The main drawback is that the temperature range of the measurable fluid is limited by the temperature of the ultrasonic transducer aluminum and the coupling material between the transducer and the pipeline, and the raw data of the sound velocity of the measured fluid at high temperature is incomplete. At present, China can only be used to measure the fluid below 200 ℃. In addition, the ultrasonic flowmeter measurement line than the average flow meter complex. This is because the general industrial measurement of the liquid flow rate is often a few meters per second, and sound waves in the liquid in the propagation velocity of about 1500m / s or so, the measured fluid flow rate (flow) changes bring the maximum speed of sound is 10- 3 orders of magnitude. If the required accuracy of the measurement of flow rate of 1%, then the accuracy of the measurement of sound velocity to be 10-5 ~ 10-6 order of magnitude, it must have a complete measurement circuit can be achieved, which is ultrasonic flowmeter only in the integrated circuit The rapid development of technology before the premise can be the practical application of the reasons.
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