Nondestructive detection method for thickness of nacrelayer of pearl

Abstract

The invention discloses a nondestructive detection method for the thickness of a nacrelayer of a pearl. The nondestructive detection method comprises the following steps of placing a standard sphere between an X-ray radiation source and an imaging plane to allow a sphere center of the standard sphere to be positioned on a reference straight line; irradiating the standard sphere through the X-ray radiation source to acquire an image of the standard sphere on the imaging plane, measuring the radius R0 of the image of the standard sphere, and calculating a proportion coefficient mu=r0 / R0, wherein r0 is the radius of the standard sphere; placing the pearl to be detected between the X-ray radiation source and imaging equipment to allow the sphere center of the pearl to be detected to be positioned on the reference straight line; irradiating the pearl to be detected through the X-ray radiation source to acquire an image of the pearl to be detected on the imaging plane, wherein the image of the pearl to be detected comprises an image of a pearl kernel and an image of an annular nacrelayer; measuring the radius R1 of the image of the pearl to be detected and the radius R2 of the image of the pearl kernel, wherein the radius r1 of the pearl to be detected is equal to mu R1, the radius r2 of the pearl kernel is equal to mu R2, and the thickness r of the nacrelayer is obtained by subtracting r2 from r1. Errors in a calculation process based on the nondestructive detection method are controllable, and a measurement result is more accurate.

Description

technical field [0001] The invention relates to a method for detecting the pearl bead layer, in particular to a non-destructive detection method for the thickness of the pearl bead layer using an X-ray radiation source. Background technique [0002] A pearl is a small opaque sphere, and it is easy for people to judge the color, luster, roundness, size and smoothness of the pearl from the appearance. If you want to understand the internal structure of pearls, you usually have to drill holes or dissect them, but doing so will destroy the pearls. [0003] With the development of computer technology, people mainly use X-ray technology and optical coherence tomography technology to carry out non-destructive testing of pearls. These new achievements are applied in the field of pearl detection, which effectively solves the problem of "pearl identification and quantitative detection". However, the current X-ray and optical coherence tomography technology has some defects. Specific...

AI Technical Summary

Problems solved by technology

However, the current X-ray and optical coherence tomography technology has some defects. Specifically, the general X-ray detection technology directly calculates the radius of the pearl through the image of the measured pearl, and there are errors in the measurement of various parameters in this process. , especially some parameters such as the distance from the ray source to the inner point B of the pearl cannot be measured, which makes it difficult to measure the radius r of the measured pearl 0 , the calculation result error cannot be controlled (such as figure 1 shown)

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