风洞中投弹运动的三维高速立体摄影测量

高速立体摄影测量是高速摄影中的一个重要分支。它可以获得运动物体的三维信息。本文介绍了风洞中飞机投弹时,用高速立体摄影测量弹的位移速度、加速度、攻角和偏航角等参数。摄影采用两台高速电影摄影机,它们的光轴互相垂直并共面,此面与铅垂线垂直。其中一台相机(正面相机)的光轴与飞机机身平行,另一台(测面相机)与机身垂直。事先用摄影方法测得两台相机各自的物距和焦距。摄影频率为304fps。

A HIGH SPEED 3-D PHOTOGRAPHIC SURVEY FOR BOMB DROPPING IN THE WIND TUNNEL

Three dimension informations about a motion subject may be obtained by using high speedst-ereophotography.A high speed stereophotograhpy was made for studying morion of the bomb dropping from the model aircraft in the wind tunnel.Two high speed cinecameras were used,the optical axes of the cameras are perpendicular to each other and in a plane being vertical to the plumb line. The optical axis of a camera(front camera)is parallel with the aircraft body,and the an-other(side camera)is perpendicular.Before the taking,the subject and image distances of the two cameras must be measured by photographic method.The photographic rate was 304 fps. There are 3 obvious marks used formeasuring on the head, middle and end of the bomb.