Ultrasonic pulse echo flaw-detector

Claim 1

AN ULTRASONIC PULSE ECHO FLAW-DETECTOR, COMPRISING A HIGH-FREQUENCY GENERATOR FOR EXCITING SHORT PROBING ELECTRIC PULSES; A MOVABLE PROBE WITH AN ULTRASONIC TRANSDUCER CONNECTED TO SAID GENERATOR AND DISPOSED ON THE SURFACE OF THE OBJECT TO IRRADIATE THE SAME WITH AN ANGLED ULTRASONIC BEAM, WHICH TRAVERSES A CONTROLLED AREA INSIDE THE OBJECT AND IS REFLECTED FROM A FLAW BACK TO THE TRANSDUCER; A SIGNAL AMPLIFIER AT THE OUTPUT OF SAID TRANSDUCER; AN OSCILLOSCOPE WITH A CATHODE-RAY TUBE CONNECTED TO THE OUTPUT SIGNALS OF SAID AMPLIFIER FOR VISUALLY DISPLAYING THE OUTPUT SIGNALS OF SAID AMPLIFIER; MEANS FOR DELAYING THE START OF THE SWEEP OF SAID OSCILLOSCOPE WITH RESPECT TO THE APPEARANCE OF THE PROBING PULSE OF SAID GENERATOR; A ROTARY CYLINDER WITH A FLEXIBLE ELEMENT WOUND THEREON, ONE END OF SAID FLEXIBLE ELEMENT BEING ATTACHED TO THE CYLINDER AND THE OTHER FIXED TO SAID PROBE, SAID CYLINDER BEING DISPOSED IN FIXED POSITION RELATIVE TO THE OBJECT; DISPLACEMENT PICKUPS CONNECTED WITH SAID CYLINDER AND SAID FLEXIBLE ELEMENT TO MEASURE THE PROBE DISPLACEMENT WITH RESPECT TO THE CONTROLLED AREA OF THE OBJECT AND GENERATE SIGNALS CORRESPONDING TO SAID DISPLACEMENT, SAID PICKUPS BEING CONNECTED TO SAID SIGNAL AMPLIFIER AND SAID SWEEP DELAY MEANS TO ENABLE ITS SIGNALS TO CONTROL THE GAIN FACTOR OF THE AMPLIFIER AND THE MAGNITUDE OF SWEEP DELAY OF THE OSCILLOSCOPE DEPENDING ON THE DISTANCE BETWEEN THE PROBE AND THE CONTROLLED AREA OF THE OBJECT FOR MAINTAINING AN IDENTICAL RELATION BETWEEN THE MAGNITUDE OF THE SIGNAL MEASURED AT THE OSCILLOSCOPE OUTPUT AND THE SIZE OF THE FLAW ACROSS THE ENTIRE CONTROLLED AREA.