Thermal Response of Bridgewires used in Electroexplosive Devices

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Abstract
The thermal equations for a bridgewire or equivalent electroexplosive device are presented. When sinusoidal current passes through such a thermally sensitive resistance, it is capable of generating a third harmonic voltage which is a measure of the ability to follow the instantaneous cycling power fluctuations. By measuring the variation of this third harmonic with frequency it is possible to determine the thermal time constant.

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