Slapper detonator flyer microphotography with a multiframe Kerr cell and Cranz-Schardin camera

Olin K. McDaniel III

doi:10.1117/12.24061

1 April 1991 Slapper detonator flyer microphotography with a multiframe Kerr cell and Cranz-Schardin camera

Olin K. McDaniel III

Proceedings Volume 1358, 19th Intl Congress on High-Speed Photography and Photonics; (1991) https://doi.org/10.1117/12.24061
Event: 19th International Congress on High-Speed Photography and Photonics, 1990, Cambridge, United Kingdom

Abstract

Critical to all Exploding Foil Initiator or "slapper" systems is the bridge-barrel--flyer combination, which needs to be optimized for each application and fire set. The best way to do this is with optical diagnostics. Parameters desired are the flyer position, shape, and velocity versus time as a function of charge voltage and discharge current. Multifraine microphotography of a flyer moving down a barrel is one solution but poses several problems, one of which is the insufficient depth of field of the optics system. If most of the length of the "infinite" diameter barrel is removed and the flyer is viewed from the side, then its axis of movement will remain in focus, displacement versus time will be recorded, and its shape inferred. Bridge burst may also be photographed to guarantee against shorting and attain maximum performance. The flyer event takes place in about 80 nsec. , necessitating a 100 million frame per second camera for 8 frames. Kerr cell cameras are seldom used but provide superior spatial resolution to electronic image convertors, are more rugged and much less expensive. Laser microphotography is more conmion. After a review of the principles of Kerr cells, two multiframe Kerr cell cameras will be described. Using a nitrogen laser pumped dye system as backlight, the Kerr cameras may photograph nonluminescent objects. Minus the Kerr cells the multifranie optics and laser may be used in a Cranz - Schardin mode.

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Olin K. McDaniel III "Slapper detonator flyer microphotography with a multiframe Kerr cell and Cranz-Schardin camera", Proc. SPIE 1358, 19th Intl Congress on High-Speed Photography and Photonics, (1 April 1991); https://doi.org/10.1117/12.24061

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KEYWORDS

Cameras

Photography

High speed photography

Camera shutters

Explosives

Nitrogen lasers

Bridges

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