Method for measuring refractivity of transparent substance

Abstract

The invention provides a method for measuring refractivity of a transparent substance. The method includes the steps: (1) placing a light source O with an adjustable size at the bottom of a sample cell containing the transparent substance to be measured; (2) emitting light upwards by the aid of the light source O at the bottom of the sample cell and forming a circular dark zone by the aid of two circles in overhead view from the upper side of the sample cell; and (3) taking a chord from the circular dark zone, leading the chord to penetrate through the two circles, finally, calculating the refractivity of the transparent substance by the aid of the length of the chord, or adjusting the size of the light source by the aid of a diaphragm, and accordingly, calculating the refractivity of the transparent substance by measuring the size of the diaphragm when a dark ring just disappears. A coarse scattering surface is arranged at the bottom of the sample cell. The method can be used for measuring refractivity without scope limitations, and the refractivity of the transparent substance can be dynamically measured in real time.

Description

technical field [0001] The invention relates to a method for measuring the refractive index, in particular to a method for measuring the refractive index of transparent substances. Background technique [0002] Refractive index is an important physical quantity that characterizes the optical properties of objects. There are many ways to measure the refractive index of an object, and the total inversion principle is a relatively simple and feasible method to measure the refractive index of an object. [0003] There are mainly four methods in the prior art: [0004] 1) Using the minimum deflection angle method of the spectrometer. [0005] First, make the object to be tested into a prism shape, measure the vertex angle of the prism, and then inject a beam of light into one side of the prism, and the light will exit on the other side after passing through the prism. Angle, and then calculate the refractive index according to the law of refraction. Defect: The sample to be t...

AI Technical Summary

Problems solved by technology

Defect: The sample to be tested needs to be made into a prism shape, which changes the shape of the sample and is not conducive to rapid measurement

Defect: The refractive index measured by the Abbe instrument has a certain range. This range depends on the refractive index of the optically dense medium in the instrument. In addition, the Abbe instrument only measures the refractive index of yellow light.

Defects: This method needs to find interference fringes, the operation is complicated, and it is suitable for solid objects with parallel upper and lower surfaces and uniform thickness

Disadvantages: Using fiber optic gratings to measure, the cost is relatively high, the measurement principle is relatively complicated, the measurement requires certain professional skills, it is not easy to promote, and it is only suitable for liquid objects to be measured

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