ULTRASONIC FLOWMETER AND ITS CONTROL METHOD

摘要

PROBLEM TO BE SOLVED: To provide an ultrasonic flowmeter capable of performing high-precision measurement even if a velocity distribution changes. SOLUTION: This ultrasonic flowmeter is provided with a first ultrasonic transducer 71 transmitting ultrasound and disposed so that a passage in which the ultrasound spreads is formed in a flow passage 73 of a fluid, a second ultrasonic transducer 72 including a piezoelectric material having first and second principal surface facing each other, a plurality of segmented electrodes provided in the first principal surface respectively and a piezoelectric device having a common electrode provided in the second principal surface and disposed to receive the ultrasound transmitted from the first ultrasonic transducer 71, a signal strength converter part 75 amplifying or attenuating a plurality of input signals received by the common electrode and the plurality of segmented electrodes at different rates respectively and an addition part 76 adding the plurality of the input signals converted by the signal strength converter. The fluid flow moving in the passage is measured based on the signal obtained by the addition part 76. COPYRIGHT: (C)2005,JPO&NCIPI