METHOD AND SYSTEM OF USING 1.5D PHASED ARRAY PROBE FOR CYLINDRICAL PARTS INSPECTION

• US 20130283918A1
• Filed: 03/29/2013
• Published: 10/31/2013
• Est. Priority Date: 03/29/2013
• Status: Active Grant

• Current Assignee: Evident Scientific Incorporated (Olympus Corporation)
• Original Assignee: Olympus Ndt Incorporated (Olympus Corporation)
• Inventors: Zhang, Jinchi, Habermehl, Jason
• Granted Patent: US 9,080,951 B2
• Time in Patent Office: Days
• US Class Current: 73/622
• CPC Class Codes: G01N 2291/106 one or more transducer arrays
• CPC Class Codes: G01N 2291/2634 cylindrical from outside
• CPC Class Codes: G01N 29/069 Defect imaging, localisation and sizing using, e.g. time of flight diffraction [TOFD], synthetic aperture focusing technique [SAFT], Amplituden-Laufzeit-Ortskurven [ALOK] technique
• CPC Class Codes: G01N 29/26 Arrangements for orientation or scanning by relative movement of the head and the sensor mechanical steering of sound transducers or their beams G10K11/35
• CPC Class Codes: G01N 29/262 by electronic orientation or focusing, e.g. with phased arrays phased arrays per se G10K11/34
• CPC Class Codes: G01N 29/265 by moving the sensor relative to a stationary material

Abstract

A method of using a 1.5D array ultrasonic probe as a component of an inspection system intended for different diameter cylindrical parts without mechanical adjustments of the probe is presented. In particular, the method is presented as a way to improve the near surface resolution over an extended range of cylindrical parts diameter and inspection depths/tubes wall thickness with respect to usual 1D arrays of fixed curvature along the elevation axis. The method relies on a customizable concentric firing pattern of the acoustic pulses with respect to the cylindrical part surface, and on adjustment of the aperture size of the said array. The intended effect is to sharpen and minimize the extent of the front wall echo and to optimize the response from an eventual flaw in the inspected range.

Claims

1. An ultrasonic inspection system configured to be coupled with a 1.5D array acoustic probe, the probe including a plurality of transducers arranged in a linear bi-dimensional matrix and being engaged with a test surface of a cylindrical test object during the inspection of the test object, and the probe is operable by the system with an optimal size of aperture,

the system comprises,

an acquisition unit configured to execute desired focal laws to energize the probe to emit an acoustic field and receive corresponding response signals;

a data processing and control unit for analyzing and displaying inspection result based on the response signals, the processing and control unit further comprising,

a probe control module providing a set of required inspection parameters pertaining to the cylindrical test object,

an aperture optimization module providing the optimal size of the aperture according to the required inspection parameters,

a concentric delay module providing delay-based concentric focal laws as the desired focal laws for the optimal aperture, and the desired focal laws are subsequently provided to the acquisition unit for energizing the probe.

2. The system of claim 1 is operable to provide the capacity of the inspection of the said test object based on a set of known probe characteristics, the required inspection parameters of the test object and the probe-to-test object distance.

3. The system of claim 1, wherein the acquisition module is configured so that the plurality of transducers are controlled to transmit an acoustic field in a way that the sound pulse from each transducer reaches the test surface simultaneously in time.

4. The system of claim 1, wherein the probe has an elevation axis and the aperture optimization module determines the size of the aperture along the elevation axis in a way so that the intensity of the acoustic field within the desired near surface inspection range is optimum.

5. The system of claim 2, wherein the aperture optimization module and the concentric delay module are configured to suit for the near surface inspection of the cylindrical test object with varying diameters without recurring need for mechanical adjustments of the probe-to-part distance.

6. The system of claim 1 further includes a user interface for displaying inspection results.