| 摘要 |
PURPOSE:To reduce remarkably the number of signal transmission cables by encoding a selecting signal for selecting plural ultrasonic probes by a binary notation, transmitting it, and connecting electrically only a selected probe to an ultrasonic flaw detector. CONSTITUTION:A number of an ultrasonic probe 4 to be operated is selected by an ultrasonic probe selecting switch 5. It is displayed by an indicator 7, confirmed by an inspector, and simultaneously, inputted to an ultrasonic probe selecting signal generator 6, and an ultrasonic probe selecting signal encoded by a binary notation is outputted. A pattern of a specified voltage state corresponding to each of the ultrasonic probe 4 to be selected exists, and it is transmitted to an ultrasonic probe selecting signal decoder 8 through an ultrasonic probe selecting signal transmission cable 10. This voltage pattern information is decoded and a relay in a relay circuit 9 connected with the corresponding ultrasonic probe is energized. Only the ultrasonic probe 4 connected to this relay makes a closed circuit with an ultrasonic flaw detector 3 installed at an operating unit 1 side. |
