1
Collins Jack T, Van Valkenburg Howard E: Ultrasonic nondestructive material tester. Automation, Sadler Dan R, July 2, 1974: US3821891 (18 worldwide citation)

An ultrasonic nondestructive material tester is disclosed which is especially useful in making interface measurements of an eyeball. An ultrasonic transducer receives ultrasonic energy returned from within the eyeball. An oscilloscope which includes a plurality of display channels operates synchrono ...


2
Van Valkenburg Howard E, Mccarroll Vincent P: Systeme de compensation de lamplitude-distance, Distance amplitude compensation system. Automation, SMART & BIGGAR, September 15, 1981: CA1109144

ABSTRACT A distance amplitude compensation system is disclosedherein for comparing received signals with a reference signal havinga time varying amplitude. The preferred embodiment of the inventiondisclosed herein is particularly adapted for use in an ultrasonicnondestructive testing system to vary ...