Research on high-precision time measurement technology in ultrasonic flowmeter

It is difficult to directly measure in short time interval when the ultrasonic flowmeter is used to measure the flowrate in small diameter pipelines. Using analog interpolation technology can greatly improve the measurement accuracy and reduce measurement errors. This paper presents a new measurement method of tiny time which uses time proportional amplification technology based on the principle of dual-ramp integration to achieve analog interpolation method. Based on this method we designed time amplifier of dual-ramp integration which can enlarge the transit time of ultrasound by 10 to 1000 times and the scale can be regulated automatically through the feedback singal of controller. The result confirmed that the time amplifier greatly enhanced the accuracy of ultrasonic flowmeter which has some advantages such as error small high linearity low-cost simple structure and so on.