Explosion Of Copper Wires Research Articles

Flash radiography using exploding wire technique.

By exploding a thin tungsten wire in vacuum, it is found that an ultrafast (20 nsec half-width), reproducible x-ray pulse is emitted from the wire during the first half-cycle of the discharge. The half-width of the pulse seems to be independent of the ringing frequency of the discharge circuit. It is shown that it is possible to use the exploding wire as a flash x-ray source for taking radiographs of high speed events, e.g., an exploding copper wire.

Expansion of the luminescence zone in the electrical explosion of thick wires

This paper gives the results of experimental studies of the expansion of the luminescence zone associated with the electrical explosion of copper wires 0.74 mm in diameter and 20 cm long. It is demonstrated that the time dependence of the diameter of the luminescence zone coincides with the law of motion of a self-similar cylindrical shock wave. The energy of hydrydynamic motion has been determined for different energies introduced into the metal. The fraction of vaporized wire is estimated.

171. The spectrum of exploding copper wires at different pressures: K. Copala Krishnan, et al., J. Sci. Industr. Res.21B (6), June 1962, 272

171. The spectrum of exploding copper wires at different pressures: K. Copala Krishnan, et al., J. Sci. Industr. Res.21B (6), June 1962, 272

X-Ray Diffraction Analysis of Aerosols from Exploding Wires

AbstractIn this study, X-ray diffraction analysis is used to investigate the composition of aerosols produced by exploding wires with the current surge from a 4000-joule capacitor. Qualitative analyses of aerosols from 15 different metals exploded in air or inert atmosphere indicate that the particles are crystalline with the normal crystal structure and that explosion of noble metals in air and of base metals in argon produces aerosols consisting of metallic particles. Base metals exploded in air produce aerosols consisting primarily of oxides. Nitrides were not observed. An analytical scheme is described for the Cu-Cu2O-CuO mixtures collected on membrane filters from explosions of copper wires in air. The composition of aerosols is determined for various initial voltages (2-18 kv) on the 20-μf capacitor bank for two series of wires. In one, the weight fraction of CuO increases rapidly with voltage until it accounts for almost the entire sample while the Cu2O and Cu content decrease smoothly. In the other, CuO and Cu2O are about equal for explosions above 6 kv while Cu decreases. Differences are attributed to a change in the circuit and mass of wire used.

The use of exploding wires as a light source of very high intensity and short duration.

The flash of light observed in discharging large condensers through a very thin wire has been used as a light source for obtaining photographs and for making visual studies of rapidly moving objects. Copper wire was found most suitable for photographic exposures. Wires made of silver and Chromel gave good results in visual work. The energy emitted by an exploding copper wire was determined by a photographic photometric reduction in four regions of the spectrum. The entire emission of a copper wire of 2.5-cm length amounts to (6.5±0.3)×108 watt/cm2. Its emission in the visible region of the spectrum amounts to 9.6×108 candle power/cm2. The values show the great amount of energy available for this type of work and point to future use.An example is given of the application of exploding wires in an industrial technique, showing the formation of soap granules in the spray drying process. Arrangements for multiple flashes and means of exploding materials not available as thin wires are discussed.