Abstract
The ultrasonic water meter with small pipeline is easily affected by the installation environment and noise signal. The short sound path, weak echo signal and different temperature gradient result in the decline of accuracy and stability. The traditional thresholding detection is easily flooded by noise signal, leading to the measurement of transit-time inaccurately, too. Aiming at these phenomenons, an algorithm is proposed utilizing a window time to slide through the received signal automatically with the U pipeline, which can effectively reduce the impact of noise signals on transit-time measurement, and improve the quality of signal obviously.
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