Ultrasonic waves carry information on the flow rate of the fluid when it travels in a flowing fluid. Therefore, the flow velocity of the fluid can be detected by the received ultrasonic wave and converted to flow. According to the detection method, it can be divided into different types of ultrasonic flowmeters such as the differential propagation velocity method, Doppler method, beam offset method, noise method, and correlation method. Ultrasonic flowmeter is a kind of application that began to be applied in the last decade with the rapid development of integrated circuit technology.
Non-contact meter for measuring fluids that are not easily accessible and observable, as well as large pipe flow. It works in conjunction with a water gauge to measure open flow. The use of ultrasonic flow ratio does not change the flow state of the fluid without installing a measuring element in the fluid, and no additional resistance is generated. The installation and overhauling of the instrument does not affect the operation of the production line and is thus an ideal energy-efficient flow meter.
As we all know, industrial flow measurement generally has the problem of difficult measurement of large diameter and large flow. This is because the flowmeter generally has difficulties in manufacturing and transportation as the diameter of the measurement increases, and the cost is increased and the energy loss is increased. Installation not only has these drawbacks, but ultrasonic flowmeters can be avoided. Because all kinds of ultrasonic flowmeters can be installed outside the pipe, non-contact flow measurement, the instrument cost is basically irrelevant to the size of the measured pipe diameter, while other types of flowmeters increase with the diameter, the cost increases significantly, so the larger the caliber ultrasonic The flowmeter has a superior function to price ratio over other types of flowmeters with the same function. Considered to be a good large-diameter flow measuring instrument, the Doppler ultrasonic flowmeter can measure the flow of the two-phase medium, so it can be used for the measurement of dirty streams such as sewers and sewage. In power plants, the use of a portable ultrasonic flow meter to measure the flow rate of large turbines, such as turbine inlet and turbine circulating water, is much more convenient than the past. Ultrasonic flow juice can also be used for gas measurements. The applicable range of the pipe diameter is from 2cm to 5m, and it can be applied from several meters wide open channel, underdrain to 500m wide river.
In addition, the flow measurement accuracy of the ultrasonic measuring instrument is almost unaffected by the parameters such as temperature, pressure, viscosity, and density of the measured fluid, and it can be made into a non-contact and portable measuring instrument, so it can solve the problem that other types of instruments are difficult to measure. Corrosive, non-conductive, radioactive and flammable, explosive media flow measurement problems. In addition, given the non-contact measurement characteristics, coupled with a reasonable electronic circuit, a single meter can adapt to a variety of pipe diameter measurements and multiple flow range measurements. Ultrasonic flow meter adaptability is also unmatched by other instruments. Ultrasonic flowmeter has some advantages mentioned above. Therefore, it has been paid more and more attention and developed into a series of products and generalized. Now, standard, high-temperature, explosion-proof, and wet type instruments of different channels have been made to adapt to different media. Flow measurement of occasions and different pipeline conditions.
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