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A method for measuring liquid refractive index dispersion and its application

A liquid refractive index and refractive index technology, which is applied in the direction of measuring devices, phase influence characteristic measurement, instruments, etc., can solve the problems of difficult measurement, complex data processing, and large amount of liquid to be measured, so as to achieve convenient operation and measurement process and high measurement accuracy High, simple measuring device effect

Active Publication Date: 2022-05-10
SOUTH CHINA NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In theory, these methods can be used to measure liquid refractive index dispersion or spectrum, but there are still many difficulties in actual experimental measurement, such as the choice of light source, the placement of the liquid to be tested, and the detection method of the signal, etc.
The minimum deflection angle method is to fill different liquids in the hollow prism, and measure the refractive index of the corresponding wavelength through the deflection of light of different wavelengths. This method requires a special hollow prism and a large amount of liquid to be measured; the Abbe refractometer method uses critical To determine the refractive index of different wavelengths of light, this method can only measure the refractive index of liquid with a wavelength of 589nm at present, which is not suitable for measuring the dispersion of refractive index; Based on the principle of reflection, a prism is added to generate dispersion. This method requires three prisms. The experimental system is relatively cumbersome to build, and the liquid film to be tested will produce interference fringes, resulting in large measurement errors. to three decimal places
Ellipsometry is mainly used to measure the refractive index of solids or thin films, and can be used to measure the refractive index spectrum of liquids, but the spectroscopic ellipsometer used is expensive and the data processing is complicated. When directly measuring the liquid dispersion, the liquid surface noise is large , the use of prisms in conjunction with measurement will also bring problems such as cumbersome sample adjustment process and large errors

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  • A method for measuring liquid refractive index dispersion and its application
  • A method for measuring liquid refractive index dispersion and its application
  • A method for measuring liquid refractive index dispersion and its application

Examples

Experimental program
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Embodiment 1

[0085] A device for measuring the dispersion of the refractive index of liquids, such as image 3 As shown, it includes a polychromatic light source 1, a first convex lens 2, a monochromator 3, a second convex lens 4, an aperture diaphragm 5, a prism 6, a liquid sample 7, a U-shaped groove 8, a rotating stage 9, and an outer turntable 10. Telescope11. Wherein, along the direction that the beam advances, the polychromatic light source 1, the first convex lens 2, the monochromator 3, the second convex lens 4, the aperture diaphragm 5 and the rotating stage 9 are arranged in sequence, and the rotating stage 9 is arranged outside In the central area of ​​the turntable 10, the prism 6 is located at the center of the rotating shaft of the rotating stage 9. The bottom surface of the prism 6 is connected with a U-shaped groove 8 for loading liquid; Shadow field observation and measurement. The outer turntable 10 can read the angle value of the position of the telescope 11 . The tel...

Embodiment 2

[0095] A device for measuring the dispersion of the refractive index of liquids, such as Figure 4 As shown, it includes a polychromatic light source 1, a first convex lens 2, a monochromator 3, a second convex lens 4, an aperture stop 5, a prism 6, a liquid sample 7, a rotating stage 9, an outer turntable 10, a telescope 11, Black adhesive tape 12, glass sheet 13.

[0096] The difference between the device provided in this embodiment and that in Embodiment 1 is that the carrier of the liquid sample is different, that is, the glass plate 13 with the black adhesive tape 12 on it replaces the U-shaped groove 8 . A black adhesive tape 12 is pasted on one side of the glass sheet 13 to prevent the reverse, and a small amount of liquid sample 7 is placed on the black adhesive tape and closely attached to the bottom surface of the prism, and placed on the rotating stage 9 together with the prism. In this embodiment, black ground glass or blackened ground glass can also be used as th...

Embodiment 3

[0099] A device for measuring the dispersion of the refractive index of solids, such as Figure 5 As shown, it includes a polychromatic light source 1, a first convex lens 2, a monochromator 3, a second convex lens 4, an aperture stop 5, a prism 6, a rotating stage 9, an outer turntable 10, a telescope 11, a black tape 12, Matching liquid 14, solid sample 15 to be tested.

[0100] The difference between the device provided in this embodiment and that of Embodiment 1 is that the sample to be tested and its carrier are different, that is, the solid sample 15 to be tested replaces the liquid sample 7, the black tape 12 replaces the U-shaped groove 8, and the matching liquid 14 is added at the same time. Stick a black tape 12 on one side of the solid sample 15 to be tested to prevent light reflection from the back, drop a little matching liquid 14 with the same refractive index as the prism on the other side, and stick it to the bottom of the prism to ensure that there are no air ...

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Abstract

The invention discloses a method for measuring liquid refractive index dispersion and its application. In the present invention, a beam of monochromatic light is incident on the frosted side of the prism, enters the prism after being scattered, and hits the interface between the bottom surface of the prism and the sample, and the light reflected by the interface exits through the other side of the prism to detect the outgoing light The exit angle corresponding to the semi-shadow field of view is formed by the total reflection of the interface between the bottom surface of the prism and the sample; the exit angles under the standard sample and the sample to be tested are respectively detected, and the refractive index of the sample to be tested is calculated by substituting into formula A. This method realizes the measurement of liquid refractive index dispersion when the refractive index of the prism is unknown; it can not only measure the refractive index dispersion of transparent liquids, but also measure the refractive index dispersion of weakly absorbing or scattering liquids; it is also suitable for measuring solids and thick films And the refractive index dispersion of gas; the measurement accuracy is high, reaching 0.0001~0.0003.

Description

technical field [0001] The invention belongs to the technical field of photoelectric precision measurement, and in particular relates to a method for measuring liquid refractive index dispersion and its application. Background technique [0002] Refractive index dispersion or spectrum refers to the phenomenon that a medium has different refractive indices for different wavelengths. The refractive index dispersion or spectrum measurement of liquid has important application significance. Through the measurement of liquid refractive index dispersion, the relationship between the liquid’s refractive index and wavelength, concentration and composition can be known. The methods for measuring the liquid’s refractive index mainly include: Reflection method, fiber optic method, minimum deflection angle method, prism method, Abbe refractometer method, diffraction method, ellipsometry, etc. In theory, these methods can be used to measure liquid refractive index dispersion or spectrum,...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N21/41G01N21/01
CPCG01N21/41G01N21/01G01N2021/4126G01N2021/0112G01N2201/061G01N2201/0639G01N2201/0635
Inventor 黄佐华白芸汪娟彭力
Owner SOUTH CHINA NORMAL UNIVERSITY