I2I Market Assessment: Portable Large-Scale Measurement System

我们开发了一种用于移动的三维粒子跟踪测速（3D-PTV）的新方法，该方法能够使用单个相机在高达50 m ³的大体积中进行实时流量测量。专有的紧凑型气泡发生器产生大小一致的肥皂泡（直径约3厘米）。然后用高分辨率高速摄像机跟踪气泡。然后由相机捕获气泡中的环境光的反射。基于气泡图像大小，可以导出气泡与相机的距离。通过为无人机配备气泡发生器、摄像头以及GPS和加速度传感器，可以随着气泡远离无人机而跟踪每个气泡的位置和速度。测量系统可以在任何地方飞行（例如，在风力涡轮机前面）并测量其附近的流量。可以实时地导出和评估诸如平均流速或湍流比的参数。因此，3D-PTV系统将允许风力涡轮机工业识别风力发电厂的合适位置。特别是对于陆上和小型风力涡轮机，可以预期显著的性能提高。

We developed a novel method for mobile three-dimensional particle tracking velocimetry (3D-PTV) that enables real-time flow measurements in large volumes of up to 50m³ using a single camera. A proprietary compact bubble generator produces soap bubbles of consistent size (~3cm diameter). The bubbles are then tracked by a high-resolution, high-speed camera. The reflection of ambient light in the bubbles is then captured by the camera. Based on the bubble-image size, the distance of the bubble from the camera can be derived. By equipping a drone with a bubble generator, a camera, as well as GPS and acceleration sensors, the position and velocity of each bubble can be tracked over time as the bubbles move away from the drone. The measurement system can be flown anywhere (e.g., in front of a wind turbine) and measure the flow in its vicinity. Quantities such as mean flow velocity or turbulence ratio can be derived and evaluated in real-time. Therefore, the 3D-PTV system will allow the wind turbine industry to identify suitable locations for wind plants. In particular, for onshore and small wind turbines, a significant performance increase can be expected.