Vision-based online measurement method for liquid viscosity

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...

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

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