Reference standard for calibration of ultrasonic arrays

Details Reference standard for calibration of ultrasonic arrays Reference standard for calibration of ultrasonic arrays

1983-10-03

1987-04-28

Levy, Stewart J.

Measuring and testing

Vibration

By mechanical waves

73 1DV, G01N 2904

Patent

active

046604197

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 the peak amplitude of the selected component. The spatial position of the peak amplitude is recorded in memory as an indication of the actual transducer location. A calibration subroutine (62) adjusts the gain and distance amplitude control adjustments of the ultrasonic instrument until the pulse amplitude measurement subroutine determines that the selected component matches the preselected standard.

REFERENCES:
patent: 4173139 (1979-11-01), Conn
patent: 4462082 (1984-07-01), Thiele et al.
Kyte et al., "A High--Speed Ultrasonic Testing Machine for Tubes," The Radio and Electronic Engineer, vol. 41, No. 5, May 1971, pp. 213-222.
"Use of DAC Curves and Transfer Lines to Maintain Ultrasonic Test Level Sensitivity" by Burkle et al. from Materials Evaluation, May 1983.

Affiliated with

Also associated with

Rating

Reference standard for calibration of ultrasonic arrays does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Reference standard for calibration of ultrasonic arrays, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Reference standard for calibration of ultrasonic arrays will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-469921