When ultrasonic waves propagate in a flowing fluid, they carry information about the flow rate of the fluid. Therefore, the flow velocity of the fluid can be detected by the received ultrasonic wave and converted into the flow rate. According to the detection method, it can be divided into different types of ultrasonic flowmeters such as propagation velocity difference method, Doppler method, beam shift method, noise method and related method. Ultrasonic flowmeter is a kind of application that has only begun to be applied with the rapid development of integrated circuit technology in the past ten years.
Non-contact instrument, suitable for measuring the flow of fluids that are not easy to contact and observe and large pipe diameters. It can be linked with the water level gauge to measure the flow of open water flow. The use of ultrasonic flow rate ratio does not need to install the measuring element in the fluid, so it will not change the flow state of the fluid, and does not produce additional resistance. The installation and maintenance of the instrument will not affect the operation of the production pipeline, so it is an ideal energy-saving flowmeter.
As we all know, industrial flow measurement generally has the problems of large pipe diameter and large flow measurement difficulty. This is because the increase in measuring pipe diameter will bring about difficulties in manufacturing and transportation, increasing cost, increasing energy loss, Not only this disadvantage of installation, but also the ultrasonic flowmeter can be avoided. Because all kinds of ultrasonic flowmeters can be installed outside the tube and non-contact flow measurement, the cost of the meter is basically independent of the diameter of the pipe to be measured, while the cost of other types of flowmeters increases greatly as the diameter increases, so the larger the diameter of the ultrasonic The function and price ratio of flow meters is superior to other types of flow meters with the same function. Considered to be a better large pipe diameter flow measuring instrument, the Doppler ultrasonic flowmeter can measure the flow of two-phase media, so it can be used for the measurement of sewage and sewage and other dirty flows. In power plants, it is much more convenient to use portable ultrasonic flowmeters to measure the flow rate of large pipe diameters such as the water inflow of the water turbine and the circulating water of the steam turbine. Ultrasonic wasted juice can also be used for gas measurement. The applicable range of pipe diameter is from 2cm to 5m, from open channels and culverts with a width of several meters to rivers with a width of 500m.