3D sensor.

3. A method in accordance with claim 1, wherein some or all of the reference probes are of bar shape.

4. A method in accordance with claim 1, wherein shots which include at least an end of a reference probe, include at least an end of a further reference probe.

5. A method in accordance with claim 1, wherein the reference marks are automatically decoded.

6. A method in accordance with claim 1, wherein some or all of the shots are linked to one another by a 3D matching process.

7. A method in accordance with claim 1, wherein coded reference marks are also provided on the rear sides of some or all of the reference probes.

8. A method in accordance with claim 1, wherein the positions of the reference marks are detected and saved in a first measurement run.

9. A method in accordance with claim 1, wherein further measurement runs are carried out on the basis of stored positions of the reference marks.

10. A method in accordance with claim 2, wherein some or all of the reference probes are of bar shape.

11. A method in accordance with claim 10, wherein shots which include at least an end of a reference probe, include at least an end of a further reference probe.

12. A method in accordance with claim 2, wherein shots which include at least an end of a reference probe, include at least an end of a further reference probe.

13. A method in accordance with claim 3, wherein shots which include at least an end of a reference probe, include at least an end of a further reference probe.

14. A method in accordance with claim 13, wherein the reference marks are automatically decoded.

15. A method in accordance with claim 12, wherein the reference marks are automatically decoded.

16. A method in accordance with claim 11, wherein the reference marks are automatically decoded.

17. A method in accordance with claim 10, wherein the reference marks are automatically decoded.

18. A method in accordance with claim 4, wherein the reference marks are automatically decoded.

19. A method in accordance with claim 3, wherein the reference marks are automatically decoded.

20. A method in accordance with claim 2, wherein the reference marks are automatically decoded.