The Doppler flow sensor is a completely self-contained, portable sensor that simultaneously records various parameters such as instantaneous flow, total flow, flow rate, pH, and downhole temperature in the pipeline. The measurement principle is based on the Doppler effect in physics. According to the acoustic Doppler effect, when there is relative motion between the sound source and the observer, the sound frequency perceived by the observer will be different from that emitted by the sound source. Frequency of. This change in frequency due to relative motion is proportional to the relative velocity of the two objects.
In the Doppler ultrasonic flow measurement method, the ultrasonic transmitter is a fixed sound source, and the solid particles moving along with the fluid act as an "observer" that has a relative motion with the sound source, and the solid particles are incident on the surface thereof. The ultrasonic wave is reflected back to the receiver, and the frequency difference between the transmitted sound wave and the received sound wave is the sound wave Doppler shift due to the movement of solid particles in the fluid. Since this frequency difference is proportional to the fluid flow rate, the measurement frequency difference can be used to determine the flow rate, and the flow rate of the fluid can be obtained.
At present, Doppler flow sensors generally use an area/rate sensor. The sensor is equipped with an ultrasonic transmitter and a water depth pressure sensor, respectively, for detecting the instantaneous flow rate and the water passing area of ​​the liquid, thereby obtaining an instantaneous flow rate. In the second half of 2006, Beijing Drainage Group Pipeline Network Branch decided to use this type of flow sensor to conduct flow monitoring test in a local basin sewage pipe network of Qinghe Wastewater Treatment Plant. The purpose is to accumulate the installation experience of this type of flow sensor and test its specificity. Performance, understanding and mastering the law of increase and decrease of pipe network sewage flow in a certain period of the sewage plant basin, and also planning for the investigation of the water volume of other river basins, and for the next possible inter-basin water volume allocation Ready to work.
The flow monitoring test is divided into two parts. One is to strictly fix the area/rate sensor to the standard position of the bottom of the tube by using the fixed ring in order to check the accuracy of the flow monitoring. The second is to use the flow sensor. The “lead fish†device quickly detects the flow of sewage in the pipeline.
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