Auxiliary experiment device for measuring radius of curvature of lens through Newton ring

Abstract

The invention provides an auxiliary experiment device for measuring the radius of the curvature of a lens through a Newton ring. According to the device, eight LED monochromatic light sources with different wave lengths are adopted, light emitted by the light sources is coupled into a light guide fiber, and an outlet is provided with a beam expanding lens and frosted glass. A CCD camera is arranged in front of an eye lens of a reading microscope, the CCD camera is connected with a displayer through an interface, and the Newton ring can be directly displayed on the displayer. The LED monochromatic light sources with different wave lengths are turned on and used as incident light sources of an experiment, a Newton ring device is lightened after the light is reflected by a semi-reflective mirror, the Newton ring is displayed on the displayer through the CCD camera, and measurement can be conducted by using the reading microscope. According to the auxiliary experiment device, LEDs are used as the monochromatic light sources, the service life is long, preheating is not needed when experiments are conducted, lightness adjustment is convenient, eight monochromatic lights with different wave lengths can be obtained, the experiments are rich in content, student data are not prone to being similar, the Newton ring is directly displayed on the displayer through the CCD camera to be observed and measured, convenience is brought, and effort is saved.

Description

technical field [0001] The invention relates to a university physics experiment device, in particular to an auxiliary experiment device for measuring the radius of curvature of a lens with a Newton's ring. Background technique [0002] Using the upper and lower surfaces of the transparent film to reflect the incident light sequentially, the amplitude of the incident light will be decomposed into two parts with a certain optical path difference. If the optical path difference between the two reflected lights when they meet depends on the thickness of the film that generates the reflected light, then The film thickness corresponding to the same level of interference fringes is the same, which is the so-called equal thickness interference. The Newton ring device is formed by placing the convex surface of a plano-convex lens with a large radius of curvature on an optical flat glass (flat crystal). A very thin air film is formed between the convex surface of the plano-convex lens...

AI Technical Summary

Problems solved by technology

[0004] First, the driving power supply of sodium light lamps is relatively complicated, and the stability requirements are relatively high, and it is easy to be damaged, and it must be warmed up for more than 5 minutes to work normally. Once it is turned off, it cannot be turned on immediately, otherwise the lamp is very easy to burn out

[0005] Second, the brightness of the sodium lamp is not easy to adjust. In the experiment, the intensity of the incident light can only be adjusted by changing the distance of the light source.

[0006] Third, there is only one wavelength of monochromatic light, the experimental content is single, and the data of students is likely to be the same

[0007] Fourth, it is very easy to get tired when using a reading microscope to observe and measure directly through the human eye, and it is easy to confuse the series of Newton's rings, which affects the accuracy of the measurement results

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