Space coding ultrasonic array ultrafast detection and positioning system and method

Abstract

The invention discloses a space coding ultrasonic array ultrafast detection and positioning system and method, and the method comprises the steps: a space coding ultrasonic probe array is firstly formed through N ultrasonic sensor array elements which are arranged at different intervals, and the intervals between any two adjacent array elements and the intervals between any two non-adjacent arrayelements are different; and then each array element of the sensor array is simultaneously excited to generate N ultrasonic pulses propagating around, so that pulse sequences P theta with different time intervals delta ti = di * cos theta/c are generated in different directions, and c is the propagation speed of the ultrasonic waves. The ultrasonic wave propagating in a certain direction is reflected by a detection target to form a pulse sequence echo with the same code as the incident wave; the pulse sequence echo is received by the ultrasonic sensor array to be used as echo signals; finally,correlation calculation is conducted on the received signals and incident wave signals in different directions, the distance and direction information of echo signals can be obtained according to theoccurrence time of correlation peak values and the directions of incident waves, and therefore ultrafast detection and positioning can be conducted on a target through a single measurement signal.

Description

technical field [0001] The invention relates to the technical field of detection and positioning, in particular to an ultrafast detection and positioning system and method of a space-coded ultrasonic array. Background technique [0002] Phased array ultrasonic testing methods are widely used in underwater detection, industrial non-destructive testing and medical ultrasonic imaging. The traditional phased-array ultrasonic detection method usually adopts linear scanning, and multiple ultrasonic focused transmissions can obtain a complete image and realize the detection and positioning of the measured target. However, with the emergence of real-time detection and tracking of underwater high-speed moving targets and online detection of internal defects of fast-moving objects, dozens or even hundreds of frames of images need to be refreshed per second. And imaging speed puts forward higher requirements. The ultrasonic imaging method based on plane wave is currently the main ult...

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However, this method is based on collimated plane waves, the beam angle is small, the area covered

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