Method and device for measuring smoothness of object via polarization imaging

Abstract

The invention discloses a method and device for measuring smoothness of an object via polarization imaging, and belongs to the technical field of photoelectronic imaging and computers. The method comprises the steps of 1, building a polarization imaging device that comprises a lighting source, a convergence lens, a rotary frame, a polarizing film positioned on the rotary frame, a camera and a controller from a target object end to an imaging end, placing the polarizing film in front of the camera, wherein the polarizing film is rotational, and both rotation of the rotary frame and imaging of the camera are controlled by the controller; and 2, building database of corresponding relation between polarizing angle graphs and smoothness, using the controller to control automatic polarization imaging and computing, and acquiring a smoothness index. The method and device are based on the integrated thought of optical imaging link computation, and can accurately determine the smoothness or roughness of the object to be detected. Optical hardware design is combined with software computation, the target object is directly faced, and the smoothness / roughness index level can be effectively given in real time.

Description

technical field [0001] The invention relates to the field of photoelectric imaging and computer technology, and more specifically, to a method and device for measuring the smoothness of an object by using polarization imaging. Background technique [0002] With the continuous improvement of modern manufacturing and processing technology, the requirements for the measurement of surface smoothness / roughness of various parts or objects are getting higher and higher. One is speed, the other is accuracy, and the third is cost. Optical methods have a long history of measuring smoothness, especially the non-contact method is the goal of research, because non-contact will not damage the surface of the object. Generally, optical indirect measurement methods are divided into scattering method, speckle method, optical stylus method, interference diffraction method, optical fiber sensing method, etc., but the basic idea is to determine the surface smoothness or roughness. [0003] Typ...

AI Technical Summary

Problems solved by technology

[0005] The object of the present invention is to provide a method and device for measuring the smoothness of an object using polarization imaging, and then assist a simple post-processing method and device, effectively avoiding long calculation time in the post-processing process, and performing polarization optics first in the imaging process. Information analysis, which is based on the combination of imaging hardware and algorithm software calculations, uses the economical benefits of polarizers in the visible light band and the control and simple calculations of single-chip microcomputers, aiming to solve the current optical non-contact measurement methods that lead to complex operations and time-consuming, etc. problem, enabling smoothness / roughness determination

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