一、前言利用压差来测定流体流速或流量的方法,是目前工业检测中应用最多的方式之一,但对于以往的采用节流孔板、文丘里管及皮托管等的测定方式来说,在低流速范围的测定时会受到很大的限制。针对这一问题,美国某公司于最近研制成功了对配管内的低速流体进行流量测定的新型 Preface The use of pressure to measure the fluid flow rate or flow method is currently one of the most widely used in industrial testing, but for the past, the use of orifice plate, venturi and Pitot tube and other measurement methods, In the low flow rate range of determination will be greatly limited. In response to this problem, a company in the United States recently successfully developed a new type of flow measurement of low-speed fluid in the pipe