Ultrasonic signal processing system including a flaw gate
US4803638A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jun 26, 1986 |
| Grant date | Feb 7, 1989 |
| Priority date | — |
| Expiry date | Jun 26, 2006 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01N2291/2693
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
An ultrasonic signal processing system that includes flaw gates that process signals from an inspection transducer is disclosed. The flaw gates operate in pairs where each pair is dedicated to a time window corresponding to, for example, flaw depth or transducer angle. The time window for a pair of flaw gates is indicated by a channel code produced by a timing control unit. One flaw gate in each pair processes incoming digitized transducer signals during a scan to produce reflector indications while the other gate in each pair transfers data from a previous different position scan to a main computer. The main computer determines flaw locations from the reflector indications and transducer positions provided by the flaw gate. The flaw gates each adjust reflector indication location signals for changes in distance between an immersed ultrasonic wave inspection transducer and the surface of the material being inspected as well as record the location of the inspection transducer at the time of each indication detection. The flaw gates produce the indication by comparing the digitized transducer signal waveform with a threshold curve where an indication is an excursion of the signal wav…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.