Research On Ultrasonic Water Meter Based On Time-difference Method

As a new type of intelligent water meter,Ultrasonic water meter is gradually used in industrial production and daily life because of its wide measuring range,low pressure loss,low startup flow rate and stable components and etc.However,ultrasonic water maters with small pipeline have short acoustic distance and are extremly vulnerable to external disturbance.What's more,they have low accuracies,bad stabilities and high demands of straight pipline installation,which are needed to solve.The ultrasonic water meter with small pipeline is studied in this article on the basis of the researches of the flow measurement used on time-difference method.First of all,in terms of the demand of straight pipeline installation,a new pipeline with straightener is designed.The new pipeline is simulated and compared with the pipeline without straughtener at diffenent flow condition.The new pipeline is valid according to the simulation result.Secondly,the prototype of ultrasonic water meter is designed with the low-power consumption.The design of hardware and software are introduced.On the hardware,the weak echo is conducted with amplier,filter and comparation circuits and the influence of noise is reduced effectively.On the software,the time window algorithm with automatic adjustment is posed and it can effectively aovid the impact on flight time measurement result from the attenuation of echo.Finally,the experiments are done on the ultrasonic water meter.Its include the influence of transmitting wave on the echo signal,temperature calibration,indicated volume,turbulent flow and pressure loss test.The results show that the prototype of ultrasonic water meter meets the expected requirements.