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[var.doi;ope=max:15000;onformat=makelink;htmlconv=no]

High speed camera: Lighter

A high speed camera is a device used for recording slow-motion playback films, or used for scientific study of transient phenomena.

http://en.wikipedia.org/wiki/High_speed_camera 

A normal motion picture is filmed and played back at 24 frames per second, while television uses 25 frames/s (PAL) to 29.97 frames/s (NTSC). High speed cameras can film up to 250,000 frames/s by running the film over a rotating prism or mirror instead of using a shutter, thus reducing the need for moving parts. Using this technique one can stretch one second to more than 10 minutes of playback time (super slow motion). The fastest cameras are generally in use in scientific research, military test and evaluation, and industry. An example of an industrial application is crash testing to better document the crash and what happens to the automobile and passengers during a crash. MythBusters often use high speed cameras to see their test in slow motion.

A problem for high speed cameras is the needed exposure for the film, so one needs very bright light to be able to film at 40,000 frame/s sometimes leading to the subject of examination being destroyed because of the heat of the lighting.

Even higher speed imaging is possible using specialized electronic charge-coupled device (CCD) imaging systems which can achieve speeds of up to or in excess of 25 million frames per second.

Recent advances in the form of image converter devices are able to provide temporal resolutions of less than 50 picoseconds, equivalent to over 20,000,000,000 frames per second. These instruments operate by converting the incident light (consisting of photons) into a stream of electrons which are then deflected onto a photoanode, back into photons, which can then be recorded onto either film or CCD.

 
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Keywords
Slowmotion  high  speed  camera  
 
 About This Video
 
 Subject Laboratory Equipment
 Category Patents and Inventions
 Duration 00:00:24
 Views 2555
 Added 27-12-07
 Contributor    matlabuser
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