| 摘要 |
PURPOSE:To detect a disconnected strand by fitting a converter to the end of a strand to be tested of parallel cables and injecting an ultrasonic pulse having transmittable frequency corresponding to the diameter of the strand to be tested into the strand to be tested within a specific frequency range to detect the reflected pulse from a disconnected position. CONSTITUTION:An ultrasonic pulse adjusted at 20KHzx-5MHz testing frequency is outputted from an ultrasonic tester 5 and transmitted to the converter 4. The converter 4 converts the electric signal into mechanical vibration to inject the ultrasonic pulse into the strand to be tested. If the strand to be tested is disconnected, the ultrasonic pulse is reflected at the disconnected point, transmitted again to the converter 4 through the strand and converted into an electric signal. The electric signal is sent to the tester 5, amplified and removed at its noise by a filter circuit and the noise- removed signal is displayed on a display device 6. The display device 6 displays both the transmitted pulse and the reflected pulse, so that the disconnected position can be found out from the time interval of both the pulses and the transmission speed. Thus, respective strands are successively tested and the existence of disconnection of all the strand of the cables and the disconnected positions can be precisely grasped. |
