| 摘要 |
PROBLEM TO BE SOLVED: To provide a bubble detection device which detects the presence and absence of the generation of bubbles.SOLUTION: A bubble detection device includes: a vibrator 10 which transmits an ultrasonic wave with a prescribed frequency to bubbles being a measuring target and receives a reflection wave from the bubbles to convert it into an electric signal (second electric signal 24); and a control unit 20 which drives the vibrator 10 and processes the second electric signal 24. The control unit 20 calculates a frequency variation amount of the second electric signal 24, compares the calculated frequency variation amount with a preset frequency variation amount and detects the presence and absence of the bubbles, the size and density of the bubbles in accordance with a comparison result. |
