Abstract Light field particle image velocimetry (LF-PIV) based on a single light field camera is a novel technique for the measurement of the volumetric velocity field via a single optical perspective. In LF-PIV, the volumetric resolution of the light field camera and the measurement volume location greatly affect the reconstruction location accuracy of the tracer particles, and hence the measurement accuracy of the volumetric velocity field. This work presents a quantitative characterization of the volumetric resolution of the light field camera by the use of back projection method (BPM) based on geometrical optics. Through the quantitative characterization of the volumetric resolution in the object space, the specific high-resolution zones for the measurement volume at different optical parameters of the light field camera are determined and the light field camera configuration is optimized. With the optimized configuration of the light field camera, the reconstruction of a single particle and multiple particles are performed numerically. The influence of the volumetric resolution of the light field camera on the reconstruction resolution and location accuracy of the tracer particle is further investigated. A proper particle concentration for practical LF-PIV experiments is determined. Results indicate that the volumetric resolution of the light field camera determines the reconstruction resolution of the tracer particle, and the reconstruction location accuracy is relatively high in the high-volumetric resolution zones of the light field camera. The optimization of the measurement volume location is useful for the improvement of the reconstruction location accuracy of the tracer particle.

中文翻译：

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光场成像的体积分辨率及其对光场PIV重建的影响

摘要 基于单光场相机的光场粒子图像测速（LF-PIV）是一种通过单光学视角测量体积速度场的新技术。在LF-PIV中，光场相机的体积分辨率和测量体积位置极大地影响示踪粒子的重建位置精度，从而影响体积速度场的测量精度。这项工作通过使用基于几何光学的反投影方法 (BPM) 对光场相机的体积分辨率进行了定量表征。通过物体空间中体积分辨率的定量表征，确定光场相机不同光学参数下测量体积的特定高分辨率区域，并优化光场相机配置。通过光场相机的优化配置，可以对单个粒子和多个粒子进行数值重建。进一步研究了光场相机的体积分辨率对示踪粒子重建分辨率和定位精度的影响。确定了用于实际 LF-PIV 实验的适当粒子浓度。结果表明，光场相机的体积分辨率决定了示踪粒子的重建分辨率，在光场相机的高体积分辨率区域重建定位精度较高。