| 摘要 |
PURPOSE:To detect the water film thickness of cooling water flow by transmitting an ultrasonic pulse to a long molded steel plate and a reflector on a prescribed position by an ultrasonic probe fitted to a pad and measuring the time difference of echoes. CONSTITUTION:The ultrasonic probe 12 is fixed on the pad 1 through a probe holder 21, the reflector 13 is supported to the holder 21 by a supporting body 20, the reflector 13 is arranged on a position close to the probe 12 on the transmission line of the ultrasonic pulse from the probe 12, and an electric pulse transmitter 11 and a receiver 14 are connected to the probe 12 through a cable 15. The ultrasonic pulse is sent from the probe 12 to the inside of the long molded steel plate 2 and the reflector 13 and both the echoes are sent to a time measuring device 17 through the receiver 14 and gate circuits 16a, 16b to find out the time difference between both the echoes. Thus, the water film thickness of the cooling water flow 5 is found out from the distance between the reflector 13 and the plate 2 which is calculated by an operation processor 18 and a surface distance between the reflector 13 and the pad. |
