Ultrasound phase-control emission fine delay control method based on digital wave-shape phase difference

Abstract

The key point of the ultrasonic phased array technique is the control of phase difference (time delay); all multi-phased control effects are based on phased time delay such as dynamic focusing and deflection of acoustic beams, forming of digital acoustic beams and the like, which depend on the realization of phased time delay; the precision of the phased time delay directly affects the whole performance of an ultrasonic phased system; the invention provides a novel method used for phase fine regulation; the method sufficiently utilizes the advantage of waveform motivation type, and adopts the method of digital waveform phase difference to realize fine delaying of phased emission, thus improving the phased emission delaying resolution. The digital waveform phase difference is the phase difference of digital waveforms of the same frequency memorized in waveform SRAM of different passages; and the digital waveform data is changed into analog excitation signal after D / A conversion and the digital waveform phase difference is converted into the phase difference of the analog excitation signal.

Description

technical field [0001] The invention relates to an ultrasonic phased array technology, in particular to an ultrasonic phased array transmission delay technology. Background technique [0002] The key digital technology in the ultrasonic phased array system mainly refers to the space-time control of the beam, using advanced digital electronic technology and microcomputer technology to precisely control the phased beam in the transmitting / receiving state to obtain the best beam characteristics. These key digital technologies include phased delay, dynamic focus, dynamic aperture, dynamic apodization, coded emission, acoustic beam forming, etc. [0003] The ultrasonic phased array system uses array transducers, and by adjusting the phase delay of the transmitted / received signals of each array element, the curvature, pointing, aperture, etc. of the synthetic wave front can be controlled to achieve beam focusing, deflection, beam forming, etc. Phase control effect, forming a clea...

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Problems solved by technology

Another method is to interpolate the sampled data in the time domain to obtain an N-fold dense output sequence to reduce the quantization delay. This requires a high amount of computation and memory support, and the delay quantization error is still not small enough.

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