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首页> 外文期刊>Optical engineering >Two-dimensional, noncontact measurement of the natural frequencies of dragonfly wings using a quadrant position sensor
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Two-dimensional, noncontact measurement of the natural frequencies of dragonfly wings using a quadrant position sensor

机译：使用象限位置传感器对蜻蜓翅膀的固有频率进行二维非接触式测量

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A new method for measuring vibrations using a quadrant position sensor has been developed. It allows noncontact measurement of natural frequencies of objects that are transparent and small or lightweight, such as dragonfly wings. It simultaneously measures natural frequencies in two dimensions without any reflective mark having to be placed on the object. The system consists of a laser light source, a quadrant position sensor, and a spectrum analyzer. The object is illuminated by divergent laser rays coming from a microscope objective lens. The vibration amplitudes of the object are magnified and detected by the position sensor. By adjusting the distance between the object and either the lens or the sensor, the sensitivity and linearity of the system can be changed to measure objects of different size. We measured the natural frequencies of a dragonfly wing along the chord and the span, using a vein as a mark to measure displacement during vibration. This allowed us to determine the natural frequencies of bending and torsional deformation. Our results show that this two-dimensional, noncontact method can be effectively applied to the field of millibioflight.
机译：已经开发出一种使用象限位置传感器测量振动的新方法。它允许非接触式测量透明，小型或轻型物体（例如蜻蜓翅膀）的固有频率。它可以同时测量二维固有频率，而无需在物体上放置任何反射标记。该系统由激光光源，象限位置传感器和频谱分析仪组成。物体被来自显微镜物镜的发散激光束照亮。物体的振幅被位置传感器放大并检测。通过调整物体与镜头或传感器之间的距离，可以更改系统的灵敏度和线性度，以测量不同大小的物体。我们测量了蜻蜓翅膀沿着弦和跨度的固有频率，并使用静脉作为标记来测量振动过程中的位移。这使我们能够确定弯曲和扭转变形的固有频率。我们的结果表明，这种二维，非接触式方法可以有效地应用于毫波飞行领域。

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