White light interference signal background light intensity real-time separation method

Abstract

The invention discloses a white light interference signal background light intensity real-time separation method. The method includes, after scanning begins, utilizing a CCD camera to record images ofn scanning positions to obtain light intensity change conditions of a specific pixel point in the images, and generating a set of background point sets for the pixel point; starting from the n+1th scanning positions, each frame image being collected by the CCD camera, for the n+1th scanning positions, judging whether update needs to be performed on an initial background model by the light intensity value and the initial background model of the pixel point after the initial background model of the pixel point is established; for the current scanning position after the n+1th scanning positions,judging whether the update and other steps need to be performed on a current background model according to the light intensity value and the current background model of the pixel point; and separating background light intensity according to the updated current background model, and extracting white light interference signals in real time. The method can effectively distinguish the background light intensity and the white light interference signals and meet real-time requirements, and is simple in calculating processes.

Description

technical field [0001] The invention belongs to the technical field of optical precision non-destructive testing, in particular to a method for real-time separation of background light intensity of white light interference signals. Background technique [0002] Optical precision non-destructive testing technology, as an important part of ultra-precision testing technology, has developed rapidly in recent years, and has huge application requirements in aerospace, automobile manufacturing, medical health, energy industry, and national defense security. , Measurement accuracy and application fields have made great progress. In this context, the demand for optical precision non-destructive testing in the industry is becoming more and more specific, often based on certain specific measurement objects, which also promotes the research work in this field to a more refined direction develop. [0003] As an important branch of optical nondestructive testing technology, white light ...

AI Technical Summary

Problems solved by technology

However, when measuring the surface of mechanical parts, the vertical measurement range often reaches more than a dozen or tens of microns, and the prolongation of the measurement time intensifies the influence of environmental scattering and unstable light sources.

At the same time, due to the larger surface roughness, the surface diffuse reflection is more serious

In this case, the background light intensity of the extracted white light interference signal is no longer a theoretical constant value, but presents a nonlinear intensity change. As a result, the original background extraction method becomes inapplicable. This also increases the possibility of error in the white light interference signal solution method

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