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Non-destructive detection method for plate-structure lamb wave based on virtual focusing of transducer array

A technology of transducer array and structured Lamb wave, which is applied in the processing of detection response signals and the use of sound waves/ultrasonic waves/infrasonic waves to analyze solids, etc., which can solve the complexity and cost increase of control array circuits, and the synchronization and delay of transmitted signals High requirements, complex phase-controlled delay transmitter circuit, etc.

Inactive Publication Date: 2010-05-05
BEIJING UNIV OF TECH
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Problems solved by technology

However, the phase-controlled delay transmitting circuit is extremely complex, and has high requirements on the synchronization and delay of the transmitting signal, and with the increase of the number of array elements, the complexity and cost of making the array-controlled circuit increase significantly. Therefore, its wide application is restricted. severely restricted

Method used

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  • Non-destructive detection method for plate-structure lamb wave based on virtual focusing of transducer array
  • Non-destructive detection method for plate-structure lamb wave based on virtual focusing of transducer array
  • Non-destructive detection method for plate-structure lamb wave based on virtual focusing of transducer array

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Embodiment Construction

[0046] Such as Figure 1-3 As shown, the specific steps of the Lamb wave nondestructive testing method for plate structures based on transducer array virtual focusing are:

[0047] 1) The plate structure to be tested is an aluminum plate of 1m*1m, and the dispersion curve of the plate structure is calculated. The selected excitation signal is a single audio signal modulated by a 10-period Hanning window. According to the propagation characteristics of Lamb wave in the dispersion curve, the frequency of the selected signal is 180kHz and the amplitude is 300mv.

[0048] 2) The number of array elements is selected to be 8, and the excitation signal of the selected frequency and amplitude is used to conduct ultrasonic guided wave experiments on the transducer array elements in a way of transmitting and receiving, and record the data received by the transducer array. Get n groups of time domain signals f n (t), where n represents the number of combinations of excitation and rece...

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Abstract

The invention relates to a plate-structure ultrasonic array imaging method based on the virtual focusing, belonging to field the non-destructive detection. The method comprises the step of processing receiving data of a transducer array to realize default pointing and focusing detection in any directions within the range of 360 degrees around the transducer, so that the problem of large-scale detection can be solved. When a wave beam of signals points and deviates to a direction in which a default position exists, all signals are focused at the default position, the energy of reflecting signals caused by the default is the strongest in the direction, thus the direction information of the default is obtained, and the signal-to-noise ratio is improved. Each sensor unit in a sensor array is connected with an independent and multi-channel excitation / reception conversion switch, so that the excitation and the reception of test signals are very flexible.

Description

technical field [0001] The invention relates to a large-scale and high-sensitivity defect detection method for a plate structure, in particular to a Lamb wave non-destructive detection method for a plate structure based on transducer array virtual focusing, which performs virtual focusing processing on the data collected by the transducer array , to achieve large-scale focus detection of plate structures. This method is mainly used for defect detection of plate structures such as pressure vessels and large storage tanks, and belongs to the field of non-destructive testing. Background technique [0002] Pressure vessels are important equipment in petroleum, chemical and other industries, and are also the infrastructure for national strategic oil reserves. Because it is filled with flammable, explosive, highly toxic or corrosive media, it has been subjected to high temperature and pressure for a long time, and it is a relatively high-risk special equipment. The failure mode i...

Claims

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Application Information

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IPC IPC(8): G01N29/06G01N29/44
Inventor 焦敬品杨敬何存富宋国荣吴斌樊尚春张力新
Owner BEIJING UNIV OF TECH
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