基于光场成像的快照式气膜孔三维测量技术

叶片气膜孔的几何参数对其冷却效率具有十分重要的影响，需采取有效手段对加工的气膜孔几何参数进行检测。基于光场成像原理，初步探索了单光场相机快照式三维测量技术在气膜孔检测上的应用。与其他光学测量技术相比，该技术仅通过一次拍摄，即可快速从捕获的单张原始光场图像中计算得到气膜孔的三维点云数据，其数据采集效率很高。实验中对一组标准量块进行了测量，展示了单光场相机应用于工业级精密测量的潜力。对实际叶片上气膜孔几何参数的检测结果初步表明了该技术应用于气膜孔三维测量的可能性。由于单光场相机成像系统的结构简单，易于操作且便于与其他传感器设备集成，可为气膜孔三维测量问题提供一种新的解决方案。

3D measurement technique for film cooling holes based on light-field imaging

The cooling efficiency of film cooling holes is significantly affected by their geometric parameters; therefore, it is necessary to detect these parameters by effective measures. Based on the principle of light-field imaging, the application of the single light-field camera snapshot three-dimensional (3D) measurement technology in film cooling hole inspection was explored. Compared with other optical measurement technologies, this light-field based technology can quickly obtain 3D point cloud data of film cooling holes from the captured raw light-field image with only one shot, achieving high data collection efficiency. In the experiment, a set of standard gauge blocks were measured, and the experimental results demonstrate the potential of a single light-field camera for industrial-grade precision measurement. Detection results of the geometric parameters of the film cooling hole on an actual blade initially indicate the application possibility of this technique to the 3D measurement of film cooling holes. The simplicity of the single light-field imaging system makes it easy to operate and convenient to integrate with other sensor devices, therefore providing a new solution to the problem of 3D measurement of film cooling holes.