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Surface and near-surface stratification chromatography for functional gradient material

A functionally graded material, near-surface technology, applied in material excitation analysis, generation of ultrasonic/sonic/infrasonic waves, etc., can solve the problem that functionally graded materials cannot provide reliable surface and near-surface performance parameters, etc., and achieves simple and fast optical path adjustment. The effect of fast and accurate data inversion and high application prospect

Inactive Publication Date: 2007-10-17
NANJING UNIV
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Problems solved by technology

At present, traditional mature detection methods such as scanning electron acoustic microscope (SEAM), acoustic microscope, ultrasonic detection system, etc. cannot provide reliable surface and near-surface performance parameters for functionally graded materials.

Method used

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  • Surface and near-surface stratification chromatography for functional gradient material
  • Surface and near-surface stratification chromatography for functional gradient material
  • Surface and near-surface stratification chromatography for functional gradient material

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Embodiment Construction

[0020] Fig. 1 is the working principle diagram of the surface and near-surface layered chromatography of the functionally graded material of the present invention, and the working process of the present invention is elaborated below in conjunction with accompanying drawing:

[0021] 1) First, use computational holography to calculate the phase distribution diagrams required to generate various grid spacings on the surface of functionally graded materials according to the wavelength of the laser and the spatial position of the target, and use LabView, C, Visual C++, etc. to write the call of each phase diagram Control software (the subroutine block diagram is shown in Figure 2(a)), and displayed on a transmissive spatial phase modulator (such as a transmissive LCD); when the laser passes through the phase modulator (as shown in Figure 3), A thermal grid distribution with a grid spacing of λ (as shown in Figure 4) is generated on the surface of the functionally graded material; w...

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Abstract

The invention discloses a delamination chromatography method for characterization and analysis of surface and near surface property of function gradient material, which establishes surface and near surface analysis chromatography of the function gradient material according to transmission property of sound surface wave with different frequency on the function gradient material by utilizing penetrability of sound surface wave. The delamination chromatography method includes steps: 1. modulating pulse laser by modulating space phase technique and generating sound surface wave with different wave length on detected material by calculation hologram technique; 2. measuring sound surface wave signal generated by excited micro-region and obtaining corresponding sound dispersion characteristics by common optical detection instrument; 3. training neuron network according to transmission model of sound surface wave in multi-layer material and realizing material property characterization along micro-region depth direction by the trained neuron network; 4. realizing delamination chromatography of surface and sub-surface elasticity property of function material by scanning of exciting source and detecting light point by point.

Description

1. Technical field [0001] The invention relates to a method for analyzing the performance of a material, in particular to a layered chromatography method for the surface and near surface of a functional gradient material. 2. Background technology [0002] Functionally graded materials such as surface hardening have been widely used in modern production fields such as aviation, ships, and automobiles. How to quickly obtain the performance parameters of materials is one of the research hotspots in the detection field. The penetrability of sound to dielectric materials provides the possibility for the detection of micro-area physical properties and inhomogeneity of materials, as well as the non-destructive observation of internal structures and defects. At present, traditional mature detection methods such as scanning electron acoustic microscope (SEAM), acoustic microscope, ultrasonic detection system, etc. cannot provide reliable surface and near-surface performance parameter...

Claims

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Application Information

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IPC IPC(8): G01N29/34G01N21/63
Inventor 徐晓东刘晓峻吴大建吴雪炜程营王敬时
Owner NANJING UNIV
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