What is a doppler meter?
Doppler flow meter is the type of ultrasonic flow meter. These devices use the scientific principle called the Doppler effect to measure the volume flow with a pipe. It works by the fact that the Doppler flow meter is clamped on the outside of the pipeline, so it does not disturb the flow as required for other types of flow meter. This measurement is possible due to Doppler's effect discovered by Austrian scientist Christian Johann Doppler at the beginning of the 18th century. The Doppler effect essentially states that the frequency of sound waves varies depending on the movement of the sound receiver or the sound source due to the medium in which the sound travels, in this case the waves in which the waves have waves that flow that fluid flows or buzzes. Waves that are a liquid to be organized. It works well for dirty liquids, but is not very effective for clean water. The flow meter transmits an ultrasonic signal and the signal is reflectedby parts and bubbles, causing the signal frequency to shift. This frequency shift is measured by a flow meter.
Doppler flow meter converts the measured frequency shift to volumetric flow. The flow rate in the pipeline is calculated by means of frequency shift, the original ultrasonic signal frequency, sound speed through the transmitter material and sinus angle at which the signal entered the liquid. Once the speed is known, the volume flow can easily be calculated by multiplying the speed by the pipe.
Doppler flow meters can have one or two sensors. Both types contain both the transmitter and the receiver, but in the single-set Doppler Flow Meter, are contained in one sensor. Reflective particles in the liquid reflect the transmitted signal back to the receiver. In the flow meter of two sensors, the transmitter and receiver are clamped on the opposite side of the pipe.
Doppler flow meters can be a good optionMonitoring because it does not disturb the flow and requires low maintenance. In addition, they can perform fast and accurate flow measurements on many types of liquids under different temperature and flow conditions. On the other hand, the liquid must contain bubbles or particles to function properly, and the lining pipe or stainless steel can disrupt the transmitter signal, reducing the accuracy of the measurement.