FLEXIBLE EDDY CURRENT PROBE

• US 20160025682A1
• Filed: 08/30/2012
• Published: 01/28/2016
• Est. Priority Date: 07/11/2012
• Status: Abandoned Application

• Current Assignee: Electric Power Research Institute Incorporated
• Original Assignee: Electric Power Research Institute Incorporated
• Inventors: WALKER, Stanley Maurice, BURKHARDT, Gary Lane, CAPPS, Matthew Louis, BARTLETT, Jonathan Dale
• Application Number:
  US14/413,468
• Publication Number:
  US 20160025682A1
• Time in Patent Office: Days
• US Class Current: 1/1
• CPC Class Codes: G01N 27/9006 Details, e.g. in the structure or functioning of sensors
• CPC Class Codes: G01N 27/904 with two or more sensors

Abstract

A flexible eddy current probe and a method of use are provided. A flexible eddy current probe (300) includes at least one substantially planar eddy current array (304) capable of measuring an electromagnetic condition of a portion of a test object (202), wherein the at least one eddy current array (304) is disposed on a flexible substrate (316), and wherein the flexible substrate (316) is conformable to a portion of the test object (202). The flexible eddy current probe includes at least one elongated electrical conductor (312) capable of electrically connecting the at least one eddy current array (304) to a test instrument, and a glove (402) capable of being fitted to an operator'"'"'s hand and capable of carrying the eddy current array (304) and conforming the array in testing communication with the test object (202).

Claims

1. A flexible eddy current probe comprising:

at least one substantially planar eddy current array capable of measuring an electromagnetic condition of a portion of a test object, wherein the at least one eddy current array is disposed on a flexible substrate, and wherein the flexible substrate is conformable to a portion of the test object;

at least one elongated electrical conductor capable of electrically connecting the at least one eddy current array to a test instrument; and

at least one finger or palm strap operable to removably attach the at least one flexible eddy current array to an operator'"'"'s hand.

8. The flexible eddy current probe of claim 1, wherein the at least one flexible eddy current array comprises a plurality of eddy current sensors capable of multiplexed operation.

9. The flexible eddy current probe of claim 1, wherein the flexible substrate is a flexible printed circuit board.

10. The flexible eddy current probe of claim 1, wherein the plurality of eddy current sensors comprises a two dimensional array of transducers printed on the flexible circuit board.

11. The flexible eddy current probe of claim 1, including a resilient material disposed between the at least one flexible eddy current array and the operator'"'"'s hand, wherein the resilient material is operative to provide proximity between the eddy current array and the test object.

12. The flexible eddy current probe of claim 1, including a rigid connector part interposed between the at least one eddy current array and the at least one elongated electrical conductor.

13. The flexible eddy current probe of claim 12, wherein the rigid connector part comprises a printed circuit board capable of providing an electrical connection between the at least one eddy current array and the at least one elongated electrical conductor.

14. The flexible eddy current probe of claim 13, wherein the printed circuit board is removably connected to the at least one eddy current array and the at least one elongated electrical conductor.

2. A flexible eddy current probe comprising:

at least one substantially planar eddy current array capable of measuring an electromagnetic condition of a portion of a test object, wherein the at least one eddy current array is disposed on a flexible substrate, and wherein the flexible substrate is conformable to a portion of the test object;

at least one elongated electrical conductor capable of electrically connecting the at least one eddy current array to a test instrument; and

a glove capable of being fitted to an operator'"'"'s hand, wherein the glove is capable of carrying the at least one flexible eddy current array and conforming the array in testing communication with the test object.

3. The flexible eddy current probe of claim 2, wherein the glove comprises at least one fingers section, and a base section having an opening, the fingers section connected to the base section opposite the opening, wherein the base section includes a palm portion.

4. The flexible eddy current probe of claim 2, wherein the glove is capable of carrying the at least one eddy current array at the fingers section, the base section and/or the palm portion of the glove.

5. The flexible eddy current probe of claim 4, wherein the glove is capable of carrying the at least one eddy current array utilizing a pocket, a strap, and/or a fastener.

6. The flexible eddy current probe of claim 2, wherein the glove comprises a heat-resistant material.

7. The flexible eddy current probe of claim 2, wherein the glove comprises silicone, neoprene, leather, cloth, nylon, rubber, plastic, canvas, or spandex.

21. The flexible eddy current probe of claim 2, wherein the at least one flexible eddy current array comprises a plurality of eddy current sensors capable of multiplexed operation.

22. The flexible eddy current probe of claim 2, wherein the flexible substrate is a flexible printed circuit board.

23. The flexible eddy current probe of claim 2, wherein the plurality of eddy current sensors comprises a two dimensional array of transducers printed on the flexible circuit board.

24. The flexible eddy current probe of claim 2, including a resilient material disposed between the at least one flexible eddy current array and the operator'"'"'s hand, wherein the resilient material is operative to provide proximity between the eddy current array and the test object.

25. The flexible eddy current probe of claim 2, including a rigid connector part interposed between the at least one eddy current array and the at least one elongated electrical conductor.

26. The flexible eddy current probe of claim 25, wherein the rigid connector part comprises a printed circuit board capable of providing an electrical connection between the at least one eddy current array and the at least one elongated electrical conductor.

27. The flexible eddy current probe of claim 26, wherein the printed circuit board is removably connected to the at least one eddy current array and the at least one elongated electrical conductor.

15. A method of non-destructive testing, the method comprising:

providing a flexible eddy current probe having

at least one substantially planar eddy current array capable of measuring an electromagnetic condition of a portion of a test object, wherein the at least one eddy current array is disposed on a flexible substrate, and wherein the flexible substrate is conformable to a portion of the test object,

at least one elongated electrical conductor capable of electrically connecting the eddy current array to a test instrument; and

a glove capable of carrying the at least one flexible eddy current array;

placing an operator'"'"'s hand in the glove;

positioning the operator'"'"'s gloved hand such that the flexible eddy current probe is in operative contact with the test object;

performing a test by applying manual pressure to the flexible eddy current probe so as to conform the eddy current array to a portion of the surface of the test object and inducing an eddy current in the test object;

measuring an electromagnetic condition of a portion of the test object utilizing the test instrument by receiving at least one return signal;

evaluating the at least one return signal to identify one or more defects in the test object.

16. The method of claim 15, wherein performing a test by applying manual pressure to the flexible eddy current probe comprises scanning the eddy current probe over a surface of the test object.

17. The method of claim 15, wherein inducing an eddy current in the test object includes sending an alternating current capable of inducing an eddy current in the test object from the test instrument to the eddy current array.

18. The method of claim 15, wherein measuring an electromagnetic condition of a portion of the test object includes monitoring an electrical characteristic of the eddy current array.

19. The method of claim 15, wherein the test object is a weld.

20. The method of claim 19, wherein the weld is a tube-to-header weld of a heat recovery steam generator.

28. The method of claim 16, wherein the test object is a weld.

29. The method of claim 17, wherein the test object is a weld.

30. The method of claim 18, wherein the test object is a weld.