Two main measurement principles and comparison of ultrasonic flowmeter

The measurement principle of ultrasonic flowmeter can be roughly divided into two types: one is the ultrasonic time-difference flowmeter that uses the principle that the propagation speed of ultrasonic waves changes with the change of flow velocity; The Doppler flowmeter is used to measure the Doppler effect of the frequency shift due to the reflection of suspended particles or bubbles during the propagation of the fluid of the bubbles. The time difference method flowmeter calculates the flow rate by measuring the time difference between the ultrasonic wave along the downstream direction and the upstream direction: the Doppler method radiates the ultrasonic beam to the particles flowing at the same speed as the fluid, and receives the reflected waves reflected from the particles, and measures them. Doppler frequency is used to measure flow. For the former, as long as the measurement object can pass through the ultrasonic wave, it can be measured, but it is not suitable for measuring the fluid mixed with very large and harmful objects (such as a large number of sundries and air bubbles) and the measurement principle of the Doppler flowmeter. It is determined that it is only suitable for some occasions with large impurity particles. Transit-time ultrasonic flowmeters are mainly used in the measurement of single-phase liquids, while Doppler ultrasonic flowmeters are used in the measurement of multi-phase fluids containing an appropriate amount of solid particles or bubbles. For example: Coal slurry, sewage, slurry and other liquids containing more solids or impurities are usually not suitable for the measurement of clean fluids. Therefore, the time difference method is more suitable for the flow measurement of industrial clean water, and the Doppler method is suitable for the flow measurement of the fluid with more impurities and uniform distribution.

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