| 摘要 |
PURPOSE:To assure exact detection of air bubbles and the resilience of a cable. CONSTITUTION:This air bubble detector has an ultrasonic vibrator 2 used for transmission and reception of ultrasonic signals, a pulser 5 for intermittently transmitting impulsive ultrasonic waves by driving this ultrasonic vibrator 2, an amplifier circuit 7 for amplifying the signal received by the ultrasonic vibrator 2, a gate circuit 8 for allowing the passage of the output signal of this amplifier circuit 7 only at the time of gate signal input, a detecting circuit 9 for detecting the air bubble from the output signal of this gate circuit 8 and a timing circuit 4 for outputting the gate signal only for the specified time duration at the intermediate timing of the respective transmission timings of the impulsive ultrasonic waves. |
