Method and apparatus for non-destructive testing
US6975391B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Mar 31, 1999 |
| Grant date | Dec 13, 2005 |
| Priority date | — |
| Expiry date | Mar 31, 2019 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01N2021/8918
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
Using an image signal acquired by picking up a sample to be inspected by a color video camera, penetrant inspection and magnetic-particle inspection, which are non-destructive inspections, are carried out so that deficiency candidates, including a pseudo deficiency, are automatically detected and displayed on a screen. A real deficiency can be detected from the displayed deficiency candidates. As image data is stored in memory means, information of a deficiency can be repeatedly reproduced on the screen. In the penetrant inspection, the chromaticity at each position on an image is acquired, a deficiency candidate is extracted based on the chrominance, and the deficiency is distinguished from a pseudo deficiency based on the differential value of the chrominance. A polarization filter eliminates regular reflection originating from illumination in the penetrant inspection, and an ultraviolet-rays cutting filter prevents noise in the magnetic-particle inspection. Both inspections can be carried out with a single probe.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.