Proceedings of the Sixteenth Symposium on Explosives and Pyrotechnics, Essington, PA, April 1997.

Bridgewire Heating

Barry T. Neyer
EG&G Optoelectronics/Star City
Miamisburg, OH 45343-0529

Contact Address
Barry T. Neyer
PerkinElmer Optoelectronics
1100 Vanguard Blvd
Miamisburg, OH 45342
(937) 865-5586
(937) 865-5170 (Fax)


Electric currents are applied to an electro-explosive device for several reasons. One is to function the device. Another reason would be to check the electrical resistance of the circuit to ensure that the device will work as expected. When checking the resistance, it is important to ensure that the device does not function, and that it does not degrade. Thus, it is desirable to know the current-induced temperature rise in the bridgewire.

This report will describe calculations to compute the temperature rise. It uses a simplified physical model that nevertheless gives a good match to the physics of the device. Using this model, it is possible to construct an exact solution to the physical problem. This report will give the derivation, and show the temperature rise as a function of position along the bridgewire and the time. The temperature information will allow the design engineers to determine the allowable current to use when performing continuity tests, as well as to estimate the effects of various RF induced currents on the temperature of the device.

Technical Papers of Dr. Barry T. Neyer

Down Load Paper and Figures (94KB)