DOPPLER TYPE ULTRASONIC FLOWMETER, FLOW VELOCITY CALCULATION UNIT, FLOW MEASUREMENT METHOD, AND COMPUTER PROGRAM

摘要

PROBLEM TO BE SOLVED: To provide a technology for measuring a flow velocity without being restricted by the Nyquist theorem, even when fluid to be measured has a high flow velocity or when a pipe diameter is large, concerning an ultrasonic Doppler flowmeter.;SOLUTION: A fluid velocity distribution measuring means for calculating a flow velocity distribution by processing a Doppler-shifted ultrasonic echo has a frequency conversion module for lowering a frequency of a received ultrasonic echo, a flow velocity distribution calculation module for calculating a flow velocity distribution of the fluid to be measured based on a converted echo lowered by the frequency conversion module, and an actual flow velocity calculation module for multiplying the flow velocity distribution calculated by the flow velocity distribution calculation module by a reciprocal of the lowered converted echo.;COPYRIGHT: (C)2010,JPO&INPIT