The most widely used transducers are external clamp type and plug-in type. The mono channel ultrasonic flowmeter has a simple structure and is convenient to use, but it has poor adaptability to changes in flow pattern distribution. The rapid development of microelectronics and computer technology has greatly promoted the upgrading of instruments, and new types of flowmeter have sprung up like mushrooms. So far, it is said that hundreds of flowmeter types have been put on the market, and many thorny problems in on-site use are expected to be solved. The work of developing modern flow measurement technology in China is relatively late, and it is installed at the upstream end of the measurement flow channel 6 and relative to the orifices 11 and 12 to reduce the measured fluid flowing into the orifices 11 and 12; A measurement control component 19 for measuring the propagation time of the ultrasonic wave between the ultrasonic transducers 8 and 9; And a calculation section 20 for calculating a flow rate based on the signal of the measurement control section 19.

Flow measurement is widely used in various fields such as industrial and agricultural production, national defense construction, scientific research, foreign trade, and people's lives. In the production of the petroleum industry, flow measurement runs through the entire process, from oil extraction, transportation, refining and processing to trade sales. Any link cannot be separated from flow measurement, otherwise normal production and trade exchanges in the petroleum industry cannot be guaranteed. In the chemical industry, inaccurate flow measurement can cause imbalance in the distribution ratio of chemical components, unable to ensure product quality, and even serious production safety accidents. In the production of electric power industry, the measurement and regulation of medium flow rates such as liquid, gas, and steam occupy an important position. The accuracy of flow measurement not only has great economic significance for ensuring the operation of power plants under the optimal parameters, but also has become an important link in ensuring the safe operation of power plants with the development of high-temperature, high-pressure, and large-capacity units. If the instantaneous feedwater flow of a large capacity boiler is interrupted or reduced, it may cause serious dry boiler or pipe explosion accidents. This requires that the flow measurement device not only achieve accurate measurement, but also send out alarm signals in a timely manner. In the production of steel industry, the flow measurement of circulating water and oxygen (or air) in the steelmaking process is one of the important parameters to ensure product quality. In light industry, food, textile and other industries, flow measurement is also indispensable.