| 摘要 |
<p>A laser-ignitable ignition composition (24, 24a) contains a mixture of explosive material particles and light-absorbing particles wherein the explosive material particles have an average size of less than 4 microns, e.g., an average size of about 1 to 2 microns. The explosive material particles may have a particle size distribution in which about 90 percent of the particles have a diameter less than 2 1/2 times the average particle size. The explosive material particles may be BNCP. The light-absorbing particles may constitute more than about 3 percent by weight of the combined weight of the BNCP and the light-absorbing particles, e.g., about 5 percent by weight. The light-absorbing particles may comprise carbon black. The ignition composition is used in a laser-activated initiator assembly (10) having a casing (10a) having an input end, an output end and a signal train chamber opening to the input end. A header (12) is coupled to the casing to dispose the signal-emitting end of an optical fiber in the chamber. The ignition composition is disposed in the chamber in signal transfer proximity to the signal-emitting end of the optical fiber. The casing (10a) contains an output charge (22) that is sensitive to ignition of the ignition composition.</p> |
