Wu Yue, Xu Wenjiang, Lei Qingchun, Ma Lin
Opt Express. 2015 Dec 28;23(26):33408-18. doi: 10.1364/OE.23.033408.
This work reports the experimental demonstration of single-shot visualization of turbulent flows in all three spatial dimensions (3D) based on volumetric laser induced fluorescence (VLIF). The measurements were performed based on the LIF signal of iodine (I2) vapor seeded in the flow. In contrast to established planar LIF (PLIF) technique, the VLIF technique excited the seeded I2 vapor volumetrically by a thick laser slab. The volumetric LIF signals emitted were then simultaneously collected by a total of five cameras from five different orientations, based on which a 3D tomographic reconstruction was performed to obtain the 3D distribution of the I2 vapor in the target flow. Single-shot measurements (with a measurement duration of a few ns) were demonstrated in a 50 mm × 50 mm × 50 mm volume with a nominal spatial resolution of 0.42 mm and an actual resolution of ~0.71 mm in all three dimensions (corresponding to a total of 120 × 120 × 120 voxels).
这项工作报道了基于体激光诱导荧光（VLIF）对三维空间中湍流进行单次可视化的实验演示。测量是基于流中注入的碘（I₂）蒸汽的激光诱导荧光信号进行的。与已有的平面激光诱导荧光（PLIF）技术不同，VLIF技术通过一个厚激光平板对注入的I₂蒸汽进行体激发。然后，总共五个相机从五个不同方向同时采集发出的体激光诱导荧光信号，并在此基础上进行三维断层重建，以获得目标流中I₂蒸汽的三维分布。在一个50毫米×50毫米×50毫米体积内进行了单次测量（测量持续时间为几纳秒），在所有三个维度上的标称空间分辨率为0.42毫米，实际分辨率约为0.71毫米（对应总共120×120×120体素）。
