Ultrasonic nondestructive testing device and method

Abstract

The invention relates to an ultrasonic nondestructive testing device. The ultrasonic nondestructive testing device comprises a probe, a signal transmitting module, a signal receiving module, a processing module, a storage module and a control module, wherein the signal transmitting module is used for exciting the probe to generate ultrasonic waves; the probe is used for transmitting and receivingultrasonic signals; the signal receiving module is used for receiving the reflected ultrasonic signals from the probe; the processing module is provided with an amplifying circuit, a filter circuit, an analog / digital (A / D) conversion circuit, an envelope signal conversion unit, a scanning unit and a data fusion processing unit; the storage module is used for storing signals processed by the processing module; the scanning unit is provided with a software dynamic gate with continuously set time slots; and the software dynamic gate is used for monitoring ultrasonic signals of a sample to be tested at positions with different depth. The ultrasonic nondestructive testing device overcomes the contradiction between thickness direction subdivision and plate thickness direction coverage rate which cannot be overcome by other detection methods. For a nonuniform-thickness laminated board particularly, the ultrasonic nondestructive testing device guarantees detection rate and guarantees subdivision of the thickness direction.

Description

technical field [0001] The invention relates to an ultrasonic non-destructive testing device and method, in particular to an ultrasonic non-destructive testing device and method for testing non-uniform thickness samples to be tested. Background technique [0002] Nondestructive testing (nondestructive test), referred to as NDT, is a technology that detects its performance, quality, and internal defects without destroying or damaging the object under test. Among the existing non-destructive testing methods, the conventional methods mainly include radiographic testing (RT) method, ultrasonic testing (UT) method, penetrant testing (PT) method, magnetic particle testing (MT) method, eddy current testing (ET) method, and of course There are unconventional ones, such as microwave detection method, potential detection method, etc. [0003] Ultrasonic testing (UT) is to use the ultrasonic wave to propagate in the material to be tested, the acoustic characteristics of the material a...

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Problems solved by technology

[0006] The purpose of the present invention is to overcome the technical problem that the echo amplitude of the defect echo in the defect area is similar to that of the bottom wave echo amplitude of the same thickness in the non-defect place, which makes it difficult to identify the defect and leads to missed detection, especially to solve the problem of non-uniform The problem of ultrasonic non-destructive testing of test samples is favored, and the echo signals at different depths are monitored by setting continuous software dynamic gates, and then the attenuation of the echo signals is compensated according to the thickness of the plate, and finally the scanning imaging of each software gate is processed through data fusion , and finally realize the ultrasonic non-destructive testing of non-equal-thickness laminates, especially carbon fiber reinforced resin-based composite non-equal-thickness laminates

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