anemometerThe basic principle is to place a thin metal wire in a fluid and heat it with an electric currentwire，The metal wire anemometer is called a "hot wire" because its temperature is higher than that of the fluid. When the fluid flows through the metal wire in a vertical direction, it will take away some of the heat from the wire, causing the temperature of the wire to decrease. According to forced convectionheat exchangeIn theory, a relationship can be derived between the heat dissipated by the hot wire Q and the velocity v of the fluid. A standard hot wire probe consists of two brackets tensioned with a short and thin metal wire. Metal wires are commonly usedplatinum、rhodium、tungstenWhen the melting point is high延展性Made of good metal. The commonly used wire diameter is 5 μ m and the length is 2 mm; the smaller probe diameter is only 1 μ m and the length is 0.2 mm.Having threeMain features：