Fluid viscosity coefficient measuring instrument based on image recognition

Abstract

A fluid viscosity coefficient measuring instrument based on image recognition comprises a heat insulation base, a heating wire, a semiconductor chilling plate module, a base cover, a support, a photoelectric door, a weight clamp, a Y-shaped supporting frame, a fixed pulley, a gradienter, a display screen, an operation panel, a photoelectric timer, a gas measuring cylinder, a liquid measuring cylinder, a gas storage cylinder, an electronic scale, a long graduated scale, a camera and a tripod. According to the invention, the viscosity coefficients of liquid and gas can be measured by adopting aball lifting method; the adopted device can achieve rapid temperature changing and accurate temperature control. During an experiment, a program developed on the basis of Visual Studio2017 + opencv4.0+ cpp is adopted, so that an experiment result is obtained; a camera is used for tracking falling of weights, the long graduated scale is arranged beside the camera, the real-time falling speed of the weights is obtained by comparing the number of scales that an inter-frame tracking frame falls thruogh, fitting is conducted on collected data through a derived formula, and the viscosity coefficient of fluid is obtained. The instrument is high in operation precision, strong in practicability and applicability, high in performance of deep expansion research, visual in demonstration and simple and convenient to operate.

Description

technical field [0001] The invention relates to the field of physical experiment instruments, in particular to a fluid viscosity coefficient measuring instrument based on image recognition. Background technique [0002] The viscosity coefficient of fluid is an important physical quantity to describe the internal friction property of fluid. The viscosity coefficient is sensitive to temperature in addition to being different from material to material. The viscosity coefficient of liquid decreases with the increase of temperature, and the opposite is true for gas, which generally increases in proportion to . Studying the viscosity coefficient of fluid liquid plays an important role not only in material science research, but also in engineering technology and other fields. [0003] The traditional methods for determining the viscosity coefficient of liquids include capillary method, rotation method, falling needle method and falling ball method, etc. Compared with the first th...

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Problems solved by technology

However, in the various improvement schemes, there are still many objective factors that lead to errors in the experimental data: (1) Two photogates are used to monitor the falling balls in the liquid, but the propagation of light will be affected in the liquid, There will be large errors in data reading; (2) Use the rising ball method and use two sets of photogates distributed up and down to measure the speed of the falling weight, but it is still released by hand, the weight is easy to shake, and the weight is not solved The problem of swinging when falling; (3) The linear array CCD is used for speed measurement, but the temperature of the experimental environment is not controlled, so the viscosity coefficient of the liquid measured during the experiment is always affected by the temperature change; (4) The instrument Heating in a water bath, but due to the strong thermal inertia of water, it is difficult to achieve accurate and rapid temperature control and temperature change; (5) The rising ball method is used to measure the viscosity coefficient of water-vapour mixture, but because only a fixed pulley is used, Final weights are prone to fall into the water vapor mixture

In addition, there is currently no experimental improvement on the market that can simultaneously measure fluids with a high viscosity coefficient and a fluid with a low viscosity coefficient; moreover, at present, most of the experimental velocity collection is idealized and the ball is considered to be at a uniform velocity. Movement, which is quite different from the actual situation

Most of the viscosity coefficient measuring devices have the problems of low precision, too idealization, and low applicability

In addition, many improved devices have more peripheral wiring, and the experiment is cumbersome

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