| 摘要 |
PROBLEM TO BE SOLVED: To provide a cavitation sensor more precise than the prior arts. SOLUTION: This cavitation sensor comprises a piezoelectric element (30) and an ultrasonic absorptive coating (20) arranged around a conduit (25). The conduit 25 contains the boundary determined by the piezoelectric element (30), and the ultrasonic absorptive coating (20) substantially transmits acoustic driving field frequency.
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