Self-adaptive acoustic imaging method

Abstract

The invention relates to a self-adaptive acoustic imaging method. The method includes the steps that acoustic wave signals are received after being transmitted at fixed focuses through an acoustic transducer array; focusing beamforming processing is carried out on the acoustic wave signals received by each array element in the acoustic transducer array to obtain acoustic radio frequency scanning line data; the focuses are used as virtual sources in synthetic aperture processing, tine delay from each virtual source to the spatial point is calculated by means of a cylindrical wave propagation model, and spatial point-by-point focusing is carried out on the scanning line data; self-adaptive weighting is conducted on the result of the spatial point-by-point focusing by the adoption of correlation coefficients or generalized correlation coefficients, the proportion of coherent components is increased, and the proportion of incoherent component is reduced; image transformation is carried out on all the scanning line data after self-adaptive weighting conducted on the result of the spatial point-by-point focusing to obtain images. According to the method, the lateral resolution and contrast ratio which are identical in depth are achieved, the number of sidelobes is effectively reduced, and therefore all-round improvement in acoustic imaging quality is achieved.

Description

technical field [0001] The invention relates to an acoustic array imaging technology, in particular to an adaptive acoustic imaging method. Background technique [0002] Synthetic aperture acoustic imaging is derived from synthetic aperture radar technology. Synthetic Transmitting Aperture Imaging (STAI) method can improve frame rate, signal-to-noise ratio and contrast compared with conventional acoustic imaging method and other synthetic aperture imaging methods. However, STAI has high requirements on imaging equipment hardware, especially on data transmission and processing speed, which limits the commercialization of synthetic aperture acoustic imaging to a certain extent. At the same time, there are still problems such as insufficient energy of transmitting array elements and too many times of transmitting in synthetic transmitting aperture imaging. The strategy of fixed-focus transmission and dynamic focus in reception in conventional acoustic imaging makes the image ...

AI Technical Summary

Problems solved by technology

Incoherent stacking can lead to increased sidelobe levels in some untargeted regions

Images