Electrochemical micro flow measurement method and electrochemical micro flow sensor
A measurement method, electrochemical technology, applied in the direction of measuring flow/mass flow, liquid/fluid solid measurement, measuring devices, etc., can solve problems that are difficult to realize, and achieve the effects of easy integration, great application value, and simple manufacturing process
Inactive Publication Date: 2005-11-23
ZHEJIANG UNIV
View PDF0 Cites 9 Cited by
- Summary
- Abstract
- Description
- Claims
- Application Information
AI Technical Summary
Problems solved by technology
When the concentration of active components in the fluid is known, electrochemical sensors can be used to measure the flow rate of the fluid in the microchannel, but the disadvantage of this method is that the concentration of electrochemically active components in the fluid must be known in advance
This requirement is often difficult to achieve in many applications
This is also the reason why electrochemical flow measurement is easy to implement in micro-pipes, but the current mainstream method of flow measurement in micro-pipes is still based on heat conduction technology and pressure measurement.
Method used
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View moreImage
Smart Image Click on the blue labels to locate them in the text.
Smart ImageViewing Examples
Examples
Experimental program
Comparison scheme
Effect test
Embodiment Construction
[0025] Such as figure 1 , two electrochemical sensors are arranged upstream and downstream along the fluid direction indicated by the arrow in the micropipe, and the concentration distribution of the active ingredient near the working electrodes 1 and 2 is obtained by computer simulation according to the Laplace equation. Here, the distance between the working electrodes 1 and 2 is 10 microns, the width of each working electrode is also 10 microns, and the height of the micropipe is 50 microns. The simulation results show that in the fluid at the same distance from the working electrode, the concentration of the active ingredient corresponding to the working electrode 1 is greater than that corresponding to the working electrode 2. This also proves that after the working electrode 1 consumes the active ingredient in part of the fluid, due to the convective movement of the fluid, the concentration of the active ingredient in this part of the fluid has not yet passed the concent...
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More PUM
Login to View More Abstract
The invention discloses a measuring method for electrochemical micro discharging, which includes: placing two identical electrochemical inverter on vertical stream of micro pipe separately with the pitch between several hundred micrometers to several nanometers, using electrochemical measuring apparatus to quote corresponding response of the two electrochemical inverter separately, acquiring fluidic flow ratio by computing differential value or relative value. The invention also discloses two electrochemical micro inverters which comprises micro channel, two working electrodes common with one common polar electric pole, and reference electric pole, or comprises micro channel, two covering electric poles with the pitch between several hundred micrometers to several nanometers, polar electric pole, and reference electric pole.
Description
technical field [0001] The invention relates to a method for measuring the flow rate of a liquid in a micropipe by using an electrochemical principle and an electrochemical microflow sensor designed according to the method, which has wide application value in fields such as biochips and microfluidic control systems. Background technique [0002] Microfluidics is a new technology developed in the 1990s. How to effectively control fluid flow in microfluidic systems is a very critical technology. At present, the commonly used flow sensors can be basically divided into two categories: one is based on heat conduction technology, which requires a heat source and a temperature sensor, and the flow is measured by measuring the convection and conduction of heat in the fluid; the other is based on pressure Measured, which determines flow by measuring the pressure difference between two specific points in a pipe. To implement these two types of flow testing techniques in a microfluid...
Claims
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More Application Information
Patent Timeline
Login to View More Patent Type & Authority Applications(China)
IPC IPC(8): G01F1/64
Inventor 吴坚楼正国杨群清
Owner ZHEJIANG UNIV