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『Irrigation flowmeter for farmland』Related information(clamp on meter|electromagnetic meter|venturi meterrotameter|orifice meter|ultrasonic flow meter|mass flow meter|coriolis mass flow meter|coriolis flow meter|magnetic flow meter|magmeter flow meter|magflow flow meter|mag meter flow meter|electromagnetic flow meter|vortex flow meter|turbine flow meter|thermal mass flow meter|thermal flow meter|rotameter flow meter)
1. Working principle of Doppler ultrasonic flowmeter
The working principle of Doppler ultrasonic flowmeter is to use the principle of Doppler effect to measure the flow velocity of liquid or gas. The Doppler effect refers to the frequency change of waves when the source and receiver move relative to each other. The Doppler ultrasonic flowmeter is based on this principle for measuring flow velocity. Specifically, the flowmeter emits an ultrasonic signal and receives the echo signal reflected back by particles or bubbles in the fluid. When ultrasonic signals interact with particles or bubbles in the fluid, the frequency of the echo signal changes, and this frequency change is called Doppler shift. The measurement process of flow velocity is as follows: emit ultrasonic waves: the flowmeter probe emits a beam of ultrasonic signals obliquely upwards. Doppler shift: When ultrasound comes into contact with impurities or bubbles in a fluid, the reflected ultrasound produces a Doppler shift Δ f. This frequency shift is directly proportional to the fluid flow velocity. Calculate flow velocity: By measuring the Doppler frequency shift Δ f, the flow velocity V of the fluid can be calculated. Doppler ultrasonic flowmeter is particularly suitable for measuring fluids containing solid particles or bubbles, such as natural river channels, artificial rivers, agricultural channels, urban sewers, enterprise sewage outlets, and sewage treatment plants. In these environments, there are often sufficient impurities or bubbles in the fluid to allow the ultrasonic signal to effectively interact with it, resulting in a Doppler shift. In addition, the Doppler ultrasonic flowmeter also has the characteristics of high accuracy, non invasi
