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Method for rapidly measuring liquid phase diffusion coefficient based on liquid core column lens equal observation height

A technology of liquid phase diffusion coefficient and observation height, applied in the field of optical measurement of liquid phase diffusion coefficient, can solve the problem that it is difficult to judge which measurement result is accurate.

Active Publication Date: 2017-10-13
YUNNAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

For some diffusion systems with unknown diffusion coefficients, when the liquid phase diffusion coefficient is measured by the liquid cylindrical lens system, once the measurement results of the equal refractive index thin layer method and the transient refractive index spatial distribution method are different, it is difficult to judge whether the two methods are measured. which result is accurate

Method used

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  • Method for rapidly measuring liquid phase diffusion coefficient based on liquid core column lens equal observation height
  • Method for rapidly measuring liquid phase diffusion coefficient based on liquid core column lens equal observation height
  • Method for rapidly measuring liquid phase diffusion coefficient based on liquid core column lens equal observation height

Examples

Experimental program
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Effect test

Embodiment 1

[0071] Measure the relationship between KCl solution concentration (refractive index) and image width

[0072] 1.1 Fitting the linear relationship between the concentration of KCL aqueous solution and the refractive index

[0073] In order to determine the concentration of KCL aqueous solution in the formula (1) C and refractive index n The relationship between, that is to find out (1) in the m and C 0 . Prepare different concentrations of KCL aqueous solutions at room temperature (25°C), and use an Abbe refractometer to measure the corresponding refractive indices of different concentrations of KCL aqueous solutions (as shown in Table 1), and fit the relationship between the concentration of KCL aqueous solution and the refractive index to satisfy Linear relationship:

[0074] , (correlation coefficient R 2 = 0.999). (6)

[0075] Table 1 Refractive index of different concentrations of KCL

[0076]

[0077] 1.2 Refractive index obtained by experimental method ...

Embodiment 2

[0096] Measurement of Diffusion Coefficient of 0.33mol / L KCL Solution by Equal Observation Height Method

[0097] use figure 1 When the shown device measures the diffusion coefficient of 0.33mol / L KCL solution at 25°C, the refractive index of the liquid core injected behind the double liquid stem lens The aplanatic solution makes it the best aplanatic effect in the KCL diffusion system. Inject 3 mol / L KCL solution into the lower end of the front liquid core of the double liquid stem lens, and inject 0.33 mol / L KCL solution into the upper end. Select the refractive index of the solution close to the top as the accurate imaging focus to observe the thin layer ( ).

[0098] 1.1 Diffusion image width measurement at different times

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Abstract

The present invention discloses a method for rapidly measuring the liquid phase diffusion coefficient based on liquid core column lens equal observation height. According to the present invention, the used liquid core column lens is used as the liquid phase diffusion cell and the imaging element; one height on a CMOS image acquisition system is used as the observation height, the relationship among the image width, the refractive index and the concentration is measured with two methods, the liquid phase diffusion coefficient is obtained through least square method fitting according to the concentration information reflected by the image, and the equal observation height method is verified by using the mutual diffusion system between 0.33 mol / L KCL solution and 3 mol / L KCL solution as the example; and the method has characteristics of rapid measurement (about 70min) and accurate measurement value (relative error is less than 2%), further improve the method for measuring the liquid phase diffusion coefficient by using the liquid core column lens, and proves that the system for measuring the liquid phase diffusion coefficient by using the liquid core column lens is stable, the calculation method is diverse, and the accuracy of measurement result is high.

Description

technical field [0001] The invention belongs to the technical field of optical measurement of liquid-phase diffusion coefficient, and in particular relates to a method for rapidly and accurately measuring liquid-phase diffusion coefficient based on a liquid-cylindrical lens system—the equal observation height method. Especially in combination with the advantages of high refractive index sensitivity of the double-liquid stem lens, good aplanatic effect in a wide range of refractive index, and adjustable aplanatic position (refractive index), according to the CMOS image acquisition system The spatial distribution information of the refractive index reflected by the diffusion image can quickly and accurately measure the liquid phase diffusion coefficient. Background technique [0002] Diffusion coefficient is an important basic data for studying mass transfer process, calculating mass transfer rate and chemical design and development, and has been widely used in emerging indust...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/41G01N13/00
CPCG01N13/00G01N21/41G01N2013/003G01N2021/416
Inventor 孟伟东普小云夏燕陈艳
Owner YUNNAN UNIV
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