Reference standard for calibration of ultrasonic arrays
US4660419A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Oct 3, 1983 |
| Grant date | Apr 28, 1987 |
| Priority date | — |
| Expiry date | Oct 3, 2003 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01N2291/2634
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
An array of ultrasonic transducer (A) are disposed along a circular arc for examining tubular objects moving therethrough. A calibrating apparatus (B) includes a calibrating cylinder (22) having a plurality of calibrating flaws (24, 26) therein. A rotary positioning device (30) and an axial positioning device (40) adjust the relative spatial relationship of each calibration flaw and transducer. An ultrasonic control instrument (50) produces an echo signal having components corresponding to echoes received from the examined object. A computer (60) includes a gate adjustment control subroutine (66) which selectively separates a preselected component from the echo signal. A pulse amplitude measurement subroutine (64) measures the amplitude of the preselected echo signal component and, first, determines the peak amplitude of the component and, second, compares the amplitude of the component with a preselected standard. A position control subroutine (68), first, serially brings each calibration flaw generally into a preselected spatial relationship with each transducer and, second, adjusts the flaw/transducer spatial relationship until the pulse amplitude measurement subroutine detects …
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.