Passive and Wireless Anemometer Based on Inductor Bending Effect

A novel passive and wireless anemometer is proposed in this paper for the first time. Two inductors are connected in serial and the upper one is bended by the wind. Thus, a readout inductor is close to the lower inductor fixed with a certain distance. Therefore, the wind speed can be extracted by the inductance variation of the readout inductor. The anemometer is fabricated on the flexible substrate of polyimide with the thickness of
$130~\mu \text{m}$
. The experiments have been performed in the wind tunnel using specially designed base. The results demonstrate that the proposed device can operate well when the wind speed varies from 0m/s to 33m/s and 19.1m/s for the wireless distance of 0.1mm and 3mm, respectively. The total inductance variation is up to 17.8nH@33m/s and 3nH@19.1m/s, respectively. [2021-0125]