| 摘要 |
PURPOSE:To attain a high speed scanning by scanning an ultrasonic transducer in both positive and negative directions and converting an ultrasonic wave receiving signal in one direction into a video signal. CONSTITUTION:A high voltage electric pulse generated from an ultrasonic flaw detector 29 is applied to the ultrasonic transducer 21 through a scanner 24 and the generated ultrasonic pulse is irradiated to a subject 23 to be tested. A reflected signal from the internal defect 28 of the subject 23 is inputted to a flaw detector 29 through the transducer 21 and the scanner 24,amplified and outputted as an ultrasonic receiving signal 27. The transducer 21 is driven by the scanner 24, a positional signal 26 and a scanning direction signal 11 are outputted from the scanner 24. When the scanner 24 is reciprocally scanning in the positive and negative directions, the signal 11 is outputted so that a gate is set up to the opened level in the positive scanning or as a gate to the closed level in the negative scanning. Therefore, the signal 27 is inputted to a video device 13 through a gate circuit 12 in the positive scanning, but is interrupted at the negative scanning. The device 13 synthesizes a scanning video signal 14 from the signals 27, 26 and displays the synthesized video signal 14 on a display unit 15. |
