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Microfluidic flow velocity detection device based on electrical principle

A detection device and microfluidic technology, 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 low detection cost and high sensitivity

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 electrical principle
  • Microfluidic flow velocity detection device based on electrical principle
  • Microfluidic flow velocity detection device based on electrical principle

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] The invention provides a microfluidic flow velocity detection device based on the electrical principle. Such as figure 1 As shown, the microfluidic flow rate detection device based on electrical principles includes a microfluidic chip 1 , a first plate 3 , a second plate 4 , a flexible layer 5 , and a dielectric part 6 . The surface of the microfluidic chip 1 is provided with a fluid channel 2 , that is to say, the surface of the microfluidic chip 1 is provided with a groove, and the groove is the fluid channel 2 . The first pole plate 3 and the second pole plate 4 are placed on both sides of the fluid channel 2 . The shapes of the first pole plate 3 and the second pole plate 4 can be rectangular or square, which is not limited here. The flexible layer 5 is placed between the first pole plate 3 and the second pole plate 4 , the flexible layer 5 covers the fluid channel 2 , and the flexible layer 5 is respectively provided with openings at the inlet and outlet of the f...

Embodiment 2

[0024] On the basis of Example 1, such as figure 2 As shown, there are two dielectric parts 6 . The dielectric portion 6 is strip-shaped. The dielectric part 6 is fixed vertically on the flexible layer 5 . In this way, the force of the fluid not only changes the height of the dielectric part 6, but also changes the relative positional relationship between the two dielectric parts 6, that is to say, under the action of the fluid, the two dielectric parts 6 Gradually change from parallel to have a certain angle. Therefore, the active force of the fluid can change the dielectric environment between the first pole plate 3 and the second pole plate 4 more, thereby changing the capacitance between the first pole plate 3 and the second pole plate 4 more, thereby Realize higher precision flow velocity detection.

Embodiment 3

[0026] On the basis of Example 2, such as image 3 As shown, the dielectric part 6 is horizontally fixed on the flexible layer 5 . When there is no fluid in the fluid channel 2, the two dielectric parts 6 are arranged horizontally, that is, arranged head-to-head. When the fluid channel 2 contains fluid, under the action of the fluid, the opposite ends of the two dielectric parts 6 are lifted, thereby seriously changing the distribution of electric field lines between the first pole plate 3 and the second pole plate 4, Thereby changing the dielectric environment between the first pole plate 3 and the second pole plate 4 more, thereby changing the capacitance between the first pole plate 3 and the second pole plate 4 more, thereby achieving higher precision velocity detection.

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Abstract

The invention provides a microfluidic flow velocity detection device based on an electrical principle. The microfluidic flow velocity detection device comprises a microfluidic chip, a first polar plate, a second polar plate, a flexible layer and a dielectric part, wherein the surface of the microfluidic chip is provided with a fluid channel, the first polar plate and the second polar plate are arranged at two sides of the fluid channel, and the flexible layer is arranged between the first polar plate and the second polar plate; the flexible layer wraps the fluid channel, the flexible layer isprovided with openings at an inlet and an outlet of the fluid channel respectively, and the dielectric part is arranged at the top of the fluid channel on the flexible layer. During application, the first polar plate and the second polar plate are connected with the electrode, and flow velocity detection is realized by detecting capacitance change between the first polar plate and the second polarplate. The device has the advantage of high flow velocity detection sensitivity. In addition, the method is based on traditional electrical physical quantity measurement, and detection cost is low.

Description

technical field [0001] The invention relates to the field of microfluidic flow rate detection, in particular to a microcapacitor-based microfluidic flow rate detection device. 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 electrical principles, including: a microfluidic chip, a first plate, a second plate, a flexible layer, a dielectric part, a microfluidic chip The surface of the surface is provided with a fluid channel, the first pole plate and the second pole plate are placed on both sides o...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01P5/08B01L3/00
CPCB01L3/502746G01P5/08
Inventor 不公告发明人
Owner 西安柯莱特信息科技有限公司