Patent ID: 7806003

Claim:
A doppler type ultrasonic flow meter for measuring volumetric flow of a measurement object fluid using doppler shift of ultrasound, comprising: a pair of ultrasonic transducers for transmitting ultrasound and receiving of an ultrasound echo of reflected ultrasound, the pair of ultrasonic transducers being disposed on the outside of a pipe having the measurement object fluid flowing therethrough, and being disposed symmetrically on an extension line of a measurement line for performing measurement of doppler shift; and calculating circuitry for calculating at least (a) a first flow profile based upon an ultrasound echo received when a first of the pair of ultrasonic transducers is transmitting ultrasound, and (b) the volumetric flow of the measurement fluid based upon the first flow profile, wherein the first flow profile is for the side opposite, with respect to the center axis of the pipe, the side on which the first of the pair of ultrasonic transducers is disposed.