Method of inspecting an object with a camera probe

• US 10,260,856 B2
• Filed: 10/02/2014
• Issued: 04/16/2019
• Est. Priority Date: 10/03/2013
• Status: Active Grant

• Current Assignee: Renishaw PLC
• Original Assignee: Renishaw PLC
• Inventors: Featherstone, Timothy Charles
• Primary Examiner(s): Rao, Anand S
• Application Number:
  US15/025,418
• Publication Number:
  US 20160238373A1
• Time in Patent Office: 1,657 Days
• Field of Search: 348 80-110, 348125-145
• CPC Class Codes: G01B 11/005 coordinate measuring machines
• CPC Class Codes: G01B 11/24 for measuring contours or curvatures
• CPC Class Codes: G01B 21/047 Accessories, e.g. for positioning, for tool-setting, for measuring probes
• CPC Class Codes: G01N 21/8806 Specially adapted optical and illumination features
• CPC Class Codes: G01N 21/954 Inspecting the inner surface of hollow bodies, e.g. bores
• CPC Class Codes: G05B 2219/37063 Controlled scanning, the head is moved along a given path
• CPC Class Codes: G05B 2219/37199 Hole location
• CPC Class Codes: G05B 2219/37572 Camera, tv, vision
• CPC Class Codes: H04N 7/183 for receiving images from a single remote source

Abstract

A method of inspecting an object with a camera probe for capturing an image of an object, the camera probe being movable along a path by a measurement apparatus, at least a part of the camera probe being rotatable about at least one axis. The method includes: a) the measurement apparatus moving the camera probe relative to the object along an inspection path and b) for at least one period as the camera probe moves along the inspection path: turning at least a part of the camera probe about the at least one axis thereby slowing the passage of a feature of interest on the object across the camera probe'"'"'s field of view; and capturing at least one image of the feature of interest during at least a portion of the turning.

Claims

1. A method of measuring an object with a camera probe for capturing an image of an object, the camera probe and object being movable relative to each other by a measurement apparatus comprising a coordinate positioning machine, at least a part of the camera probe being rotatable about at least one axis, the method comprising:

a) the measurement apparatus moving the camera probe and the object relative to each other; and

b) for at least one period during said relative movement turning at least a part of the camera probe about the at least one axis thereby slowing the passage of a feature of interest to be measured on the object across the camera probe'"'"'s field of view, and capturing at least one image of the feature of interest during at least a portion of said turning.

2. A method as claimed in claim 1, in which at least a part of the measurement apparatus is rotatable about at least one axis, the camera probe being rotated by the measurement apparatus about the at least one axis.

3. A method as claimed in claim 1, comprising capturing at least one image of the feature of interest at a predetermined relative position between the camera and feature of interest.

4. A method as claimed in claim 3, comprising turning at least a part of the camera probe about the at least one axis at least one of before and after the predetermined relative position.

5. A method as claimed in claim 1, comprising capturing a plurality images of the predetermined feature of interest whilst at least a part of the camera probe turns about the at least one axis.

6. A method as claimed in claim 1, in which during such turning the feature of interest is kept within the camera probe'"'"'s field of view.

7. A method as claimed in any claim 6, in which during such turning the feature of interest is kept substantially laterally stationary within the camera probe'"'"'s field of view.

8. A method as claimed in claim 1, in which the camera probe is moved relative to the feature of interest so as to keep the feature of interest within the camera probe'"'"'s depth of field during such turning.

9. A method as claimed in claim 1, in which the camera probe'"'"'s optical axis leads the camera probe as the camera probe and feature of interest at least one of approaches and trails the camera probe after the camera probe and the feature of interest have passed each other.

10. A method as claimed in claim 1, in which such turning comprises, controlling the camera probe such that the camera probe pivots about a point in the camera probe'"'"'s depth of field.

11. A method as claimed in claim 1, comprising for each of a plurality of predetermined features of interest on the object, the measurement apparatus turning at least a part of the camera probe about the at least one axis, thereby slowing the passage of the predetermined feature of interest past the camera probe'"'"'s field of view, and capturing at least one image of the predetermined feature of interest.

12. A method as claimed in claim 1, in which the predetermined feature of interest comprises a bore.

13. A method as claimed in claim 1, comprising using the at least one image, and position data obtained from the measurement apparatus regarding the position of the camera probe at the point the at least one image was obtained in order to obtain measurement data concerning the feature of interest.

16. A computer program code comprising instructions which when executed by a controller of a measurement apparatus causes the measurement apparatus to operate in accordance with the method of claim 1.

17. A computer storage medium comprising computer program code which when executed by a controller of a measurement apparatus causes the measurement apparatus to operate in accordance with the method of claim 1.

19. A method as claimed in claim 1, wherein capturing at least one image of the feature of interest during a portion of said turning comprises capturing at least one image of the feature of interest over a duration of time.

14. A method of inspecting an object with a camera probe which move relative to each other during the capturing of an image of a feature of interest of the object, the method comprising turning at least a part of the camera probe so as to counter the relative motion and so that the camera probe tracks the feature of interest during the capturing of the image of the feature of interest.

15. A method of capturing at least one image of each of a plurality of features of interest on an object with a camera probe which move relative to each other during image capture, comprising for each of said plurality of features of interest on the object the measurement apparatus turning at least a part of the camera probe during image capture, thereby slowing the passage of the feature of interest being captured past the camera probe'"'"'s field of view.

18. An apparatus for measuring an object comprising a camera probe mounted on a measurement apparatus comprising a coordinate positioning machine, at least a part of the camera probe being rotatable about at least one axis, the apparatus comprising a controller which is configured to control the measurement apparatus so as to move the camera probe and object relative to each other, and, for at least one period during said relative movement turn said at least a part of the camera probe about the at least one axis thereby slowing the passage of a feature of interest to be measured across the camera probe'"'"'s field of view, and configured to control the camera probe so as to capture at least one image of the feature of interest during at least a portion of such turning.