出典:Wikipedia
出典:『Wikipedia』 (2011/05/16 23:11 UTC 版)
An explosive lens—as used, for example, in nuclear weapons—is a highly specialized explosive charge, a special type of a shaped charge. In general, it is a device composed of several explosive charges that are shaped in such a way as to change the shape of the detonation wave passing through it; conceptually similar to the effect of an optical lens on light. The explosive charges that make it up have different rates of detonation, just as an optical lens is composed of media having different effect on the velocities of light passing though them. To convert spherically expanding wavefront into spherically converging by single boundary between fast and slow explosives, the boundary shape must be a hyperboloid; to convert spherically diverging front into the flat one - paraboloid, and so on. Several boundaries can be used to reduce aberrations (deviations from intended shape) of the final wavefront.