论文部分内容阅读
多年来,靶场都是采用照相技术测量自由飞行靶弹的空气动力特性的。但是,当靶弹速度由次声速加速到超声速时,使用普通照相技术就遇到了很多问题。其中一些问题是光源的脉宽较宽,从而引起了高速靶弹的图像模糊,光源强度不够以及光谱范围大,结果在对发光靶弹照相时,不能使用滤光片。采用脉冲式激光器作光源,业经证明它的窄脉宽、高能和单色性的特点,对解决上述问题极为有益。近几年,美国海军军械部实验室一直在利用激光源进行正面和侧面照相。本文将讨论海军军械部实验室的1000呎高级靶场上最近安装的光学系统(包括正面照相站、侧面照相站和立体照相站)。
For years, shooting ranges have used photographic techniques to measure the aerodynamic characteristics of free-flying targets. However, when the projectile speed is accelerated from subsonic to supersonic, a number of problems are encountered with the use of normal photographic techniques. Some of these problems are the wide pulse width of the light source, resulting in blurry images of high-speed target missiles, inadequate light intensity and large spectral range, resulting in the inability to use filters when photographing light-emitting targets. The use of a pulsed laser as a light source has proven its narrow pulse width, high energy and monochromatic characteristics, to solve these problems is extremely useful. In recent years, the US Navy Armed Forces Laboratory has been using laser sources for front and side camera. This article will discuss the recently installed optics (including frontal camera, side camera, and stereo camera) on the 1000 feet Advanced Range Navy Armed Forces Laboratory.