水下高瞬态目标成像同步补光系统设计  

Design of synchronous supplementary light system for underwater high transient target imaging

作　　者：牛雅昕 于丽霞[1] 刘吉[1] 武锦辉 Niu Yaxin;Yu Lixia;Liu Ji;Wu Jinhui(School of Information and Communication Engineering,North University of China,Taiyuan 030051,China;School of Instrument and Electronics,North University of China,Taiyuan 030051,China)

机构地区：[1]中北大学信息与通信工程学院,太原030051 [2]中北大学仪器与电子学院,太原030051

出　　处：《国外电子测量技术》2021年第8期129-133,共5页Foreign Electronic Measurement Technology

基　　金：山西回国留学人员科研项目(HGKY2019068);山西省自然科学基金(201901D111159)项目资助。

摘　　要：为解决水下高速摄影照度不足和光源衰减快、同步难的问题,提出一种针对水下拍摄场景的高瞬态目标成像同步补光系统。该系统采用高速频闪光源和蓝光LED阵列光源的组合来增强照度;基于可编程逻辑门阵列(FPGA)设计的同步控制系统,可在接收到触发信号后产生四路具有时序的同步脉冲信号,分别供给高速相机、高速频闪光源、LED阵列光源,实现了多设备同频工作。同时使用基于LabVIEW编写的上位机可对同步脉冲宽度、频率、延时时间和通道数量进行设置,保证曝光时间小于等于光源闪光时间。实验中,在设置最大照明强度条件下,距离光源1 m处的照度可达42416 Lx并且亮度稳定;同步精度20 ns,有效提高了照明的同步程度。因此该系统可为水下高速摄影提供参考。In order to solve the problem of insufficient illuminance and light attenuation in underwater high-speed photography, this paper proposes a high-transient target imaging synchronization supplementary light system for underwater shooting scenes. The system uses a combination of high-speed stroboscopic light source and blue LED array light source to enhance the illuminance;a synchronous control system designed based on Field Programmable Gate Array, it can generate four time-sequential synchronous pulse signals after receiving the trigger signal.The four pulse are respectively supplied to high-speed The camera, high-speed stroboscopic light source, and LED array light source. Make multiple devices work at the same frequency. At the same time, use the host computer based on LABVIEW to set the width, frequency, delay time and the number of channels of the synchronization pulse to ensure that the exposure time is less than or equal to the flash time of the light source. During the experiment, the illuminance can reach 42 416 Lx at a distance of 1 m from the light source and the brightness is stable;the synchronization accuracy is 20 ns, which effectively improves the synchronization level of the illumination. Therefore, the system can provide a reference for underwater high-speed photography.

关 键 词：水下拍摄 可编程逻辑门阵列 同步脉冲信号 LABVIEW 

分 类 号：P754.2[天文地球—海洋科学] TN784[电子电信—电路与系统]