Multifrequency phased array ultrasonic Doppler flow detection system and method

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.