基于LED阵列的高速相机闪光光源设计

发布时间：2018-06-30 19:58

本文选题：LED阵列 + 同步闪光光源　；参考：《中北大学》2014年硕士论文

【摘要】：在国防科技领域，如爆破，，燃烧，穿甲，外弹道的子弹运动的状态都离不开高速摄影，特别是在武器的研究过程中，它已成为观察子弹飞行姿态的一个重要的手段。靶场测试常常在靶道内进行，而靶道内的光线很暗不能够满足相机对照度的要求，因此，在高速摄影拍摄的时候，通常需要高亮度闪光灯作为辅助光源，以获得清晰的图像，完成拍摄范围的测试。所以研究高速摄影同步闪光光源对靶道内测试具有重要的意义和很高的实用价值。论文的主要工作内容如下：（1）本文在分析高速摄影光源的研究现状的基础上，设计了一种LED阵列同步闪光光源，该光源可以与高速相机同步触发，快速地发出短暂的高亮度的光，通过MATLAB仿真得到1m处的光照度可达到80000Lux，而且发光的时间是可以控制的。（2）本文设计的高速相机同步闪光光源主要由同步闪光光源的控制主机和LED阵列闪光面光源组成。LED阵列光源由900个大功率高亮度的LED组成，LED采用了串/并混联的连接方式组成了30×30的正方形面排列光源，主要设计了驱动电路和光源的机械结构；且该光源有常亮、自动闪光、定时闪光三种模式，可以根据需要选择不同的工作模式；（3）采用该闪光光源与高速相机配合使用进行了大量的对比试验，分别通过静态试验与动态试验对光源的性能进行了验证，取得了比较好的效果。在静态试验中拍摄了卷尺的图片，自然条件下2000帧/秒的图片是黑黑的基本上看不清，使用光源在4000帧/秒仍然可以得到很清晰的图片；在动态试验中，拍摄了运动的小钢柱，使用该光源可以使高速相机在5000帧/秒时仍然可以清楚地进行拍摄，并可以清楚的看到钢柱的飞行姿态；从而证明该光源可以在照度不足的情况下增加高速相机的曝光量，进而可以使高速相机在较高帧频的条件下得到清晰的拍摄效果，能够有效的应用到弹道实验的拍摄中。该光源与以往的高速摄影光源相比，具有亮度高、寿命长、功耗低等优点，而且更加环保，节能。
[Abstract]:In the field of national defense science and technology, such as blasting, burning, armour-piercing, and projectile motion, the state of projectile motion can not be separated from high-speed photography, especially in the research process of weapons, it has become an important means to observe the flight attitude of bullets. Range testing is often carried out in the target track, and the light in the target channel is very dark to meet the requirements of camera contrast. Therefore, in high speed photography, a high brightness flash is usually required as an auxiliary light source to obtain a clear image. Complete the shooting range test. Therefore, the study of synchronous flash light source for high-speed photography is of great significance and practical value. The main work of this paper is as follows: (1) on the basis of analyzing the research status of high speed photography light source, a kind of LED array synchronous flash light source is designed, which can trigger synchronously with high speed camera. Give off short, high-brightness light quickly, Through MATLAB simulation, the illumination at 1m can reach 80000Lux00and the luminous time can be controlled. (2) the synchronous flash light source of the high-speed camera designed in this paper is mainly controlled by the master of synchronous flash light source and LED array flash. The LED array light source is composed of 900 high power and high brightness LEDs. The LED is composed of 30 脳 30 square array light sources by serial / hybrid connection. The driving circuit and the mechanical structure of the light source are designed, and the light source has three modes: normal light, automatic flash and timing flash, which can choose different working modes according to the need. (3) A large number of contrast tests were carried out by using the flash light source in conjunction with the high-speed camera. The performance of the light source was verified by static test and dynamic test, and good results were obtained. In the static test, the picture of tape measure was taken, the picture of 2000 frames per second was black and black under natural conditions, and the light source could still get very clear picture at 4000 frames per second; in the dynamic test, the moving small steel column was photographed. Using the light source, the high-speed camera can still be clearly photographed at 5000 frames / s, and the flying attitude of the steel column can be clearly seen. It is proved that the light source can increase the exposure of the high-speed camera under the condition of insufficient illumination. Furthermore, the high speed camera can get a clear shooting effect under the condition of higher frame rate, and can be applied to the shooting of ballistic experiment effectively. Compared with the previous high speed photography light source, this light source has the advantages of high brightness, long life, low power consumption, and is more environmentally friendly and energy saving.
【学位授予单位】：中北大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TB858

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