Microfluidic flow velocity detection device based on light propagation characteristic change

A detection device and microfluidic technology, which is applied in the direction of measuring device, fluid velocity measurement, velocity/acceleration/impact measurement, etc., can solve the problem of low precision and achieve the effect of high accuracy of flow velocity detection

Inactive Publication Date: 2021-02-09
西安柯莱特信息科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Traditional flow rate detection technology based on heat transfer and cantilever beam deformation has low accuracy

Method used

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  • Microfluidic flow velocity detection device based on light propagation characteristic change
  • Microfluidic flow velocity detection device based on light propagation characteristic change
  • Microfluidic flow velocity detection device based on light propagation characteristic change

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] The invention provides a microfluidic flow velocity detection device based on the change of light propagation characteristics. Such as figure 1 As shown, the microfluidic flow velocity detection device based on the change of light propagation characteristics includes a microfluidic chip 1 , a fiber core 3 , and a flexible layer 4 . A fluid channel 2 is provided on the surface of the microfluidic chip 1, and the cross section of the fluid channel 2 is rectangular. The fiber core 3 is placed on the microfluidic chip 1 , and the fiber core 3 straddles the fluid channel 2 . The fiber core 3 is a micro-nano fiber core, that is to say, the fiber core 3 has a micro-nano size, so as to improve the coupling performance of light in the fiber core 3 and the outside world. The flexible layer 4 covers the fluid channel 2 and the fiber core 3 , and the flexible layer 4 is respectively provided with openings at the inlet and outlet of the fluid channel 2 . On top of the fluid chann...

Embodiment 2

[0026] On the basis of Embodiment 1, the fiber core 3 is in contact with the flexible layer 4 at the top of the fluid channel 2 . That is to say, within the fluid channel 2, the fiber core 3 is only in contact with the flexible layer 4, rather than being connected together. In this way, when the flexible layer 4 bends outward, the flexible layer 4 is separated from the core 3, thereby changing the environment around the core 3, changing the effective refractive index of the environment around the core 3, and changing the core 3 light propagation characteristics. Because the light propagation characteristics of the fiber core 3 , especially the micro-nano fiber core, are very sensitive to its surrounding environment, this embodiment has the advantage of high flow velocity detection accuracy.

Embodiment 3

[0028] On the basis of Example 2, such as figure 2 As shown, a noble metal part 5 is also included, and the noble metal part 5 is fixed on the flexible layer 4 in the fluid channel 2 . The noble metal part 5 is strip-shaped, and the strip shape is along the direction of the fiber core 3 , and the noble metal part 5 is in contact with the fiber core 3 . The material of the noble metal portion 5 is gold or silver. When the flexible layer 4 bends outward, the fiber core 3 is separated from the noble metal part 5, thereby changing the coupling between the fiber core 3 and the noble metal part 5, because the coupling performance between the fiber core 3 and the noble metal part 5 is strong, and the fiber core 3 and the noble metal part 5 The change of the spacing between them can more seriously affect the light propagation characteristics of the fiber core 3 , so as to achieve higher-precision flow velocity detection. In addition, the noble metal part 5 is in the shape of a bar....

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Abstract

The invention provides an optical propagation characteristic change-based microfluidic flow velocity detection device. The device comprises a microfluidic chip, a fiber core and a flexible layer, wherein the surface of the microfluidic chip is provided with a fluid channel, the fiber core is arranged on the microfluidic chip, the fiber core stretches across the fluid channel, and the flexible layer coats the fluid channel and the fiber core; and the flexible layer is provided with openings at the inlet and the outlet of the fluid channel respectively. The device has the advantage of high flowvelocity detection precision.

Description

technical field [0001] The invention relates to the field of microfluidic flow velocity detection, in particular to a microfluidic flow velocity detection device based on changes in light propagation characteristics. Background technique [0002] Microfluidic technology is an important platform for scientific research in the fields of fluid physics, biolaser technology, and microreactors. Microfluidic velocity detection is an important part of microfluidic technology. Traditional flow velocity detection techniques based on heat transfer and cantilever beam deformation have low accuracy. Contents of the invention [0003] In order to solve the above problems, the present invention provides a microfluidic flow rate detection device based on changes in light propagation characteristics, including: a microfluidic chip, a fiber core, and a flexible layer. The surface of the microfluidic chip is provided with a fluid channel, and the fiber core Placed on the microfluidic chip,...

Claims

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Application Information

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IPC IPC(8): G01P5/26B01L3/00
CPCB01L3/502746G01P5/26
Inventor 不公告发明人
Owner 西安柯莱特信息科技有限公司
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