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专利名称：Reference standard for calibration of
ultrasonic arrays
发明人：Thomas Derkacs,John Touhalisky申请号：US06/538393申请日：19831003公开号：US04660419A公开日：19870428
摘要：An array of ultrasonic transducer (A) are disposed along a circular arc forexamining tubular objects moving therethrough. A calibrating apparatus (B) includes acalibrating cylinder (22) having a plurality of calibrating flaws (24, 26) therein. A rotarypositioning device (30) and an axial positioning device (40) adjust the relative spatialrelationship of each calibration flaw and transducer. An ultrasonic control instrument (50)produces an echo signal having components corresponding to echoes received from theexamined object. A computer (60) includes a gate adjustment control subroutine (66)which selectively separates a preselected component from the echo signal. A pulseamplitude measurement subroutine () measures the amplitude of the preselectedecho signal component and, first, determines the peak amplitude of the component and,second, compares the amplitude of the component with a preselected standard. Aposition control subroutine (68), first, serially brings each calibration flaw generally into apreselected spatial relationship with each transducer and, second, adjusts the
flaw/transducer spatial relationship until the pulse amplitude measurement subroutinedetects the peak amplitude of the selected component. The spatial position of the peakamplitude is recorded in memory as an indication of the actual transducer location. A
calibration subroutine (62) adjusts the gain and distance amplitude control adjustmentsof the ultrasonic instrument until the pulse amplitude measurement subroutinedetermines that the selected component matches the preselected standard.
申请人：TRW INC.
代理人：Kenneth G. Preston, Jr.
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