Method and apparatus for diagnosing degradation of coating film on metal material
US4806849A · kind A · utility
33Cited by
4References
8Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Mar 27, 1987 |
| Grant date | Feb 21, 1989 |
| Priority date | — |
| Expiry date | Mar 27, 2007 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01N27/205
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
Method and apparatus for diagnosing degree of degradation of a coating film of a painted metal material by dividing the surface of the painted metal material into a number of small area zones, measuring impedance of the coating film at each of the zones through an AC impedance measuring technique, determining a statistic distribution and/or a two-dimensional distribution of impedance values measured at the individual zones to thereby determine the degree of degradation of the coating film of the painted metal material on the basis of the aforementioned distribution(s).
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.