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United States Patent | 6,587,213 |
Knight , et al. | July 1, 2003 |
The present invention is a nondestructive and quantitative laser ultrasonic laser apparatus and associated method for determining adhesion quality of a coating on a substrate. The apparatus of the invention is preferably a pulsed laser for generation and Michelson-type interferometer based system and includes a rotary probe head assembly for making evaluations within a cylindrical test specimen. The method of the invention includes data analysis that uses acquired data from the ultrasonic laser apparatus and computes the dispersion relation or curves (frequency versus velocity) using a ridge-following technique in wavelet analysis and from this, outputs the adhesive quality of the coating by comparing it with a theoretically based determination of a particular coating/substrate bond system. The invention is used for evaluating adhesion quality of coatings used in a gun bore.
Inventors: | Knight; Bryon (Averill Park, NY), Frankel; Julius (Rensselaer, NY), Hussain; Moayyed (Menands, NY), Braunstein; Jeffrey (Basement Troy, NY) |
---|---|
Assignee: |
The United States of America as represented by the Secretary of the Army
(Washington,
DC)
|
Family ID: | 24876808 |
Appl. No.: | 09/716,115 |
Filed: | November 15, 2000 |
Current U.S. Class: | 356/502; 356/241.2 |
Current CPC Class: | G01H 1/04 (20130101); G01N 29/2418 (20130101); G01N 29/348 (20130101); G01N 29/46 (20130101); G01N 2291/0231 (20130101); G01N 2291/0234 (20130101); G01N 2291/0251 (20130101); G01N 2291/0423 (20130101) |
Current International Class: | G01N 29/46 (20060101); G01N 29/24 (20060101); G01N 29/34 (20060101); G01N 29/44 (20060101); G01H 1/00 (20060101); G01H 1/04 (20060101); G01B 009/02 () |
Field of Search: | ;356/502,432T,486,492,241.1,241.2,626 |
4541280 | September 1985 | Cielo et al. |
5268967 | December 1993 | Jang et al. |
5724138 | March 1998 | Reich et al. |
6181431 | January 2001 | Siu |
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