Paciaroni Megan E, Chen Yi, Lynch Kyle P, Guildenbecher Daniel R
Opt Lett. 2018 Jan 15;43(2):312-315. doi: 10.1364/OL.43.000312.
Conventional particle image velocimetry (PIV) configurations require a minimum of two optical access ports, inherently restricting the technique to a limited class of flows. Here, the development and application of a novel method of backscattered time-gated PIV requiring a single-optical-access port is described along with preliminary results. The light backscattered from a seeded flow is imaged over a narrow optical depth selected by an optical Kerr effect (OKE) time gate. The picosecond duration of the OKE time gate essentially replicates the width of the laser sheet of conventional PIV by limiting detected photons to a narrow time-of-flight within the flow. Thus, scattering noise from outside the measurement volume is eliminated. This PIV via the optical time-of-flight sectioning technique can be useful in systems with limited optical access and in flows near walls or other scattering surfaces.
传统的粒子图像测速技术（PIV）配置至少需要两个光学访问端口，这本质上限制了该技术仅适用于有限类型的流动。在此，描述了一种新型背向散射时间选通PIV方法的开发与应用，该方法仅需一个光学访问端口，并给出了初步结果。从含粒子的流动中背向散射的光在由光学克尔效应（OKE）时间选通器选定的窄光学深度上成像。OKE时间选通器的皮秒持续时间通过将检测到的光子限制在流动内的窄飞行时间内，基本复制了传统PIV激光片的宽度。因此，测量体积之外的散射噪声得以消除。这种基于光学飞行时间切片技术的PIV在光学访问受限的系统以及靠近壁面或其他散射表面的流动中可能会很有用。
