A clamp-on type acoustic doppler current profiler

Details A clamp-on type acoustic doppler current profiler A clamp-on type acoustic doppler current profiler

G - Physics

01

F

G01F 1/66 (2006.01) G01S 15/58 (2006.01)

Patent

CA 2488009

To eliminate, among ultrasound echoes "caused" by two measurement lines of a longitudinal wave and a shear wave propagating in a piping, the ultrasound echo based on the longitudinal wave, thereby providing the measurement of a flow rate profile and/or a flow rate with a higher accuracy. A clamp-on type acoustic Doppler current profiler by which ultrasound is transmitted from an ultrasound transducer, provided external to a piping, to fluid within the piping to measure the flow rate profile of the fluid by using a characteristic in which the frequency of ultrasound is changed by the Doppler effect when reflected by a reflector in the fluid. The ultrasound oscillator is fixed to the wedge at an inclination such that, when the acoustic velocities of the longitudinal wave and the shear wave of the ultrasound propagating in the piping are equal to or higher than the acoustic velocity of the longitudinal wave in the wedge, the incidence angle of the ultrasound transmitted from the wedge into the piping is equal to or higher than the critical angle of the longitudinal wave that is determined by the acoustic velocity of the longitudinal wave in the wedge and the acoustic velocity of the longitudinal wave in the piping and is equal to or lower than the critical angle of the shear wave that is determined by the acoustic velocity of the longitudinal wave in the wedge and the acoustic velocity of the shear wave in the piping.

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