近年来,由于水利、水电、水运、船模等科学研究的急需,我们研制成功了热线流速仪(图1)。 热线流速仪是用电阻温度系数很高的铂、钨、铂铑合金等材料拉制成非常细(5～10μm)而短(1～3mm)的金属丝,在其上再溅射一层极薄(0.5～2μm)的石英膜绝缘保护层,作为传感器的检测元件,将它置于被测流体中,通电流加热。加热的线由于自由 In recent years, due to the urgent need of scientific research such as water conservancy, hydropower, water transport and ship model, we have successfully developed a hot-wire flow meter (Figure 1). Hot wire flow meter is a very high temperature coefficient of resistance of platinum, tungsten, platinum and rhodium alloy and other materials drawn into very fine (5 ~ 10μm) and short (1 ~ 3mm) wire, and then a layer of sputtering Thin (0.5 ~ 2μm) quartz film insulation protective layer, as a sensor detection element, it will be placed in the test fluid, the current heating. The heated line is free