SUPERSONIC TRANSDUCER DRIVE METHOD

摘要

[PROBLEMS] To provide a supersonic transducer drive method capable of improving the zero cross point detection accuracy and improving acoustic velocity measurement accuracy without being affected by reflection of the backing layer at the open side end surface. [MEANS FOR SOLVING PROBLEMS] A supersonic transducer (1) includes: a piezoelectric vibrator (2) having a piezoelectric body (31) sandwiched by two electrodes (4, 5); and a backing layer (32) arranged in contact with one (5) of the electrodes of the piezoelectric vibrator (2) and having the same acoustic characteristic impedance as the piezoelectric body (3). The supersonic transducer (1) is driven so as to satisfy the condition 2Th <= Td <= 6Th wherein Th represents the time required for propagation of the supersonic wave in the piezoelectric body (31) sandwiched by the two electrodes (4, 5) and Td represents the pulse width of the drive pulse driving the piezoelectric vibrator.