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Micro-fluidic chip

A technology of microfluidic chip and flow channel, which is applied in the direction of instruments, laboratory utensils, analytical materials, etc., can solve the problems of small particle inductance changes, cannot be detected, and the detection ability is not strong, so as to increase the detection ability , good detection ability and detection accuracy, and the effect of accurate detection results

Inactive Publication Date: 2014-10-01
DALIAN MARITIME UNIVERSITY
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AI Technical Summary

Problems solved by technology

The traditional microfluidic single-coil solenoid sensor has a large inductance. When detecting small particles, the inductance change value caused by the particle is too small to be detected compared to its own inductance.
The existing microfluidic inductive oil detection instrument can mainly detect the smallest ferromagnetic particles at about 20 microns, the detection ability is not strong, and the signal-to-noise ratio is not high

Method used

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Embodiment Construction

[0018] The present invention will be further described below in conjunction with the accompanying drawings. like figure 1 As shown, because the equivalent inductance of the two coils after mutual inductance is

[0019] L eq = L 1 L 2 - M 2 L 1 + L 2 - 2 M = L 2 - M 2 2 ( L - M ) = ...

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Abstract

The invention discloses a micro-fluidic chip. The micro-fluidic chip comprises a matrix, a solenoid coil, a solenoid coil lead and a glass slide, wherein an L-shaped flowing pass is arranged inside the matrix; a flowing pass inlet is formed in the left side of the flowing pass; a flowing pass outlet is formed in the right side of the flowing pass; the central section of the flowing pass is a signal detecting area; the solenoid coil is twined at the central part of the signal detecting area, adopts a twin coil structure and adopts a double strand enameled wire for twining; the two coils are the same in the twining direction and in the current direction and twined in a parallel manner; one end of the solenoid coil lead is connected with the solenoid coil and the other end of the solenoid coil lead is led out of the matrix. According to the invention, a twin coil solenoid sensor solves the problem that the conventional unicoil sensors are unstable in electrical property and is easily disturbed by environment; when the self-inductance of the two coils can be greatly reduced through mutual inductance; the micro-fluidic chip is very good in detectability and detecting accuracy for smaller particles and ferromagnetic particles smaller than 10 micrometers can be detected; in addition, the length of a detecting coil doesn't need to be increased, and the possibility that particles to be detected enter the detecting area can be greatly lowered.

Description

technical field [0001] The invention relates to the oil liquid monitoring technology of machine equipment, in particular to a microfluidic control chip. Background technique [0002] Particle pollutants in oil are the most important cause of hydraulic system failures. Being able to detect information about particle pollutants in oil is a reliable method for fault diagnosis of equipment systems. The traditional microfluidic single-coil solenoid sensor has a large self-inductance. When detecting small particles, the inductance change value caused by the particle is too small to be detected compared to its own inductance. The existing microfluidic inductive oil detection instrument can mainly detect the smallest ferromagnetic particles at about 20 microns, the detection ability is not strong, and the signal-to-noise ratio is not high. Contents of the invention [0003] In order to solve the above-mentioned problems in the prior art, the present invention designs a microfluid...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01L3/00G01N15/00
Inventor 张洪朋张堂伟张兴明刘后祥
Owner DALIAN MARITIME UNIVERSITY
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