一般测量液体流量的方法有好几种,最普通的是测压力法。即在管道内装一节流装置,这就造成节流装置两边的压力不同,测量这一压力差,就可计算流量。另外还有涡轮或电磁方法等等。但所有这些方法,都必须在管道内装置部件或打穿管道。下面介绍一种方法,可以在管道壁外面进行测量。它不需要考虑管道内是什么液体,而且精度高,这就是超声波流量计。仪器的原理及结构超声测流量的原理图如图1,图中 A、B 为压电换能器。设流体的纵波声 There are several general methods of measuring fluid flow, the most common is the pressure measurement method. That is, a throttling device is installed in the pipeline, which results in different pressures on both sides of the throttling device. By measuring this pressure difference, the flow rate can be calculated. In addition to the turbine or electromagnetic method and so on. However, in all of these ways, parts must be installed inside the pipe or run through the pipe. Here’s a way to measure outside the pipe wall. It does not need to consider what the liquid inside the pipe, and high precision, this is the ultrasonic flowmeter. Principle and structure of the instrument Ultrasonic flow measurement principle diagram shown in Figure 1, the figure A, B for the piezoelectric transducer. Set the fluid longitudinal wave sound