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Simple method for measuring refractive indexes of colloid, solid and liquid

A measurement method and technology of refractive index, applied in the field of physical parameter measurement of materials, can solve problems such as instability of scattering sources

Inactive Publication Date: 2020-03-10
张怡宁
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  • Application Information

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Problems solved by technology

But this scattering source is unstable, a gust of wind blows away the dust and smoke, and the laser beam disappears again

Method used

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  • Simple method for measuring refractive indexes of colloid, solid and liquid
  • Simple method for measuring refractive indexes of colloid, solid and liquid
  • Simple method for measuring refractive indexes of colloid, solid and liquid

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Embodiment Construction

[0016] In the following measurements, the laser wavelength is 650nm.

[0017] The measurement of each sample was repeated five times, and their refractive index average and average error were obtained.

[0018] 1. Refractive Index Measurement of Gelatin Gels

[0019] The gelatin powder is put into pure water and soaked for more than 2 hours according to the weight percentage concentration of the gelatin aqueous solution being 11%, so as to fully absorb water and swell. Then heat through water to make the temperature of the sol be 75°C. Pour into measuring molds and refrigerate. After gelling, take it out and let it cool to room temperature. The average value and error of the measured refractive index are: n=1.415±0.003, and the measurement temperature is 24°C.

[0020] 2. Refractive Index Measurement of Agar Gels

[0021] Mix the agar aqueous solution with a concentration of 2% by weight, put the agar powder into a small amount of pure water and soak for more than 2 hours...

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Abstract

The invention relates to a simple method for measuring the refractive indexes. An artificial scattering surface which is smooth, not easy to deform and good in laser scattering is grazed by a laser beam, and an incident laser beam of a measured material and an air interface is displayed. In a colloid, a refracted laser beam is displayed by utilizing a Tyndall effect of the colloid; and in a measured transparent solid and transparent liquid, the refracted laser beam is displayed through grazing of the refracted laser beam to a frosted observation surface. The reflected laser beam on the interface also passes through the artificial scattering surface and is displayed together with the incident beam at the same time. Based on the principle that the incidence angle is equal to the reflection angle, the angular bisector of the included angle between the incident light and the reflected light is the normal of the measured material and the air interface. Therefore, the incidence angles and the refraction angles of the colloid, the transparent solid and the transparent liquid are measured, and the refractive indexes of the colloid, the transparent solid and the transparent liquid are calculated according to the refraction angle law.

Description

technical field [0001] The invention is a technique for measuring physical parameters of materials, specifically a method for measuring the refractive index of colloids, solids and liquids. Background technique [0002] Refractive index is an important physical parameter to describe the properties of materials. There are pin insertion method, minimum deviation angle method, interferometry and Abbe refractometer to measure the refractive index. The insertion pin method requires the measurement sample to be a thick plate with two parallel sides; The spectrometer measures the minimum deflection angle. Obviously, its measurement object can only be a transparent solid; in the interferometry, such as the Michelson interferometer, the measurement object is a film and a transparent sheet, and the operation of the interferometer is difficult, so it is also proposed for the experimenter Higher requirements; the Abbe refractometer is the most classic method for measuring the refractiv...

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Application Information

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IPC IPC(8): G01N21/41
CPCG01N21/41
Inventor 张怡宁
Owner 张怡宁
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