Ultrasonic Array F-SAFT Imaging Method With PSM

With the development of industrial manufacturing level, the requirements for industrial nondestructive testing are becoming higher and higher. In order to achieve faster and more accurate detection, an ultrasonic imaging algorithm method of frequency domain synthetic aperture focusing technique (F-SAFT) based on phase shift migration (PSM) is proposed here. Firstly, the acquired time-domain array signals are processed with two-dimensional Fourier transform. Then the sound field is reconstructed with PSM. Finally, the two-dimensional inverse Fourier transform is used to image the detection area layer by layer. The experimental results show that the resolution and signal-to-noise ratio (SNR) of the imaging results are greatly improved after processing by the proposed method. Compared with the processing results of the time domain synthetic aperture algorithm, the SNR is increased by 23.37dB and the calculation time is saved by 69.43% under the same experimental conditions.