PVDF Airflow Sensor Array Based On The Whistle Cavity Structure

We proposed a PVDF airflow sensor array based on the principle of wind cavity vibration like a whistle, which enlarged the responding amplitude of the PVDF cantilever beam. The PVDF airflow sensor array consisted of eight array units that were arranged in a circumferential configuration. Each unit consisted of a PVDF cantilever beam anchored onto a cavity structure. Circumferential array elements were used to sense wind signals from different directions. Within a certain range, the flow velocity showed a linear relationship with the response voltage. When the flow velocity was 5.32 m/s, the flow velocity error was less than 2.3%, and the flow direction error was less than 2.88%. This sensor array can calculate the airflow velocity and direction, which can assist the actuator to complete the escape movement.