logo
logo
Sign in

Ultrasonic flow meter work principle

avatar
Kevin Tu
Ultrasonic flow meter work principle

According to the principle of signal detection, ultrasonic flowmeter can be divided into propagation speed difference method (direct time difference method, time difference method, phase difference method and frequency difference method), beam migration method, Doppler method, cross-correlation method, spatial filter method and noise method. Ultrasonic flowmeter and ultrasonic flowmeter, because the flow path of the instrument does not set any obstacles, belongs to the flow meter, suitable for solving a class of flowmeter flow measurement problems, especially in the large flow measurement has a more prominent advantage, it is a rapid development of flowmeter category. Ultrasonic flowmeter adopts the principle of time difference measurement: Through the pipe wall, medium, the other side of the wall to launch a probe signal, received by another probe, at the same time, the launch of the second probe signal and the first probe because of the influence of the medium speed, receives the Δ t lag, according to the calculation can be concluded that the velocity V and lag Δ tV = (C2) / 2 lx Δ transformation relationship between t, Then the flow value Q can be obtained.


As ultrasonic waves travel through a moving fluid, they carry information about the velocity of the fluid. Therefore, the received ultrasound can detect the flow rate of the fluid, which is converted to the flow rate. According to the detection method, it can be divided into different types of ultrasonic flowmeter, such as propagation velocity difference method, Doppler method, electron beam migration method, noise method, correlation method and so on. Ultrasonic flowmeter is a non - contact instrument which has been applied with the rapid development of IC technology in recent ten years. It is suitable for measuring the flow of fluids and large tubes which are not easily accessible and observed. It can be used in conjunction with a gauge to measure the flow of open water. The use of ultrasonic flow ratio does not require the installation of measuring elements in the fluid, thus does not change the flow state of the fluid, does not create additional resistance, the installation and maintenance of the meter does not affect the production of the running line, so it is the ideal energy saving flowmeter.


Industrial flow measurement generally exists in large diameter pipelines, large flow measurement is difficult, this is because ordinary flowmeter with the measurement of pipeline diameter will bring difficulties to manufacturing and transportation, cost increases, energy consumption increases, installation not only these shortcomings, can avoid the use of ultrasonic flowmeter. Because a variety of ultrasonic flowmeters can be installed outside the tube for non-contact flow measurement, the cost of the instrument is essentially independent of the diameter of the pipe being tested, while the cost of other types of flowmeters increases significantly as the cost increases. The diameter of the. Therefore, compared with other flowmeters with the same function, the larger the diameter of the ultrasonic flowmeter, the better the price of the ultrasonic flowmeter function. Doppler ultrasonic flowmeter is considered to be a good large-scale pipeline runoff measurement instrument, which can measure the flow rate of two-phase media, so it can be used for sewage and other dirty flow measurement. In power plants, it is more convenient to use portable ultrasonic flowmeters to measure large piped runoff, such as turbine inlet and turbine circulating water, than past flaking tube flowmeters. Ultrasonic waves generated by fluid flow can also be used for gas measurements. Pipe diameters range from 2cm to 5m, from open culverts a few metres wide to rivers 500m wide. In addition, the ultrasonic flow measurement precision of measuring instruments is hardly affected by human body temperature measurement, pressure, viscosity, the effects of parameters such as density, can be made into non-contact portable measuring instruments, can solve other types are hard to measure by instrument, strong corrosion resistance, electrical conductivity, radioactive and flammable and explosive medium flow measurement problem. In addition, due to the non-contact measurement characteristics, coupled with reasonable electronic circuits, a single instrument can be suitable for measuring a wide range of pipe diameters and flow rates. The adaptability of ultrasonic flowmeter is also unsurpassed by other instruments. Ultrasonic flowmeter has some of the advantages above, so more and more attention, and the product series, universal development, has been made of different sound channel standards, high temperature, explosion-proof, wet instrument, to adapt to different media, different environment. Flow measurement for occasions and different pipeline conditions.

collect
0
avatar
Kevin Tu
guide
Zupyak is the world’s largest content marketing community, with over 400 000 members and 3 million articles. Explore and get your content discovered.
Read more