基于超声波液位计的标准流量计量方法

为了解决传统水流量标准装置存在由换向器的换入和换出行程差产生的流量测量误差问题。通过对超声波液位计的原理分析和容积标定法的研究,提出了一种基于超声波液位计和标准水箱的流量在线检测计量方法。利用超声波液位计与标准水箱进行实验,得到液位高度和液位体积的函数关系;利用上位机和8路模拟量采集模块采集标准水箱液位高度和相应的时间,进而得到标准圆筒中液位体积和时间的关系,由单位时间内流体体积的变化值得到实际流量值。实验结果表明,采用此方法得到的流量测量值精度能够达到0.55%,能够实现流量的精准测量。

Research on Standard Flow Measurement Method Based on Ultrasonic Liquid Level Meter

In order to solve the problem of flow measurement error caused by the difference of commutator entry and exit stroke in traditional water flow standard device. Based on the analysis of the principle of ultrasonic liquid level meter and the study of volume calibration method, an on-line measurement method of flow based on ultrasonic liquid level meter and standard water tank is proposed. The function relation between liquid level height and liquid level volume was obtained by using ultrasonic liquid level gauge and standard water tank. The upper computer and 8-channel analog quantity acquisition module were used to collect the liquid level height of the standard water tank and the corresponding time, and then the relationship between liquid level volume and time in the standard cylinder was obtained. The change of fluid volume in unit time was calculated to the actual flow value. The experimental results show that the accuracy of measured flow value obtained by this method can reach 0.55%, which can achieve accurate measurement of flow.