Method for measuring liquid phase diffusion coefficient by utilizing instant refractive index spatial distribution of liquid core cylindrical lens

A technology of liquid phase diffusion coefficient and spatial distribution, applied in the field of optical measurement of liquid phase diffusion coefficient, can solve the problem of equal refractive index thin layer method

Active Publication Date: 2014-11-26
YUNNAN UNIV
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Problems solved by technology

However, the equal-refractive-index thin-layer measurement method needs to collect multiple diffusion images at different diffusion times, and the acquisition o

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  • Method for measuring liquid phase diffusion coefficient by utilizing instant refractive index spatial distribution of liquid core cylindrical lens
  • Method for measuring liquid phase diffusion coefficient by utilizing instant refractive index spatial distribution of liquid core cylindrical lens
  • Method for measuring liquid phase diffusion coefficient by utilizing instant refractive index spatial distribution of liquid core cylindrical lens

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Embodiment Construction

[0065] §1 The device of the present invention

[0066] The inventive device such as figure 1 , the radii of curvature of the four surfaces of the designed asymmetric cylindrical lens 6 are R 1 =37.6mm, R 2 = R 3 =17mm, R 4 =20mm, thickness d 1 =3mm, d 2 =4.5mm, height h =50mm, material is K9 glass refractive index n 0 =1.5168, the cylindrical lens 6 is not only used as a liquid phase diffusion cell, but also as an imaging element. A yellow LED is used as the light source 1, which becomes parallel light after being collimated by a microscope objective lens 2 of ×20, a 20-micron aperture stop 3 and a telephoto collimator lens 4. onto the cylindrical lens 6.

[0067] During the experiment, the diffusion solution A and the diffusion solution B were slowly injected into the cylindrical lens 6 . Images are acquired with a CMOS image sensor 7 . The imaging system is fixed on an electronic stage 11 with a minimum graduation value of 1 μm. When the single refractive ...

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Abstract

The invention discloses a method for measuring the liquid phase diffusion coefficient by utilizing instant refractive index spatial distribution of a liquid core cylindrical lens, and belongs to a method for optical measurement of the liquid phase diffusion coefficient. The method comprises the following steps: selecting a plurality of sampling points in the medium diffusion time by taking the liquid core cylindrical lens as a liquid phase diffusion tank and an imaging element, controlling a CMOS chip to collect an instant diffusion image by utilizing a Microsoft Visual Basic program, acquiring a set of ordered pairs of the refractive index n and the position Z according to the corresponding relationship between the image width of the image and the refractive index, and then directly calculating the liquid phase diffusion coefficient by the Fick second law. A diffusion experiment of pure water with ethylene glycol and saccharose solutions with different concentrations respectively shows that the method is extremely rapid in measurement speed (less than one second), and is accurate in measurement value (the relative error is less than 3%).

Description

[0001] technical field [0002] The invention belongs to a method for optically measuring the liquid phase diffusion coefficient, in particular, the spatial distribution of the refractive index and the diffusion coefficient can be automatically and quickly obtained by obtaining an instantaneous image through CMOS acquisition. Background technique [0003] Liquid phase 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 industries such as biology, chemical industry, medicine and environmental protection. However, the liquid-phase diffusion coefficient is mainly obtained by experimental methods, that is, indirectly measuring the concentration formed by the diffusion distribution of the solution with space and time, and calculating the liquid-phase diffusion coefficient according to the Fick law of the diffusion process. These measurement met...

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Application Information

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IPC IPC(8): G01N21/41
Inventor 孟伟东普小云孙丽存杨瑞芬瞿影
Owner YUNNAN UNIV
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