An ultrasonic signal receiving and processing method based on signal section segmentation

Abstract

The invention discloses an ultrasonic signal receiving and processing method based on signal section segmentation. The ultrasonic signal receiving and processing method comprises the following steps:1, acquiring and synchronously uploading and receiving an ultrasonic echo signal; 2, determining wave crests and wave troughs; 3, removing extreme points; wherein a data processing device is adopted to segment the ultrasonic echo signal F (t), and the process comprises the following steps that 401, the time interval of adjacent extreme points is determined; 402, judging a segmentation point and determining the sampling time of the segmentation point; 403, performing signal segmentation judgment; 404, sorting the segmentation points; 405, signal segmentation. The method is simple in step, reasonable in design, convenient to implement and good in using effect, segmentation point judgment and segmentation point sampling time determination are achieved by conducting threshold judgment on the time interval of the adjacent extreme points, and ultrasonic echo signals are segmented according to the determined number of segmentation points and the sampling time of all the segmentation points.

Description

technical field [0001] The invention belongs to the technical field of ultrasonic flaw detection, in particular to a method for receiving and processing ultrasonic signals based on signal segment segmentation. Background technique [0002] Ultrasonic flaw detection (also known as ultrasonic testing or ultrasonic testing) is a non-destructive testing method that uses the differences in the acoustic properties of materials and their defects to reflect the ultrasonic wave propagation waveform and the energy changes of the penetration time to inspect the internal defects of materials. The principle of ultrasonic flaw detection is that the transmission loss of ultrasonic waves in solids is small and the detection depth is large. Because ultrasonic waves will reflect and refract on heterogeneous interfaces, especially they cannot pass through gas-solid interfaces. If there are pores, cracks, etc. in the metal. Delamination and other defects (gas in the defect) or inclusions, when ...

AI Technical Summary

Problems solved by technology

However, in practical applications, it often occurs that one ultrasonic echo signal contains multiple defects. The multiple defects are defects at multiple different positions on the measured object. The multiple defects are independent of each other and do not overlap each other. The relationship between defects is a combination relationship. At this time, the defect signals corresponding to multiple defects need to be segmented, otherwise the defect signal cannot be extracted, and the defect classification and identification cannot be performed.

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