Method for detecting internal defects of 3D (Three-dimensional) hard gold jewelry based on X rays

Abstract

The invention provides a method for detecting internal defects of 3D (Three-dimensional) hard gold jewelry based on X rays. The method comprises the following steps: S1, preparing multiple 3D hard gold samples of different thicknesses, respectively performing X-ray test on the samples by adopting an X-ray imagescope so as to obtain image gray values corresponding to the samples of different thicknesses under the same test condition, and establishing a linear function according to a corresponding relationship between the image gray values and the thickness; S2, measuring the actual thickness of to-be-detected 3D hard gold jewelry, and measuring through the X-ray imagescope so as to obtain an actual image gray value of the to-be-detected 3D hard gold jewelry; S3, calculating a corresponding reference image gray value under the actual thickness value according to the corresponding linear function relationship between the image gray value and the thickness; S4, comparing the actual image gray value of the to-be-detected 3D hard gold jewelry with the reference image gray value, wherein the product gold content is qualified if the relative difference value is less than or equal to 0.5%, otherwise the product is a suspicious defective product. According to the method, whether silver is included in the 3D hard gold jewelry can be preliminarily screened.

Description

technical field [0001] The invention relates to the technical field of precious metal detection, in particular to a method for detecting internal defects of 3D hard gold ornaments based on X-rays. Background technique [0002] "3D hard gold" is a new variety in the jewelry industry. Compared with traditional pure gold, it has both the high fineness of pure gold and high surface hardness, which is very popular among consumers. At present, the internal structure of 3D hard gold on the market is mostly thin-walled and hollow, and the gold content is 999‰. It is necessary to investigate whether the inner layer of the finished product is clean to remove silver, that is, to detect the gold content of the product. At present, X-ray fluorescence spectroscopy and chemical methods are commonly used by inspection and testing institutions. However, the inventor of the present invention found through research that the former method only detects the metal content of the surface layer of ...

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Problems solved by technology

However, the inventors of the present invention have found through research that the former method only detects the metal content of the 3D hard gold surface layer, but does not detect whether there is silver residue in the inner space; the latter method is completely effective. For the detection of damage, the content of the sample is determined after dissolution, which increases the loss of the sample, that is, the sample will be consumed regardless of whether there is a defect inside the sample.

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