Ultrasonic detection method and system

Abstract

The invention provides an ultrasonic detection method and system based on signal matching technology. The method comprises 1) the step of presetting the waveform of the sense signal based on signal matching technology; 2) the step of calculating electric excitation signal according to the preset waveform of the sense signal, and generating ultrasonic sense signal by an ultrasonic transducer excited by the electric excitation signal; and 3) the step of receiving the sense signal with target information having the waveform preset in the step 1) by using the ultrasonic transducer. The ultrasonic detection system comprises a signal synthesis unit, an ultrasonic transducer, and an amplifying reception unit. The invention has the advantages that, according to actual detection requirement, desired special sense signal for improving the system performance and implementing detection aim can be obtained; the invention facilitates the development of the ultrasonic detection method and technology, and the problem of irrealizable detection in prior art is solved; by adopting time-domain deconvolution algorithm, some information like phase will not be lost, so as to ensure the accuracy of sense signal; complexity degree of calculation is lowered, which is favorable for the actual control; and the hardware system is simple and easy to operate.

Description

technical field [0001] The invention belongs to the technical field of ultrasonic detection, in particular, the invention relates to an ultrasonic detection method and system based on signal matching technology. The signal matching technique here refers to the calculation and application of the emission signal matched with the detection system performance (such as high sensitivity or high resolution) or detection purpose (such as a specific type of defect or medium). Background technique [0002] Ultrasonic testing is a non-destructive testing method that uses ultrasound as an information carrier to detect internal defects or targets, measure its physical and mechanical properties, and analyze its organizational structure to evaluate the quality of the medium without damaging the object. In industry, there are ultrasonic non-destructive testing, ultrasonic rock mass detection and ultrasonic industrial measurement; in a broad sense, there are ultrasonic diagnosis in medicine....

AI Technical Summary

Problems solved by technology

[0005] However, the above studies have not been well continued, nor have they been applied to actual testing.

There are two reasons: one is that the signal design calculation is based on division in the frequency domain, and a lot of useful information is lost during the processing, resulting in poor results

If the zero-filling method is used to deal with the case where the denominator cannot be zero, or the Hamming window function is used to replace the ideal delta function whose numerator is infinite bandwidth, it will inevitably bring a lot of deviation to the processing results

Second, the equipment at that time was mainly realized by hardware, and its excitation waveform was limited, which was far less flexible and convenient than the current digital equipment.

Images