Research On Imaging Quality And Algorithm Of Ultrasonic Phased Array

In recent years,domestic ultrasonic phased array detection technology has been widely used in the industrial field and gradually formed a new research hotspot.Ultrasonic phased array inspection technology is based on a certain rule and delay time to stimulate the array elements in the transducer to generate ultrasonic beams,which can be deflected and focused after being launched.When the beam encounters a defect during propagation,the array element receives the echo signal returned from the defect and processes the echo signal by the receiving system and images.Because the imaging quality obtained under the receiving system is poor and the resolution is low,this paper analyzes the three parameters that affect the detection imaging,the focusing point and the synthetic aperture technology to improve the imaging quality and improve the imaging resolution.This article discusses three parameters that affect imaging: contrast,spatial resolution,and temporal resolution.The effect of spatial resolution on imaging is analyzed through simulation,obtaining the effective width of the reduced beam can improve the lateral resolution of the image,reducing the pulse width can improve the longitudinal resolution of the image.The diameter and depth of the focus point have a great influence on the resolution of the ultrasound detection imaging.Through MATLAB simulation,the system can reduce the time delay accuracy,increase the number of array elements in the transducer,and increase the spacing between array elements,which can improve the vertical resolution of the detection imaging,enhance the delay time accuracy of the system,narrow the deflection angle of the beam,increase the spacing of array elements in the transducer,and improve the lateral resolution of the detection imaging under dynamic focusing conditions.Keeping the delay time accuracy of the system constant,increasing the number of array elements can reduce the error sidelobes;When increasing the number of independent channels of the system,the depth of the focal zone and the diameter of the focus can be reduced,further improving the resolution of the detection imaging.Field ?ultrasound imaging toolkit was used to compare and analyze the synthetic transmit aperture(STA),multi-element synthetic transmit(MSA),and synthetic aperture sequential beamforming(SASB)algorithms based on synthetic aperture technology.The simulation results showed that the detection results under the SASB algorithm were better than those of STA and MSA,and the interference of ambient noise was reduced.When the apodization function is incorporated into the algorithm,the quality of the detection imaging can be increased.Under the condition of multipoint focusing,multi-point focus receiving,and the dynamic aperture technology,the resolution of detection imaging can be enhanced.By studying the minimum variance(MV)beamforming algorithm,the resolution of detection imaging can be improved.