Ultrasonic method for measurement of depth of surface opening flaw in solid mass
US5005420A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Mar 30, 1989 |
| Grant date | Apr 9, 1991 |
| Priority date | — |
| Expiry date | Mar 30, 2009 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01N2291/101
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
The present invention provides a method for ultrasonic measurement of mainly the depth of a flaw possibly existent in a solid mass and opening to the surface of the solid mass. An ultrasonic wave is transmitted into the solid mass by scanning an ultrasonic probe back and forth on the surface of the solid mass with respect to a flaw in the solid mass, a threshold of a predetermined level is set for a curve defined by levels of echoes of the ultrasonic waves reflected from the flaw according to the position of probe, the area under the curve and above the threshold is integrated for the range of movement of the probe, and the depth of the surface opening flaw is measured using as an evaluation index the value of the integrated area of the area. The method according to the present invention is applicable to nondestructive, easy, accurate and realtime measurement of the depth of weld cracking in a welded portion, fatigue cracks in a stress-concentrated portion of members of a machine, etc.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.