摘要
低照度、低对比下的高速摄影不断增长的需要促进了新型摄影系统的发展,其中在镜头与高速运动胶片之间加入象增强器所构成的微光高速摄影可使摄影的灵敏度有显著的提高。它具有高光增益、高成家质量的优点。同时由于高速电子快门取代了机械快门,使此类摄影系统面目一新。 由于高的光增益,使此摄影系统的信息记录能力大大增加,高速摄影的信息量I为: I=PFn^2[log_2 (1+SN)]g^(2/3)其中g=tp/te ((时间间隔)(曝光时间)) 当采用微光高速电影摄影时,它的信息量Γ为: Γ=PFn′~2[log_2 (1+S/N)](Gg)^(2/3) I′/I=(n′/n)~2G^(2/3) G通常为5×10到10~4倍 本章讨论了微光高速摄影系统中主要器件和主要技术。介绍了国外此摄影系统的发展水平与动向以及我国的应用前景。
The continuous increasing need for high speed photography at low light levels and low contrast has spurred the development of a new camera system. The addition of an image intensifier between the lens and the high speed film forms a low light level high speed cine-camera system. A substantial increase in photographic sensitivety of the system can be achieved. The system with high speed electric shutter instead of mechanical shutter provides high light gain and high image quality. Thus, the photographic system has been taken on an entirely new look.The capacity for recording information in the photographic system has been greatly increased due to high light gain. Information I of high speed photography is:I=PFn2[log2(1 + S/H)]g2/3whereWhen high speed cine photography at low light levels is used, the informationI' of this this system is:G is usually from 5×10 to 104In the paper were discussed the main devices and the main techniques of the system, and introduced the development level and trend for this photographic system in the workl and applied prospects in the China.
关键词
电影摄影
微光高速摄影
象增强器
High speed photography at low light level
Image intensifier
