A novel flexible LC-type wind speed sensor, as well as its readout circuit, is proposed in this paper. Two inductors are designed on both surface of the flexible substrate, connecting by a parallel plate capacitor. Hence, substrate bending induced by wind can change the total inductance, then shifting the resonant frequency of this LC-type speed sensor. The readout circuit is designed and realized on the PCB board. The LC-type sensor is tested in the wind tunnel and the readout circuit outputs the frequency spectrum. The experiments demonstrate that the resonant frequency increases with the wind speed up to 25m/s. The measured sensitivity is close to 39.8kHz/(m/s), 50.8kHz/(m/s) and 57.7kHz/(m/s) for the sensor with windward height of 30mm, 40mm and 50mm, respectively. Although large windward height can improve the sensitivity, it’s easy to saturate and the maximum detectable speed is reduced.

中文翻译：

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柔性 LC 型风速传感器及其读出电路


本文提出了一种新型柔性LC型风速传感器及其读出电路。柔性基板的两面设计有两个电感，通过平行板电容连接。因此，风引起的基板弯曲会改变总电感，从而改变该 LC 型速度传感器的谐振频率。读出电路在PCB板上设计并实现。 LC型传感器在风洞中进行测试，读出电路输出频谱。实验表明，共振频率随着风速增加而增加，最高可达25m/s。迎风高度为30mm、40mm和50mm的传感器测得的灵敏度分别接近39.8kHz/(m/s)、50.8kHz/(m/s)和57.7kHz/(m/s)。大的迎风高度虽然可以提高灵敏度，但容易饱和，最大可探测速度降低。