Nondestruction coating adhesion evaluation using surface ultrasonic waves and wavelet analysis
US6587213B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Nov 15, 2000 |
| Grant date | Jul 1, 2003 |
| Priority date | — |
| Expiry date | Jun 7, 2021 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01N2291/0423
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
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.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.