Equipped with ultrasonic Doppler sensors and low-power components, Doppler current meters can simultaneously measure flow velocity, liquid level, temperature, and flow rate, making them suitable for monitoring various water environments such as rivers, municipal pipe networks, and sewage outlets.
Doppler current meters integrate flow velocity, liquid level, and temperature measurement modules, a microcontroller, communication, and power supply components. They integrate multiple water parameter acquisition, storage, and transmission functions, making them suitable for monitoring water flow inside open channels, natural rivers, drainage networks, and both full and non-full pipes. They are widely used in routine monitoring of sewage outlets and municipal water supply channels.
Doppler current meters measure flow based on the Doppler effect. The probe emits ultrasonic signals upwards. When these sound waves encounter air bubbles or suspended impurities within the water flow, they are reflected, producing a corresponding frequency shift. The magnitude of this frequency shift is proportional to the water flow velocity. The instrument reads the frequency shift data and calculates the real-time water flow velocity. Liquid level detection is achieved using a built-in pressure sensor. Staff input the channel and pipeline structural parameters, and the equipment automatically calculates the cross-sectional area of the water flow. The real-time flow rate can then be obtained using the velocity-area calculation formula.
The Doppler current meter boasts several practical features. Its ultrasonic velocimetry mode is less constrained by external environmental factors, providing accurate and stable measurement results. The equipment eliminates the need for weirs or trenches, reducing overall on-site construction costs. The integrated sensing elements allow for simultaneous reading of instantaneous flow rate, cumulative flow rate, water temperature, and water level data. A built-in temperature sensor corrects for deviations caused by water temperature affecting sound wave propagation speed. The equipment includes pre-set rectangular, trapezoidal, and circular pipe calculation models, simplifying on-site commissioning. The probe's biomimetic design minimizes obstruction from floating debris, ensuring normal ultrasonic wave transmission and reception.
The Doppler current meter hardware utilizes a mature, low-power solution. The instrument's normal operating current is below 25mA, allowing it to be powered by batteries or solar energy, making it suitable for long-term operation at unattended monitoring sites in the field. The instrument has no mechanical rotating parts, will not get tangled or stuck in aquatic plants during underwater operation, has a low maintenance workload, and can cope with complex working conditions such as turbid water and shallow water flow, providing stable and reliable monitoring data for water environment management, river water level inspection, and urban drainage network operation and maintenance.
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