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Sound and ultrasonic nondestructive detection method

A non-destructive testing and ultrasonic technology, which is applied in the direction of using sound waves/ultrasonic waves/infrasonic waves to analyze solids, etc., can solve problems that affect detection accuracy, detection deviation, etc.

Inactive Publication Date: 2009-04-22
AEROSPACE RES INST OF MATERIAL & PROCESSING TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the ultrasonic detection method in the prior art, because it judges the existence of defects by receiving the ultrasonic waves reflected or penetrated by the inspected object, is easily interfered by various frequency signals, resulting in deviations in detection, thereby affecting detection accuracy

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Embodiment 1, an acoustic and ultrasonic nondestructive testing method of the present invention is used to detect whether the performance of a composite material (such as an adhesive layer) is good or bad, including two processes of calibration and actual measurement:

[0022] During the calibration process:

[0023]Acoustic or ultrasonic sensors are used to detect calibration composite materials of known density in the form of direct contact coupling or couplant coupling; acoustic or ultrasonic sensors are electroacoustic transducers made of piezoelectric materials or magnetostrictive materials; This embodiment adopts a single-probe electro-acoustic transducer, and its transmitter and receiver of the single-probe electro-acoustic transducer are mounted together, and the transmitter is controlled by a preset continuous wave or pulse signal sent by the waveform generator. Vibration is generated by excitation, and sound waves and ultrasonic waves are emitted. The receiver...

Embodiment 2

[0037] Embodiment 2, an acoustic and ultrasonic nondestructive testing method of the present invention is used to detect the thickness of plastics, including two processes of calibration and actual measurement:

[0038] During the calibration process:

[0039] Acoustic or ultrasonic sensors are used to detect calibration plastics of known thickness in the form of direct contact coupling or couplant coupling; acoustic or ultrasonic sensors are electroacoustic transducers made of piezoelectric materials or magnetostrictive materials; this The embodiment selects double-probe electro-acoustic transducers, double-probe electro-acoustic transducers, its transmitter and receiver are separated, and when the transmitter and receiver are on the same side of the measured medium, the transmitter is affected by the waveform generator. It is excited by a preset continuous wave or pulse signal to generate vibration, emit sound waves and ultrasonic waves, and the receiver is used to receive t...

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Abstract

The invention discloses a sound and ultrasonic nondestructive detection method, In the method, the nondestructive detection is carried out on the performance (such as adhesion) of materials such as composites by sound and ultrasonic sensors (such as an electroacoustic transducer made of piezoelectric material, magnetostrictive material, and the like) in a way of direct contact coupling or coupling by a couplant, the single and dual electroacoustic transducers can be excited in the form of continuous waves such as variable sine, pulse or triangle wave, a Phase Sensitive Detection (DSD) technique is adopts to process the change of amplitude and phase of feedback echo, and the detection effect of removing certain interference signals (namely retaining the truth and clearing up the false) can be achieved especially by frequency mixing processing of signals which are collected by different frequencies. The application mechanism of the method adopts currently advanced multifrequency and frequency spectrum analysis technique used for eddy detection to process the information obtained by the electroacoustic transducer, thus obtaining all detection characteristics which the existing noise and vibration detecting does not have.

Description

technical field [0001] The present invention relates to a non-destructive detection method using acoustic and ultrasonic sensors, in particular to a method for non-destructive testing of materials (such as bonding materials) properties (such as material density uniformity) using acoustic and ultrasonic sensors. 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, ultrasonic testing is one of the main methods of non-destructive testing. Ultrasonic testing (UT) is to use the ultrasonic wave to propagate in the material to be tested. Certain impact, through the detection of the degree and condition of ultrasonic impact to understand the material properties and structural changes. When an ultrasonic wave enters an object and encounters a defect, a part of t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N29/09G01N29/07G01N29/04
Inventor 陈颖林俊明何双起朱军辉
Owner AEROSPACE RES INST OF MATERIAL & PROCESSING TECH
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