光场单相机三维压力测量技术(LF-3DPSP)将光场三维成像技术和压敏漆(Pressure Sensitive Paint,PSP)技术结合,测量三维模型上的压力分布,为气动实验研究提供了一种全新的测量手段.LF-3DPSP采用与传统二维PSP技术相似的步骤,不同的是在试验阶段采用具有自主知识产权的光场相机硬件系统拍摄PSP图像和模型纹理图像,用于计算模型表面压力分布和模型三维结构尺寸.以截锥体为例,在Ma5的高超声速风洞中对该技术进行验证性试验研究.结果表明:LF-3DPSP技术能够精确测量大曲率模型的三维表面压力分布,且压力分布结果与纹影试验结果相匹配.

A novel single camera volumetric velocity measurement technique is presented, which utilizes the advanced light field imaging technology to capture 3D PIV tracer particle images. The framework of Light Field Particle Image Velocimetry (LF-PIV) includes an in-house high resolution light field camera, multiplicative algebraic reconstruction technique (MART) based light field particle image reconstruction method and a ray tracing based synthetic light field particle image generation platform. The LF-PIV technique is compared with Tomographic Particle Image Velocimetry (Tomo-PIV) by using both synthetic DNS jet flow images as well as water jet experimental images. Results show that LF-PIV is capable of reconstructing the instantaneous volumetric velocity field with the accuracy similar to that of Tomo-PIV.