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.
TAKAO AKIRA
ITO TAKESHI
SANYO ELECTRIC WORKS