基于角谱带宽扩展的水浸双层介质超声三维成像OA

Among the existing ultrasonic 3D reconstruction methods,frequency domain based imaging has the advantage of high efficiency,but its imaging resolution and quality are generally lower than those of the time domain based imaging.In this paper,a Fourier ultrasound three-dimensional imaging method utilizing one-dimensional phased array scanning and based on angular spectrum band-extension is presented.By the band-extension of angular spectrum,the spectrum overlap is avoided effectively and the resolution of 3D imaging is improved further.The fast Fourier transform(FFT)is applied to calculate the coherent weighting factor,so as to reduce the artifacts and noise in the imaging,obtain more accurate and clear imaging results,and accurately restore the size and shape of the actual defect.The experimental results show that the proposed method obtains imaging results closer to the true defect profile and outperforms the existing ultrasound imaging methods in terms of imaging quality and resolution.The proposed method provides a new idea for frequency domain three-dimensional imaging in engineering NDT(non-destructive testing),and it also provides a more efficient and accurate technical tool for precision detection in the field of engineering in the future.