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Vision-based online measurement method for liquid viscosity

A measurement method and viscosity technology, applied in the field of image processing, can solve problems such as inaccurate measurement results, cumbersome operations, and affecting product quality, and achieve the effects of improving sensitivity and saving labor costs

Active Publication Date: 2019-06-25
SHENYANG INST OF AUTOMATION - CHINESE ACAD OF SCI
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  • Application Information

AI Technical Summary

Problems solved by technology

The rotary viscometer commonly used to measure fluid viscosity in the laboratory is not suitable for viscosity detection in the production site, and the portable funnel viscometer and other devices used in the production site also have problems such as inaccurate measurement results and cumbersome operation.
And the above methods are all off-line measurement, additional production process is added, and when the difference between production and measurement environment is large, such as high temperature production environment, the measurement result will have a large error
In addition, due to the inability to monitor the viscosity of the fluid in the production process in real time, it is difficult to detect the viscosity changes caused by ingredients and environmental changes in the production process in time, thus affecting the quality of the product

Method used

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  • Vision-based online measurement method for liquid viscosity
  • Vision-based online measurement method for liquid viscosity
  • Vision-based online measurement method for liquid viscosity

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Experimental program
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Embodiment Construction

[0053] The present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments.

[0054] A velocity field and viscosity online measurement system, comprising the following steps:

[0055] Image acquisition: collect the flow image of the liquid;

[0056] Calculate the optical flow field: calculate the optical flow field by the optical flow method;

[0057] Calculate the velocity field: Calculate the velocity field according to the camera parameters and the optical flow field;

[0058] Estimated Viscosity: Estimates liquid viscosity from the velocity field.

[0059] The camera collects images at fixed time intervals of the flowing liquid, that is, a sequence of pictures or a video.

[0060] Calculate the optical flow field of adjacent pictures in a picture sequence or video by sparse or dense optical flow method. The sparse optical flow method first selects the pixel points with obvious brightness changes in the picture a...

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Abstract

The invention relates to a vision-based online measurement method for liquid viscosity. The method mainly comprises the steps that an optical flow method is used to calculate a velocity field and liquid viscosity is calculated according to the velocity field. Firstly, a camera is used to collect a fluid image sequence or video at a fixed time interval, and then an optical flow field is calculatedthrough an optical flow technique. A liquid velocity field is calculated according to an object and image proportional relationship. Finally, liquid viscosity is calculated according to the Newtonianfluid formula or a look-up table method. The method provided by the invention can measure liquid viscosity in real time in a non-contact online manner, and monitors the liquid viscosity information ina device without affecting the normal operation of the device in real time.

Description

technical field [0001] The invention belongs to the field of image processing, in particular to a method for measuring liquid viscosity. Background technique [0002] Fluid viscosity measurement is very important in the fields of industrial production and scientific research, especially in the production processes of medicine, food, chemical industry, etc., it is necessary to measure viscosity accurately to ensure product quality. There are also a wide variety of measuring devices and methods used, the common ones are the pipe flow method, the falling ball method, the rotation method and the discharge method. The rotary viscometer commonly used to measure fluid viscosity in the laboratory is not suitable for viscosity detection in the production site, and the portable funnel viscometer and other devices used in the production site also have problems such as inaccurate measurement results and cumbersome operation. Moreover, the above-mentioned methods are all off-line measur...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N11/00
Inventor 冯云丛杨田冬英
Owner SHENYANG INST OF AUTOMATION - CHINESE ACAD OF SCI
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