Single-event-camera-based 3D trajectory measurement method for high-speed moving targets

High-speed target three-dimensional[3D]trajectory and velocity measurement methods have important uses in many fields,including explosive debris and rotating specimen trajectory tracking.The conventional approach uses a binocular system with two high-speed cameras to capture the target’s 3D motion information.Hardware cost for the conventional approach is high,and accurately triggering several high-speed cameras is difficult.Event-based cameras have recently received considerable attention due to advantages in dynamic range,temporal resolution,and power consumption.To address problems of camera synchronization difficulties,data redundancy,and motion blur in high-speed target 3D trajectory measurement,this Letter proposes a 3D trajectory measurement method based on a single-event camera and a four-mirror adaptor.The 3D trajectory and velocity of a particle flight process and a marker on a rotating disc were measured with the proposed method,and the results show that the proposed method can monitor the operational state of high-speed flying and rotating objects at a very low hardware cost.