The "dual carbon action" is to achieve the goal of carbon neutrality by adjusting the energy structure, optimizing energy consumption methods and implementing artificial carbon sequestration measures.

Flow metering involves liquid and gas flow measurement, which is the basis of energy metering and energy consumption measurement, and is an important part of national energy security, providing data support for the promotion of energy conservation and consumption reduction, and how to further improve the accuracy of flowmeter has become the focus of research.
 

An ultrasonic flowmeter is a device used to measure the flow of fluids, including but not limited to sewage, factory effluents, dirty process fluids, agricultural water, slurries, slurries, non-net fuel oil, crude oil, etc.

It uses the properties of ultrasonic stable transmission, based on the time difference method, frequency method, cross-correlation method and Doppler method to calculate the fluid flow velocity, the time difference method calculation principle is simple, the Doppler method calculation accuracy is high, and it is the two most widely used methods. The ultrasonic flowmeter has the characteristics of non-contact and high precision, has little impact on the turbulent environment, and shows higher measurement accuracy than the mechanical flowmeter due to the stable sound wave transmission under the premise of not polluting the turbulent material, which is a high-precision instrument with great potential, and is expected to replace the existing mechanical flowmeter and promote the continuous development of measurement technology in the direction of high precision.
 

Ultrasonic flowmeter has been widely used in large-diameter pipeline measurement due to the characteristics of non-contact and instantaneous measurement, such as foreign research on ultrasonic flow measurement technology started earlier, and is currently combined with complex neural network algorithms such as CNN, R-U-Net and LSTM to correct errors and achieve high measurement accuracy.

However, in the small aperture and high temperature environment, the measurement accuracy is still not high, and the error at high temperature reaches 6%, so how to expand the application environment of ultrasonic flowmeter and occupy a larger market has become the focus of research.

The domestic ultrasonic measurement technology is developing to improve the measurement accuracy, and the influence of vortex, secondary flow and vortex on the flow velocity field is reduced from three aspects: improving the measurement environment, increasing the sampling points and optimizing the calculation scheme, and improving the measurement accuracy. In terms of application, ultrasonic flowmeters are commonly used in gas monitoring, and they need to be used with caution in small diameters and high temperature and high pressure, so it is important to further improve the accuracy of ultrasonic measurement.