Non-contact measurement method for measuring liquid parameter

A non-contact, measurement method technology, applied in the field of biochemistry and medical detection, can solve the problems of complex image processing principles, large volume, complex structure, etc., and achieve the effect of small sample amount, low cost, and easy measurement

Inactive Publication Date: 2010-06-23
TECHNICAL INST OF PHYSICS & CHEMISTRY - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In order to provide the above functions, PIV technology needs to have corresponding light sources (such as laser transmitters), CCD cameras, PCs with image processing systems, etc. Therefore, PIV measurement systems often have large volumes and complex structures.
In addition, the image processing principle of PIV technology is also very complicated.

Method used

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  • Non-contact measurement method for measuring liquid parameter
  • Non-contact measurement method for measuring liquid parameter
  • Non-contact measurement method for measuring liquid parameter

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] figure 1 It is a schematic diagram of the working process of the method for measuring non-contact liquid flow parameters according to an embodiment of the present invention.

[0043] figure 2 It is a schematic diagram of the system structure of the method for measuring non-contact liquid flow parameters in an embodiment. When the portable household imaging device 3 is an ordinary mobile phone, digital camera or digital video camera, the image processing and parameter analysis software 4 is installed in the computer 5 .

[0044] refer to figure 1 and figure 2 , the liquid parameters are measured as follows:

[0045] Put one end of the transparent capillary 2 horizontally into the measured liquid 1. At this time, the measured liquid undergoes capillary phenomenon in the transparent capillary and starts to flow laminarly. At the same time, the portable household imaging device 3 is turned on to record the whole process of the flow. Then place the transparent capillar...

Embodiment 2

[0053] Figure 4 is another embodiment of the present invention. In order to quickly and efficiently complete the parameter measurement of various liquids, various measured liquids 1 can be caused to undergo capillary phenomena in the array of horizontally placed transparent capillary tubes 2 due to capillary action and start laminar flow, and at the same time use portable household imaging equipment 3 to record the The entire process of the flow and storage of image data. Then the above-mentioned array of transparent capillary tubes 2 is vertically placed, and its inlet end is still immersed in the liquid to be measured. After the height of the liquid column is reached, the portable image device 3 is used to take images of various measured liquids 1 forming a fixed-height liquid column at the bottom of the transparent capillary 2 array. When applying this embodiment, the axis of the lens of the portable home imaging device 3 must be perpendicular to the capillary array plan...

Embodiment 3

[0055] This embodiment is an embodiment that only needs to measure the density of the liquid. As shown in Figure 5, when the present invention is used to realize the measurement of liquid density, the transparent capillary 2 is vertically inserted into the measured liquid 1, and when the liquid interface of the measured liquid 1 stops rising after the transparent capillary 2, the portable household imaging device 3 Carry out image acquisition on the transparent capillary 2, and use the image processing function in the image processing and parameter analysis software 4 to obtain relevant data in the image data, such as: the radius a of the transparent capillary 2, the measured liquid 1 in the transparent capillary 2 The radius of curvature R of the interface, and the height H of the liquid column formed by the measured liquid 1 in the transparent capillary 2; and then using the liquid parameter analysis function in the image processing and parameter analysis software 4, accordin...

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Abstract

The invention provides a non-contact measurement method for measuring a liquid parameter, which comprises the following steps: 1) horizontally putting one end of a transparent capillary into the measured liquid; 2) recording image data of a layered flowing process of the measured liquid in the capillary; 3) vertically placing the capillary; 4) shooting an image of a liquid column with high stability; 5) calibrating a corresponding relationship between the number of pixels in an image device and the length of a shot object, processing the image of the image data to acquire the radius alpha of the capillary, the change process of liquid interface displacement S (t) along with the change of time t, the height H of the liquid column formed in the capillary and the curvature radius R of the liquid interface; and 6) calculating the fluid dynamic parameter of the measured liquid according to the data acquired by processing the image in the step 5). The method does not depend on large equipment, is simple and feasible, has low cost and uses a small amount of samples. The method can easily realize the measurement of a capillary array, and also can measure different liquid parameters.

Description

technical field [0001] The invention belongs to the field of biochemistry and medical detection, in particular, the invention relates to a method for measuring liquid parameters. Background technique [0002] The measurement of flow velocity, flow rate and other parameters and characteristics of the liquid flowing in the pipeline is not only a common problem in industrial production, but also has an increasing application in the fields of biochemistry and medical testing. The size of the liquid to be measured is not limited to the macro scale. With the rapid development of micro / nano technology around the world, the measurement of liquid parameters flowing in micro-pipes is also a hot spot for researchers. [0003] For micro-pipelines, there are many techniques and methods for measuring liquid fluid parameters. According to the measurement state between the measuring instrument and the measured liquid, it can be mainly divided into contact measurement and non-contact measure...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01P5/18G01N9/00G01N11/04G01N13/02
Inventor 刘静杨阳王昊
Owner TECHNICAL INST OF PHYSICS & CHEMISTRY - CHINESE ACAD OF SCI
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