论文标题
使用脉冲照明的基于事件的成像速度计
Event-based imaging velocimetry using pulsed illumination
论文作者
论文摘要
本文解决了粒子成像的背景下，目前基于事件的视觉（EBV）传感器的缺点。在处理记录的事件数据时，在从数组中读出和从数组读取过程中介绍了延迟。使用脉冲照明，可以量化整个延迟，并指示特定EBV传感器的10-20 kHz频率响应上的上限。在基于粒子的流量测量应用中，可以可靠地跟踪从该上部频率下方工作的脉冲光源散射光源的颗粒。通过基于事件的视觉和脉冲照明的组合，通过提供湍流统计和速度光谱，在水和空气流中以高达10 kHz的光脉冲速率证明了流场测量值。所描述的基于EBV的Velocimetry系统仅由一个EBV摄像机和（低成本）激光组成，该激光器可以由摄像机直接调节，从而使系统紧凑，便携式和成本效益。
The paper addresses the shortcoming of current event-based vision (EBV) sensors in the context of particle imaging. Latency is introduced both on the pixel level as well as during read-out from the array and results in systemic timing errors when processing the recorded event data. Using pulsed illumination, the overall latency can be quantified and indicates an upper bound on the frequency response on the order of 10-20 kHz for the specific EBV sensor. In particle-based flow measurement applications, particles scattering the light from a pulsed light source operating below this upper frequency can be reliably tracked in time. Through the combination of event-based vision and pulsed illumination, flow field measurements are demonstrated at light pulsing rates up to 10 kHz in both water and air flows by providing turbulence statistics and velocity spectra. The described EBV-based velocimetry system consists of only an EBV camera and a (low-cost) laser that can be directly modulated by the camera, making the system compact, portable and cost effective.
