The invention discloses a multifrequency
phased array ultrasonic Doppler flow detection
system and a multifrequency
phased array ultrasonic Doppler flow detection method. The
system comprises a central control processor, a
frequency synthesizer, a transmitting part, a receiving part and a display, wherein the transmitting part comprises a
transmitter, a power distribution network, a
beam control network, a first beam subarray and a second beam subarray; the receiving part comprises a first beam
receiver, a second beam
receiver, a multi-beam forming network and a
signal processor. The
system is characterized in that the central control processor is respectively connected with the
frequency synthesizer, the
transmitter, the power distribution network, the
beam control network, the first beam
receiver, the second beam receiver, the multi-beam forming network and the
signal processor. In the detection method of the system, beam deflection and dynamic focusing are realized through the
phased array technology, multi-directional and multi-depth positions can be measured on the cross section of an integral pipeline, and by a mode of adjusting
beam scanning dynamically, the
processing timeof the
beam scanning is reduced, and the measuring accuracy is improved.