Electrical and Thermal Considerations in the Design of Electroexplosive Devices.

摘要

Electrical and thermal considerations in the design of electroexplosive devices are discussed, with emphasis on means of complying with the '1 amp, 1 w, no-fire' requirement of many recent standards and specifications, yet retaining sufficient pulse-energy sensitivity to be fired by guided missile fuze circuitry in current use. Included are discussions of the implications of the general, lumped parameter electro- thermal equation for input characteristics of initiators, the analogy of electrical and thermal conductivity, and the control of gross heating of initiators. A set of units for convenient computation of thermal properties of initiators is proposed, Conversion formulas are given, and values for frequently used materials are tabulated in the suggested units. Equations are derived for the design of bridgewires of various length/diameter ratios and film bridges. Effects of plug and terminal materials and design, and the choice of explosive are discussed. It is possible, by the choice of materials, dimensions, and configuration, for the designer to predetermine energy, current, and power sensitivity independently over a wide range of values.