Non-contact wave velocity extracting method of like surface acoustic wave of plating layer structure

A wave velocity extraction, non-contact technology, applied in the use of sound waves/ultrasonic waves/infrasonic waves to analyze solids, process detection response signals, etc.

Active Publication Date: 2012-07-25
BEIJING UNIV OF TECH
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  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to solve the problem of broadband continuous extraction of the surface wave velocity of the coating structure, and propose an advanced material wave velocity extraction method

Method used

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  • Non-contact wave velocity extracting method of like surface acoustic wave of plating layer structure
  • Non-contact wave velocity extracting method of like surface acoustic wave of plating layer structure
  • Non-contact wave velocity extracting method of like surface acoustic wave of plating layer structure

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Embodiment Construction

[0040] Below in conjunction with specific example, content of the present invention is described in further detail:

[0041] Step 1): Establish the formula for wave velocity extraction.

[0042] In the case of single frequency excitation / reception, figure 2 In the schematic diagram of the propagation of the leaky surface wave shown, the propagation time of the direct reflection echo I on the upper surface and the propagation time of the leaky surface wave L are respectively:

[0043] t 1 = 2 ( R - Vz ) v w - - - ( 1 )

[0044] t 2 = 2 ( R ...

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Abstract

The invention discloses a non-contact wave velocity extracting method of a like surface acoustic wave of a plating layer structure, and belongs to the technical field of non-destructive testing. In the research of the elastic characteristic of a plating / coating layer, under the condition that the characteristics of a substrate material are known, through the relationship of wave velocity and wavelength or frequency, namely a frequency dispersion curve, the elastic characteristic of the plating / collating layer can be inverted. The V (z) curve formed by the interferences of a drain like surfaceacoustic wave and a direct reflection wave namely a vertical wave comprises much information at the aspect of a material micro structure. According to the invention, based on a defocusing measurementsystem, a wide-frequency pulse is utilized to act as an excitation source, ultrasonic waves comprising multiple frequency components are received, and the V (z) curve of the material and vibration cycle thereof are obtained through an improved two-dimensional fourier transform technology, thus the extraction of the wave velocity of the like surface wave of the plating layer is realized. Accordingto the invention, the wave velocity of like surface acoustic waves of different materials can be extracted; and the wave velocity of the like surface acoustic waves in the wide-frequency range can beextracted, and a single-frequency pointwise mode is replaced; and the wave velocity of like surface acoustic waves in different frequency bands can be extracted.

Description

technical field [0001] The invention belongs to the field of non-destructive testing, and in particular relates to a method for non-contact wave velocity extraction of surface waves of coating structures. Background technique [0002] Plating / coating materials are widely used in aerospace, machinery, petroleum, chemical industry, nuclear power, micro-device and micro-manufacturing, etc., and their main functions are anti-corrosion, anti-friction, anti-oxidation protection. In addition to the widespread use of plating / coating in conventional mechanical equipment to delay corrosion, reduce wear, and prolong life on the surface of parts and components, there are many special surface functional requirements in special industries, such as anti-skid coatings on ship decks, Anti-corrosion coatings for marine seawater pipelines, stealth coatings for military aircraft, high-efficiency heat-absorbing coatings and photoelectric conversion coatings for solar energy equipment, etc. In ...

Claims

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Application Information

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IPC IPC(8): G01N29/46G01N29/07
Inventor 宋国荣吕炎何存富高忠阳柳艳丽吴斌
Owner BEIJING UNIV OF TECH
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