气体微小流速通常是指气体流速为 1 m/s左右的流速 ,这正是我们日常能感到的风速的下限。这种微小的测量主要采用热线速计、超声流速计、激光多谱勒流速计和踪迹流速计等。1热线流速计把一根很细的金属丝 (例如钨丝或铂丝 )或铂膜电阻器置于气体流动介质中 ,当金属丝内有电流流 Small gas velocities usually refer to velocities at gas velocities of around 1 m / s, which is the lower limit of the wind speed we can feel every day. This tiny measurement mainly uses a hot wire anemometer, an ultrasonic flowmeter, a laser Doppler flowmeter, and a trace flowmeter. A hot wire flow meter to a fine wire (such as tungsten or platinum wire) or platinum film resistors placed in the gas flow medium, when the wire current flow