Method and apparatus for ascertaining ultrasonic beam patterns

Claim 1

THE METHOD OF TESTING SOLID AND OPAQUE OBJECTS AS TO THEIR INTERNAL STRUCTURES, FLAWS, DEFECTS AND THE LIKE COMPRISING THE STEPS OF, IMMERSING IN A LIQUID AN ULTRASONIC TRANSMITTER CAPABLE OT TRANSMITTING AN ULTRASONIC BEAM, IMMERSING IN THE LIQUID AN OBJECT TO BE TESTED IN THE PATH OF THE ULTRASONIC BEAM, EXCITING AND IMMERSING IN THE LIQUID WHILE THE TRANSMITTER IS TURNED OFF A LONG DECAY TIME PHOSPHORESCENT SCREEN ON THE SIDE OF THE OBJECT TO BE TESTED OPPOSITE TO THE ULTRASONIC TRANSMITTER AND IN THE PATH OF THE ULTRASONIC BEAM TO BE PASSED THROUGH THE OBJECT TO BE TESTED, THEN ENERGIZING THE IMMERSED ULTRASONIC TRANSMITTER TO TRANSMIT AN ULTRASONIC BEAM THROUGH THE LIQUID AND THE OBJECT TO BE TESTED WHILE THE SCREEN IS NOT OTHERWISE BEING EXCITED, SUBJECT THE IMMERSED EXCITED PHOSPHORESCENT SCREEN IN THE ABSENCE OF EXCITING ENERGY AND FOR A TIME INTERVAL TO THE BEAM TRANSMITTED THROUGH THE LIQUID AND THE OBJECT BEING TESTED BY THE ULTRASONIC TRANSMITTER TO MODIFY THE RATE OF DECAY OF THE PHOSPHORESCENCE OF THE SCREEN TO FORM A VISUAL PATTERN THEREONIN ACCORDANCE WITH THE INTERNAL STRUCTURE, FLAWS, DEFECTD OR THE LIKE OF THE OBJECT BEING TESTED.