A HIGH SPEED 3-D PHOTOGRAPHIC SURVEY FOR BOMB DROPPING IN THE WIND TUNNEL
风洞中投弹运动的三维高速立体摄影测量

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.