Method of suppressing grain noise in ultrasonic waveform data by 3D filtering
US5471878A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Sep 27, 1993 |
| Grant date | Dec 5, 1995 |
| Priority date | — |
| Expiry date | Sep 27, 2013 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01N2291/101
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A method of suppressing grain noise resulting from ultrasonic inspection of an object, including ultrasonically scanning an object and detecting waveform signals therefrom, determining, from the signals, data values which define a 3D waveform data set U(x,y,t) having both spatial (x,y) and temporal (t) ultrasonic data values from the scanned object, converting the 3D waveform data set into a 3D filtered waveform data set V(x,y,t) by performing a 3D filtering operation thereon, wherein for each data value in the 3D waveform data set U(x,y,t), a filtered data value is obtained by taking into account data values which are adjacent thereto both spatially and temporally, thereby reducing grain noise relative to flaw signals to enable a high probability of flaw detection and a low probability of false flaw indications.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.