ULTRASONIC TESTER FOR QUALITY CONTROL OF COARSE-GRAINED MATERIALS Russian patent published in 1995 - IPC

FIELD: nondestructive test of materials quality. SUBSTANCE: device is furnished with series- connected illumination generator and additional delay circuits, and a selector switch with a definite number of positions and ways, and used to switch on standard pulse shapers before the delay circuits. EFFECT: enhanced sensitivity and reliability of quality control of materials and products due to detection not only of the defect but also of its size. 2 cl, 2 dwg