Inspection system and method

• US 6,636,581 B2
• Filed: 08/31/2001
• Issued: 10/21/2003
• Est. Priority Date: 08/31/2001
• Status: Expired due to Fees

• Current Assignee: Jetray Corporation
• Original Assignee: Jetray Corporation
• Inventors: Sorenson, Michael R.
• Primary Examiner(s): OEN, WILLIAM L
• Application Number:
  US09/944,693
• Publication Number:
  US 20030043964A1
• Time in Patent Office: 781 Days
• Field of Search: 378/57, 378/58, 378/62, 378/70-81, 378/20, 356/237, 356/237.3, 356/237.4, 250/201.3, 250/201.6, 250/559, 250/48, 250/358.1
• US Class Current: 378/58
• CPC Class Codes: G01N 23/04 and forming images of the material

Abstract

An inspection system utilized to inspect a structure for particularities, including defects, includes a first gantry with a detector inspection device that is placed in a known position on one side of the structure, and a second gantry with a source inspection device that is placed on the other side of the structure. In an embodiment, the detector inspection device is an x-ray detector inspection device and the source inspection device is an x-ray source inspection device. The movement of the first and second gantries is controlled by a gantry control system. A data acquisition system controls the data, e.g., image, collection process. During the data collection process, the relative positions of the source and detector inspection devices are initialized. The detector and source inspection devices are then moved in synchronized motion to each data collection position, such that the relative alignment of the inspection devices is maintained. In an embodiment, a programmed inspection sequence directs data collection positioning for automated coverage of the structure. In an alternative embodiment, manual positioning may be utilized. The detector and source inspection devices collect data, e.g., images, of the structure at each data collection position.

Claims

1. An inspection method for identifying particularities of a structure, the method comprising:

positioning a first inspection device inside of the structure and positioning a second inspection device outside of the structure, wherein one of the first or second inspection devices comprises a detector inspection device and the other of the first or second inspection devices comprises a source inspection device;

collecting data of at least a portion of the structure located between the first and second inspection devices;

moving the first inspection device on the inside and the second inspection device on the outside of a subsequent portion of the structure while approximately maintaining a pre-determined distance between the inspection devices; and

collecting data at the subsequent portion of the structure located between the inspection devices.

2. The inspection method of claim 1, wherein the first and second inspection devices are automatically moved to the subsequent portion of the structure according to a programmed inspection sequence that controls movement of the first and second inspection devices along the structure.

3. The inspection method of claim 2, wherein the method of producing the programmed inspection sequence that controls movement of the first and second inspection devices along the structure comprises an operator commanding the second inspection device to move through data collection positions and programming the data collection positions into the programmed inspection sequence.

4. The inspection method of claim 3, wherein the structure includes substantially similar portions, and wherein during programming of the data collection positions, data collection positions for the substantially similar portions of the structure are repeated within the inspection sequence during programming.

5. The inspection method of claim 2, wherein the method of producing the programmed inspection sequence that controls movement of the first and second inspection devices along the structure comprises an operator commanding a simulated inspection device to move through data collection positions on the structure and programming the data collection positions into the programmed inspection sequence.

6. The inspection method of claim 2, wherein the programmed inspection sequence that controls movement of the first and second inspection devices along the structure is produced from surface data of the structure generated from visual surveying equipment.

7. The inspection method of claim 2, wherein the programmed inspection sequence that controls movement of the first and second inspection devices along the structure is produced from surface model data of the structure derived from CAD data.

8. The inspection method of claim 1, wherein the source inspection device and the detector inspection device are manually moved to each portion of the structure to be imaged.

9. The inspection method of claim 1, wherein the source inspection device comprises an X-ray source and the detector inspection device comprises an X-ray detector.

10. The inspection method of claim 1, wherein the source inspection device is mounted on a first gantry and the detector inspection device is mounted on a second gantry, and wherein the first and second gantries are synchronized to move in coordinated motion with each other.

11. The inspection method of claim 10, wherein the first gantry and the second gantry each comprise one or more low power actuators.

12. The inspection method of claim 1, wherein one of the first or second gantries utilizes a track assembly, and the other of the first or second gantries utilizes a rover vehicle.

13. The inspection method of claim 1, wherein the first and second inspection devices are each initialized at home positions that provide for visual contact between the first and second inspection devices.

14. The inspection method of claim 1, wherein the structure comprises an aircraft.

15. The inspection method of claim 1, wherein the particularities that the inspection method identifies comprise cracks and corrosion.

16. An inspection method for identifying particularities in a structure, the method comprising:

placing a first gantry comprising an attached first inspection device in a position located outside of the structure;

placing a second gantry comprising an attached second inspection device inside of the structure;

initializing the relative positions of the first and second inspection devices;

moving the first and second inspection devices in a coordinated manner to each of a set of data collection positions according to a programmed inspection sequence that controls movement of the first and second inspection devices along the structure; and

collecting data of the structure at each data collection position.

17. The inspection method of claim 16, wherein the first and second gantries have axes, and wherein artificial axes are utilized that allow an operator to command the first inspection device to move in its coordinate system, rather than requiring desired motion of the first inspection device to be coordinated with respect to the first gantry axes.

18. The inspection method of claim 17, wherein the artificial axes register to an aircraft coordinate system.

19. The inspection method of claim 16, wherein reverse kinematics are utilized to derive a set of second gantry motions that achieve a sequence of data collection positions for the second inspection device corresponding to a programmed sequence of data collection positions for the first inspection device.

20. The inspection method of claim 16, wherein data collection is performed when the first and second gantries are intermittently stopped.

21. The inspection method of claim 16, wherein the structure includes substantially similar portions, and wherein during programming of the data collection positions, data collection positions for the substantially similar portions of the structure are repeated within the programmed sequence of data collection positions.

22. The inspection method of claim 16, wherein one of the first or second gantries utilizes a track assembly, and the other of the first or second gantries utilizes a rover vehicle.

23. The inspection method of claim 16, wherein the structure comprises an aircraft.

24. A method for creating an inspection sequence to use in the inspection of a structure, the method comprising:

aligning an exterior gantry having an inspection device with the structure by initializing all the axes of the exterior gantry;

determining at least three reference points at locations on the structure;

determining the location and orientation of the inspection device on the exterior gantry relative to the structure via triangulation to the reference points;

determining one or more data collection positions for the inspection device on the exterior gantry;

positioning the inspection device on the exterior gantry in an orientation to the structure at a data collection position;

recording the data collection position of the inspection device on the exterior gantry;

using reverse kinematics to derive interior gantry axes motions to achieve a data collection position for an inspection device on an interior gantry corresponding to a data collection position of the inspection device on the exterior gantry; and

recording the corresponding data collection position for the inspection device on the interior gantry.

25. The method of claim 24, wherein the inspection sequence automatically moves the inspection device on the exterior gantry to a data collection position on the structure.

26. The method of claim 24, wherein the inspection device on the exterior gantry comprises an x-ray detector and the inspection device on the interior gantry comprises an x-ray source.

27. The method of claim 24, wherein the exterior and interior gantries have axes, and wherein artificial axes are utilized that allow an operator to move the inspection device on the interior gantry in its coordinate system, rather than requiring desired motion of the inspection device on the interior gantry to be coordinated with respect to interior gantry axes.

28. The method of claim 27, wherein the artificial axes register to an aircraft coordinate system.

29. The method of claim 24, wherein the exterior gantry is a master system and the interior gantry is a slave system.

30. The method of claim 24, wherein the interior gantry utilizes a track assembly and the exterior gantry utilizes a rover vehicle.

31. The method of claim 24, wherein the inspection device on the exterior gantry and the inspection device on the interior gantry are each initialized at home positions that provide for visual contact between the inspection devices.

32. The method of claim 24, wherein the structure comprises an aircraft.

33. The method of claim 24, wherein the particularities that the inspection sequence is designed to identify comprise cracks and corrosion.

34. An inspection method for identifying defects in a structure, the method comprising:

moving an exterior rover gantry having a x-ray detector inspection device to a pre-determined position outside the structure and registering the exterior rover gantry to the structure;

mounting an interior rail gantry having an x-ray source inspection device onto alignment tracks at a pre-determined position inside the structure;

aligning the x-ray detector inspection device on the exterior rover gantry with the x-ray source inspection device on the interior rail gantry;

implementing a programmed inspection sequence to automatically move the detector inspection device and the source inspection device to each of a set of image collection positions; and

obtaining an x-ray image at each image collection position with the detector inspection device and the source inspection device.

35. The method of claim 34, wherein the inspection method utilizes an alignment system for aligning the x-ray detector inspection device with the x-ray source inspection device, wherein the alignment system is selected from the group of:

target alignment systems, laser alignment systems, radio frequency alignment systems, physical alignment systems, and optical alignment systems.

36. The method of claim 34, wherein the exterior rover gantry is a master system and the interior rail gantry is a slave system.

37. The method of claim 34, wherein the exterior rover gantry comprises axes and the interior rail gantry comprises axes, and wherein artificial axes are utilized that allow an operator to move each of the x-ray detector inspection device and the x-ray source inspection device in its respective coordinate system, rather than requiring desired motion of the x-ray detector inspection device to be input with respect to the exterior rover gantry axes and desired motion of the x-ray source inspection device to be input with respect to the interior rail gantry.

38. The method of claim 35, wherein the artificial axes register to an aircraft coordinate system.

39. The method of claim 34, wherein reverse kinematics are utilized to derive a set of interior rail gantry motions that achieve a sequence of image collection positions for the inspection device on the interior rail gantry corresponding to a programmed sequence of image collection positions for the inspection device on the exterior rover gantry.

40. The method of claim 34, wherein the obtaining of an x-ray image at each image collection position is performed when the exterior rover gantry and the interior rail gantry are intermittently stopped.

41. The method of claim 34, wherein the inspection sequence is programmed with the set of image collection positions, and wherein the structure includes substantially similar portions, and wherein during programming of the inspection sequence, image collection positions for the substantially similar portions of the structure are repeated within the inspection sequence during programming.

42. The method of claim 34, wherein the x-ray detector inspection device and the x-ray source inspection device are each initialized at home positions that allow for physical contact between the x-ray detector inspection device and the x-ray source inspection device.

43. The method of claim 34, wherein the structure comprises an aircraft.

44. The method of claim 34, wherein the defects that the inspection method identifies comprise cracks and corrosion.

45. A system for inspecting particularities in a structure, the system comprising:

a dual gantry system, wherein an exterior gantry is configured to move externally to the structure and an interior gantry is configured to move internally to the structure;

a first inspection device mounted on the exterior gantry;

a second inspection device mounted on the interior gantry, wherein one of the first or second inspection devices comprises a detector inspection device and the other of the first or second inspection devices comprises a source inspection device; and

a gantry control system that maneuvers the detector inspection device and the source inspection device in synchronized motion with each other to each of a set of data collection positions on the structure according to a programmed inspection sequence that controls movement of the detector and source inspection devices along the structure, and wherein the detector and source inspection devices collect data at each of the set of data collection positions on the structure.

46. The system of claim 45, wherein the exterior gantry and the interior gantry each comprise one or more low power actuators.

47. The system of claim 45, further comprising a data acquisition system that controls the data collection at each of the set of data collection positions on the structure.

48. The system of claim 45, further comprising a detector touch actuator.

49. The system of claim 45, wherein the inspection system utilizes an alignment system from the group of:

target alignment systems, laser alignment systems, radio frequency alignment systems, physical alignment systems, and optical alignment systems.

50. The system of claim 45, wherein the exterior gantry is a master system and the interior gantry is a slave system.

51. The system of claim 45, wherein the interior gantry comprises axes, and wherein artificial axes are utilized that allow an operator to command the second inspection device to move in its coordinate system, rather than requiring desired motion of the second inspection device to be commanded with respect to the interior gantry axes.

52. The system of claim 51, wherein the artificial axes register to an aircraft coordinate system.

53. The system of claim 45, wherein reverse kinematics are utilized to derive a set of interior gantry axes motions to effect a sequence of data collection positions for the second inspection device on the interior gantry corresponding to a programmed sequence of data collection positions for the first inspection device on the exterior gantry.

54. The system of claim 45, wherein the set of data collection positions comprise a set of image collection positions.

55. The system of claim 45, wherein the structure comprises an aircraft.

56. The system of claim 45, wherein the particularities that the inspection system identifies comprise cracks and corrosion.