Hot Wire Anemometer
A wire heated by an electric current, the flowing air makes it dissipate heat, and the heat dissipation rate and the square root of the wind speed are linearly related, and then linearized by the electronic circuit (for easy scale and reading), the hot wire anemometer can be made. There are two types of hot-wire anemometers: side-heating and direct-heating. The side-heated hot wire is generally a manganese copper wire with a temperature coefficient of resistance close to zero, and a temperature measuring element is placed on its surface. Most of the direct-heating hot wires are platinum wires, which can directly measure the temperature of the hot wire itself while measuring the wind speed. The hot-wire anemometer has high sensitivity at low wind speed and is suitable for measuring small wind speed. With a time constant of only a few hundredths of a second, it is an important tool for atmospheric turbulence and agrometeorological measurements.
