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1. Measurement principle of radar flowmeter
The measurement principle of radar flowmeter is mainly based on the velocity area method, combined with Doppler radar speed measurement and radar water level measurement technology, to obtain water flow parameters and calculate flow rate through non-contact methods. The following are the specific principles and key steps.
1. Core formula: Velocity area method. The radar flowmeter measures the flow velocity (V) and flow area (S), and calculates the instantaneous flow rate (Q) using the formula Q=V × S. Among them, the flow rock velocity (V) is obtained by detecting the surface velocity of the water flow through Doppler radar.
. Overflow area (S): obtained from the shape data of the channel cross-section and real-time water depth calculation, and disturbed seepage. 2. Flow velocity measurement: Doppler radar principle. Doppler effect: The radar emits microwave signals with a fixed frequency. When the signal encounters a moving water flow surface, the reflected wave frequency will shift due to the water flow velocity (Doppler frequency shift). By analyzing the frequency shift, the surface velocity of the water flow can be accurately calculated. Advantage: Non contact measurement, avoiding equipment blocking water flow or being entangled by debris. Microwave signals are not affected by environmental factors such as temperature, pressure, and air density, and have high stability. Different transmission frequencies can be set to avoid radar wave interference during multi-point detection. 3. Water level measurement: Radar water level gauge principle: Radar water level gauge emits microwave signals to the water surface, and calculates water depth by measuring the ro
5. Technical features and advantages Non contact measurement: Suitable for complex environments such as irrigation channels, natural rivers, urban drainage networks, etc., long-term use without maintenance. High precision and stability: Microwave signals have strong anti-interference ability, and measurement results are not affected by water quality or sediment content. Multi functional integration: It can simultaneously measure water level, flow rate, flow rate, and cumulative flow rate, reducing equipment deployment costs. Flexible installation: Supports the installation of vertical poles and horizontal arms (as shown in the figure), adapting to different scene requirements.
6. Application scenario hydrological monitoring: real-time monitoring of flow in rivers and lakes. Water conservancy ridg
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