A 2D device for improving the measurement accuracy of cylinder diameter and its measurement method

Abstract

The invention discloses a 2D device for improving the measurement accuracy of a cylinder diameter and a measurement method thereof. The 2D device for measuring the diameter of a cylinder specifically includes a visual inspection camera, a telecentric lens, a carrier and a Object stage, light source, the optical axis of the camera of the visual inspection camera coincides with the central axis of the telecentric lens, the object stage is a uniform light-transmitting plane, the light source is projected upward from the bottom of the object stage, and the visual inspection The camera optical axis of the camera is absolutely perpendicular to the imaging plane. The measurement method of the present invention obtains the surface equation by fitting the error data obtained from the analysis of the optical axis verticality error, the calculation of the inclination angle of the stage, and the measured cylinder diameter value, and accurately analyzes and processes the measurement error value to compensate for the error. Provide accurate calculation services. After the visual inspection camera automatically focuses, the height difference parameters of the cylinder to be tested are obtained without manual input.

Description

technical field [0001] The invention belongs to the technical field of precision optics, and in particular relates to a 2D device and a measurement method for improving the measurement accuracy of a cylinder diameter. Background technique [0002] Visual measurement refers to the application of computer vision to the precise measurement and positioning of spatial geometric dimensions. Visual measurement has become an innovative means of dimension measurement of mechanical parts due to its advantages of continuity, non-contact and easy automation. [0003] The current method of measuring the diameter of a cylinder based on machine vision is: fix the camera at a suitable position on the bracket so that the optical axis of the camera is perpendicular to the reference plane; place the cylindrical object to be measured on the reference plane and take an image; according to the captured image, Calculate the image space size of the diameter of the cylinder; based on the lens camer...

AI Technical Summary

Problems solved by technology

[0004] When the above method detects the diameter of the cylinder, the diameter error is large, and there is a certain process error in fixing the relative position of the camera optical axis and the reference plane, that is, the perpendicularity between the camera optical axis and the reference plane cannot be accurately guaranteed, resulting in focus point differences. The measurement error of the diameter of the cylinder increases, the measurement is not accurate enough, and the detection accuracy is low

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