Method to characterize material using mathematical propagation models and ultrasonic signal

• US 6,856,918 B2
• Filed: 11/26/2001
• Issued: 02/15/2005
• Est. Priority Date: 11/26/2001
• Status: Active Grant

• Current Assignee: Lockheed Martin Corporation (Martin Marietta Corporation)
• Original Assignee: Lockheed Martin Corporation (Martin Marietta Corporation)
• Inventors: Dubois, Marc, Drake, Thomas E., Lorraine, Peter W., Filkins, Robert J.
• Primary Examiner(s): Barlow, John
• Assistant Examiner(s): BHAT, ADITYA S
• Application Number:
  US09/996,098
• Publication Number:
  US 20030101007A1
• Time in Patent Office: 1,177 Days
• Field of Search: 702/39, 73/240.1, 367/98, 367/92, 434/251
• US Class Current: 702/39
• CPC Class Codes: G01N 29/0645 Display representation or displayed parameters, e.g. A-, B- or C-Scan
• CPC Class Codes: G01N 29/2418 using optoacoustic interaction with the material, e.g. laser radiation, photoacoustics photoacoustic cells G01N21/1702; measuring characteristics of vibrations by using radiation-sensitive means G01H9/00; acousto-optical conversion techniques for short-range imaging G01S15/8965; sound-producing devices using laser bundle G10K15/046
• CPC Class Codes: G01N 29/4418 with a model, e.g. best-fit, regression analysis
• CPC Class Codes: G01N 29/48 by amplitude comparison

Abstract

The invention is directed to a system and method for detecting defects in a manufactured object. These defects may include flaws, delaminations, voids, fractures, fissures, or cracks, among others. The system utilizes an ultrasound measurement system, a signal analyzer and an expected result. The signal analyzer compares the signal from the measurement system to the expected result. The analysis may detect a defect or measure an attribute of the manufactured object. Further, the analysis may be displayed or represented. In addition, the expected result may be generated from a model such as a wave propagation model. One embodiment of the invention is a laser ultrasound detection system in which a laser is used to generate an ultrasonic signal. The signal analyzer compares the measured ultrasonic signal to an expected result. This expected result is generated from a wave propagation model. The analysis is then displayed on a monitor.

Claims

1. A system for the detection of a physical attribute of a manufactured object, the system comprising:

a sonic measuring device;

the sonic measuring device detecting a signal indicative of the physical attribute;

the sonic measuring device generating a measured result associated with the signal;

a signal analyzer, communicatively coupled to the sonic measuring device, that is operable to receive the measured result;

an expected result;

the signal analyzer comparing the expected result to the measured result, automatically; and

the signal analyzer producing a comparison of the measure result and the expected result;

a model processor communicatively coupled to the signal analyzer; and

the model processor generating the expected result from a representation of the manufactured object, wherein the representation of the manufactured object is a computer-aided-drafting representation of the manufactured object.

2. A system for the detection of a physical attribute of a manufactured object, the system comprising:

a sonic measuring device;

the sonic measuring device detecting a signal indicative of the physical attribute;

the sonic measuring device generating a measured result associated with the signal;

a signal analyzer, communicatively coupled to the sonic measuring device, that is operable to receive the measured result;

an expected result;

the signal analyzer comparing the expected result to the measured result automatically;

the signal analyzer producing a comparison of the measure result and the expected result;

a display communicatively coupled to the signal analyzer; and

the display displaying the comparison of the measured result and the expected result.

3. A method for detecting a physical attribute of a manufactured object using a sonic measuring device, the sonic measuring device measuring sonic energy from the manufactured object and obtaining a measured signal, the method comprising:

generating the expected result from a mathematical model; and

comparing the measured signal to an expected result; and

determining the physical attribute based on the step of comparing.

4. The method of claim 3 wherein the comparison is selectively repeated, the expected result being repeatedly generated from an iteratively adapted mathematical model, the comparison being selectively repeated until a quantifier indicative of the comparison has a predetermined value.

5. A method for detecting a physical attribute of a manufactured object using a sonic measuring device, the sonic measuring device measuring sonic energy from the manufactured object and obtaining a measured signal, the method comprising:

comparing the measured signal to an expected result;

determining the physical attribute based on the step of comparing; and

displaying the physical attribute.

6. A system for the detection of a physical attribute of a manufactured object wherein a sonic measuring device measures a sonic energy from the manufactured object and produces a measured signal, the system comprising:

a signal analyzer communicatively coupled to the sonic measuring device and operable to receive the measured signal;

an expected result;

the signal analyzer comparing the expected result to the measured result automatically;

the signal analyzer producing a comparison of the measured signal and the expected result;

a model processor communicatively coupled to the signal analyzer; and

the model processor generating the expected result from a representation of the manufactured object,

wherein the representation of the manufactured object is a computer-aided-drafting representation of the manufactured object.

7. A system for the detection of a physical attribute of a manufactured object wherein a sonic measuring device measures a sonic energy from the manufactured object and produces a measured signal, the system comprising:

a signal analyzer communicatively coupled to the sonic measuring device and operable to receive the measured signal;

an expected result;

the signal analyzer comprising the expected result to the measured result automatically;

the signal analyzer producing a comparison of the measured signal and the expected result;

a display communicatively coupled to the signal analyzer; and

the display displaying the comparison of the measured signal and the expected result.

8. The system of claim 7 wherein the display is a C-Scan.

9. The system of claim 7 wherein the display is a B-Scan.

10. The system of claim 7 wherein the display displays the comparison as a three dimensional image relative to the geometry of the manufactured object.

11. A system for the detection of a physical attribute of a manufactured object wherein a sonic measuring device measures a sonic energy from the manufactured object and produces a measured signal, the system comprising:

a signal analyzer communicatively coupled to the sonic measuring device and operable to receive the measured signal;

a model processor communicatively coupled to the signal analyzer;

the signal analyzer comprising an output of the model processor to the measured result automatically; and

the signal analyzer producing a comparison of the measured signal and the output of the model processor, wherein the model processor generates the output of the model processor by solving a mathematical model.

12. The system of claim 11 wherein the comparison is selectively repeated using the output of the model processor selectively repeatedly generated by adapting a parameter of the mathematical model in response to the comparison of the measured signal and the output of the model processor.

13. The system of claim 12 wherein the physical attribute of the manufactured object is determined from the value of the parameter of the mathematical model.

14. A method for detecting a physical attribute of a manufactured object wherein a sonic measuring device measures a sonic energy from the manufactured object and produces a measured signal, the method comprising:

comparing the measured signal to an output from a model processor with a signal analyzer; and

producing an output from the signal analyzer indicative of the step of comparing, wherein the steps of comparing and producing are selectively repeated, the comparing being of the measured signal and the output form the model processor, the model processor selectively changing the output in response to the output from the signal analyzer, and wherein the model processor selectively changes the output by adaptively changing a parameter in a mathematical model and determining the output from the mathematical model.