Method of ultrasonically measuring thickness and characteristics of zirconium liner coextruded with zirconium tube
US4991440A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Feb 5, 1990 |
| Grant date | Feb 12, 1991 |
| Priority date | — |
| Expiry date | Feb 5, 2010 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01N2291/044
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A coextruded zirconium tube and tube liner are monitored along their lengths by well known ultrasonic measurement techniques that are modified by the blocking out of extraneous signals at opposite sides of a timing gate that varies in width according to variations in the width and shape characteristics of successive points along the length of such coextruded tube and liner. The blocking of such extraneous signals enables a normally very weak signal representing the interface between tube and tube liner to be identified and used, together with a group of stronger signals representing the inner surface of the tube liner, in monitoring tube liner thickness and characteristics by a sonic wave traversing the distance across the timing gate.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.