Ultrasonic testing of fitting assembly for fluid conduits with a hand-held apparatus

• US 7,284,433 B2
• Filed: 06/17/2003
• Issued: 10/23/2007
• Est. Priority Date: 06/17/2002
• Status: Expired due to Fees

• Current Assignee: Swagelok Company
• Original Assignee: Swagelok Company
• Inventors: Williams, Peter C., Glime, William H., Ales, Richard A., Rubinski, Jeffrey M., Yang, Wenxian, Hull, John Barry, Seymour, Michael Douglas
• Primary Examiner(s): CHAPMAN JR, JOHN E
• Application Number:
  US10/518,337
• Publication Number:
  US 20050256676A1
• Time in Patent Office: 1,589 Days
• Field of Search: 735/99, 736/22, 736/27, 735/97, 285/93
• US Class Current: 73/597
• CPC Class Codes: G01N 2291/02491 Materials with nonlinear acoustic properties
• CPC Class Codes: G01N 2291/0422 Shear waves, transverse waves, horizontally polarised waves
• CPC Class Codes: G01N 2291/0423 Surface waves, e.g. Rayleigh waves, Love waves
• CPC Class Codes: G01N 2291/044 Internal reflections (echoes), e.g. on walls or defects
• CPC Class Codes: G01N 2291/056 Angular incidence, angular propagation
• CPC Class Codes: G01N 2291/2634 cylindrical from outside
• CPC Class Codes: G01N 2291/2691 Bolts, screws, heads
• CPC Class Codes: G01N 29/043 in the interior, e.g. by shear waves
• CPC Class Codes: G01N 29/11 by measuring attenuation of acoustic waves
• CPC Class Codes: G01N 29/2462 Probes with waveguides, e.g. SAW devices
• CPC Class Codes: G01N 29/2468 Probes with delay lines
• CPC Class Codes: G01N 29/28 providing acoustic coupling , e.g. water impedance matching G10K11/02
• CPC Class Codes: G01N 29/46 by spectral analysis, e.g. Fourier analysis or wavelet analysis spectral signal processing per se G06F17/14

Abstract

Hand-held apparatus and method for determining relative and/or absolute axial position of a conduit end within a fluid coupling includes application of input ultrasonic energy in the form of transient shear waves and analyzing the reflected energy. Application of the input energy collected at different radial positions about a first axial location is used with wavelet based correlation techniques to better analyze the reflected energy signals. Quality of the abutment between the conduit end and a surface associated with the coupling may also be determined as a separate or combined feature of the axial position determination.

Claims

1. A tool for evaluating a fitting assembly of the type having a conduit assembled at one end to a fitting comprising a body, a nut, and at least one conduit gripping device, the tool comprising:

a source adapted to apply mechanical energy into the conduit;

said source receiving reflected energy and producing a signal related thereto; and

an analyzer that determines axial position within the fitting assembly of an end of the conduit relative to said source.

2. The tool of claim 1, wherein the source is integrated with a gap gauge.

3. The tool of claim 1, wherein the analyzer is integrated with a gap gauge.

4. The tool of claim 1, wherein said tool includes a gap gauge and an ultrasonic analyzer.

5. The tool of claim 1, wherein said source comprises a separate transmitter and receiver.

6. The tool of claim 1, wherein said source produces transient shear ultrasonic energy waves.

7. The tool of claim 1, wherein said analyzer correlates data based on received energy from a plurality of source positions.

8. The tool of claim 7, wherein said correlation is based on a Morlet wavelet correlation function.

9. The tool of claim 1, wherein said source applies mechanical energy to the fitting body.

10. The tool of claim 1, wherein said energy waves are applied to the conduit at an angle within the range of about greater than 0°

to about 90°

from normal relative to a longitudinal axis of the conduit.

11. The tool of claim 1, wherein said axial position of an end of the conduit relative to said source relates to bottoming of an end of the conduit against a shoulder in the fitting body.

12. The tool of claim 10, wherein said source is adapted to apply energy at two or more different locations about the conduit, said source producing a plurality of electrical signals in response to said received energy, each electrical signal corresponding to a respective one of said locations.

13. The tool of claim 12 comprising a correlation function of said plurality of electrical signals and wherein said analyzer produces an output that corresponds to said axial position of an end of the conduit based on said correlation.

14. The tool of claim 1, further comprising a base adapted to align with a surface of the conduit.

15. The tool of claim 14, wherein the base is provided with a mating surface that conforms to a outer surface of the conduit.

16. The tool of claim 14, wherein the base comprises a low attenuation plastic.

17. The tool of claim 14, wherein the base comprises an acrylic resin.

18. The tool of claim 1, wherein the source is positioned at a reference position of the fitting.

19. The tool of claim 18, wherein said axial position of the end of the conduit is relative to the reference position of the fitting.

20. The tool of claim 19, wherein the analyzer is adapted to compare the axial position of the end of the conduit, relative to the reference position of the fitting, to corresponding test data for a properly installed fitting assembly.

21. The tool of claim 1, wherein said analyzer is adapted to compare said axial position to a corresponding axial position related to a properly pulled-up fitting assembly.

22. The tool of claim 1, wherein said source comprises a transmitter and receiver in a single device.

23. A tool for evaluating a fitting assembly of the type having a conduit assembled at one end to a fitting comprising a body, a nut, and at least one ferrule, the tool comprising:

a source adapted to apply mechanical energy into the conduit;

said source receiving reflected energy and producing a signal related thereto; and

an analyzer that determines a characteristic of an end portion of the conduit within the fitting as a function of said signal, wherein said characteristic relates to the relative axial position of an impression in the conduit formed by the at least one ferrule assembled to the conduit,relative to a position of the source.

24. A tool for evaluating a fitting assembly of the type having a conduit assembled at one end to a fitting comprising a body, a nut, and at least one ferrule, the tool comprising:

a source adapted to apply mechanical energy into the conduit;

said source receiving reflected energy and producing a signal related thereto; and

an analyzer that determines a characteristic of an end portion of the conduit within the fitting as a function of said signal, wherein said characteristic relates to the presence of an impression in the conduit formed by the at least ferrule assmbled to the conduit.