Comparisons between current high speed film and video recording

High speed film cameras have been used for observation and measurement in aerodynamic and aeroballistic facilities since these facilities were first introduced. Following an introduction, the paper outlines the basic mechanisms of high speed film and video recording bringing out the differences in the way in which the image is obtained and stored. This is followed by a brief history of the development of both systems. It goes on to describe the various types of video sensor and the way in which the signals obtained are stored, both temporarily and permanently. Mention is made of the way in which video recording has gradually moved into the high speed area. Comparisons are made between film and video in terms of information density and relative resolution and image blur. Short exposure time, still video is described and points made about the transformation of film to video images. A discussion of the special merits of film and video methods follows with comparisons. Finally a short summary is made of what the future may be for both methods of recording.