| 摘要 |
PURPOSE:To exactly display the height of echo signal within the inspection range by specifying the time range of start and finish according to a gate timing signal and detecting the maximum value among data existing in the period during this signal is outputted. CONSTITUTION:A contact probe is excited by a transmission part in accordance with a trigger signal of timing circuit 8, and the received echo signal is converted to a digital value with a specified sampling cycle by an A/D converter 5 and outputted to a waveform memory and gate circuit 21, and addresses of the data stored in the waveform memory are successively specified by an address counter 7. At this time, the gate circuit 21 is constituted of a gate signal generating circuit 22 and maximum value detecting circuit 23, and the gate signal for the purpose of extracting the echo signal only in the inspecting range for an object to be inspected is generated by the circuit 22, and the maximum value of echo signal which is inputted in the gate period formed in the circuit 22 is detected by the circuit 23. By such an arrangement, the size of defect can be exactly detected. |
