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Metal anti-fake identification method based on ultrasonic backscattering attenuation coefficient spectrum

A technology of ultrasonic backscattering and attenuation coefficient, which is applied in the direction of using sound wave/ultrasonic wave/infrasonic wave to analyze solids and prepare samples for testing. It can solve the problems of metal product damage, high cost, and complicated identification methods, and achieve low cost, The effect of fast recognition speed and easy online identification

Inactive Publication Date: 2015-02-04
SHAANXI NORMAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Chemical methods are relatively accurate, but the identification process and chemical reactions occur during identification, which will cause damage to metal products
There is also a mixture of the above identification methods for identification, but the mixed identification makes the identification method relatively complicated and the cost is high

Method used

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  • Metal anti-fake identification method based on ultrasonic backscattering attenuation coefficient spectrum
  • Metal anti-fake identification method based on ultrasonic backscattering attenuation coefficient spectrum
  • Metal anti-fake identification method based on ultrasonic backscattering attenuation coefficient spectrum

Examples

Experimental program
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Effect test

Embodiment 1

[0035] Using the 420 stainless iron metal product with a known mark as the reference sample, based on the ultrasonic backscatter attenuation coefficient spectrum, the anti-counterfeiting identification of the samples numbered 1#, 2#, and 3# are carried out. The specific method is realized by the following steps:

[0036] The 420 stainless iron metal products are mixed with the other two metal samples of 304 stainless steel and aluminum 2A12. They are cylindrical in shape, with a thickness of 15mm and a diameter of 47.1mm. The sample numbers to be tested are shown in the table 1 shown.

[0037] Table 1 Sample table of samples to be tested

[0038] Numbering

Material category

1#

304 stainless steel

2#

Aluminum 2A12

3#

420 stainless iron

[0039] (1) Pretreatment of reference sample

[0040] The reference sample of the known standard 420 stainless iron material was pretreated and processed into a cylindrical structure with a thickness of 15mm and a diameter of 47.1mm. The u...

Embodiment 2

[0068] In the metal anti-counterfeiting identification method based on the ultrasonic backscatter attenuation coefficient spectrum of this embodiment, the reference sample selected in step (1) is a cuboid with a thickness of 3 mm and a length × width of 40 × 30 mm, and the surface is polished and cleaned. . In step (2), choose a commercially available 5077PR pulse receiver / transmitter, connect it to the transceiver probe, Tektronix-DPO5034B digital oscilloscope, connect the oscilloscope to the computer, select a transceiver probe with a center frequency of 5MHz, and other operations and implementations Example 1 is the same. Step (3) Extract the scattered signal between the initial wave and the first bottom echo in the time domain waveform, intercept the local scattered signal f(t), and intercept the time domain width as T, and divide f(t) into N equal parts , N is 5, which can be adjusted according to the actual situation, corresponding to f(t i ), where 1≤i≤N, take any adjac...

Embodiment 3

[0071] In the metal anti-counterfeiting identification method based on the ultrasonic backscatter attenuation coefficient spectrum of this embodiment, the reference sample selected in step (1) is a rectangular parallelepiped with a thickness of 10 mm and a length × width of 30 × 25 mm, and the surface is polished and cleaned. . In step (2), select a commercially available 5077PR pulse receiver / transmitter, connect it to the transceiver probe, Tektronix-DPO5034B digital oscilloscope, connect the oscilloscope to the computer, select a transceiver probe with a center frequency of 20MHz, and other operations and implementations Example 1 is the same. Step (3) Extract the scattering signal between the initial wave and the first bottom echo in the time domain waveform, intercept the local scattering signal f(t) in the time domain scattering signal, and divide f(t) into 10 equal parts , Corresponding to f(t i ), where 1≤i≤N, take any adjacent two equal parts i and i+1, add Hanning wi...

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Abstract

The invention relates to a metal anti-fake identification method based on an ultrasonic backscattering attenuation coefficient spectrum. The fake identification on a metal material is completed through five steps of pre-treating a reference sample, acquiring a time-domain signal, calculating the attenuation coefficient spectrum of the reference sample, calculating self-relevance coefficients of the attenuation coefficient spectrum in the reference sample, and calculating relevant coefficients between the sample to be tested and the attenuation coefficient spectrum of the reference sample. By adopting the metal anti-fake identification method, a metal product does not need to be damaged and is not damaged in the identification process, so that non-destructive identification is achieved; in addition, compared with a conventional physical and chemical identification method, the result that whether the metal is true or fake can be obtained through independent identification, and moreover the identification result is accurate and reasonable, the identification method is relatively simple, the cost is low, the identification speed is fast, on-line identification is easy to achieve, and popularization and application are facilitated.

Description

Technical field [0001] The invention relates to the technical field of metal identification, in particular to a metal anti-counterfeiting identification method based on ultrasonic backscatter attenuation coefficient spectrum. Background technique [0002] The anti-counterfeiting identification technology of metal materials has a broad and very important application background. In industrial production, due to the gradual reduction of global resources, the price of precious metals has been rising. Unscrupulous companies may use alloys or other products like the craftsman who made crowns in ancient Greece. Fraudulent methods replace precious metals to reduce product costs and use shoddy products. If there is no scientific means for their anti-counterfeiting identification, it will cause major losses to production and life. Actually, it is used in many important applications such as metal precious cultural relics anti-counterfeiting identification, military equipment, etc. Metal ant...

Claims

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Application Information

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IPC IPC(8): G01N29/11G01N1/32G01N1/34
Inventor 贺西平张宏普刘小荣崔东
Owner SHAANXI NORMAL UNIV
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