Machine vision teaching system and method for Newton ring experiment

Abstract

The invention relates to an image acquisition and processing technology, in particular to a machine vision teaching system and method for a Newton ring experiment. The system comprises a microscopic reading instrument, a Newton ring acquisition camera, a scale acquisition camera, a drum wheel acquisition camera, a hardware board card, a VGA display screen, a first support, a second support and a third support. The microscopic reading instrument is respectively connected with the Newton ring acquisition camera, the scale acquisition camera and the drum wheel acquisition camera through the firstsupport, the second support and the third support. The hardware board card is electrically connected with the Newton ring acquisition camera, the scale acquisition camera, the drum wheel acquisitioncamera and the VGA display screen. The system has visual image display, can quickly and accurately find the center of the Newton ring, effectively reduces experiment accidental errors, and converts the errors into system errors. Pixel-level scale measurement is carried out to obtain estimated bit data in manual measurement, so that the data precision is improved; and a buzzer gives an alarm, so that return errors caused by manual operation are avoided, and a data result is more accurate.

Description

Technical field[0001]The invention belongs to the technical field of image acquisition and processing, and in particular relates to a machine vision teaching system and method for Newton's ring experiment.Background technique[0002]In basic optics teaching experiments in general colleges and universities, the method of measuring the radius of curvature of the lens is as follows: a plano-convex lens with a large focal length is placed on a piece of flat glass, so that the convex surface is in contact with the plane, and an air film is formed near the contact point. . When irradiated vertically with a parallel quasi-monochromatic light, the light beam reflected on the upper surface of the air film and the light beam reflected on the lower surface meet and coherently on the upper surface of the film, forming a bright and dark ring-shaped interference pattern with the contact point as the center. It is a Newton ring. If the wavelength λ of the incident light is known, and the diameter of...

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Problems solved by technology

[0003] But in the actual measurement, because the experimental data can only be collected by moving the drum on the reading microscope, and the field of view of the reading microscope is small, the observer needs to keep his eyes close to the eyepiece for a long time, and stare at the extremely high-intensity sodium light source, which is very easy Causes observer visual fatigue and some degree of eye damage

Secondly, the observer needs to frequently adjust the drum on the right side of the instrument to measure multiple sets of data, and change the observation object between the eyepiece field of view, the scale, and the drum several times. It is very easy to cause ring count errors due to high work intensity and the experimental efficiency low

Finally, due to the visual error of the observer on the position of the stripes and the subjective estimation of the estimated reading position of the drum, the data obtained under the traditional experiment is unstable, and it is difficult to unify the conclusions of multiple measurements

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