Pulse Generator Based on High Shock Demagnetization of Ferromagnetic Material

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Abstract
The shock wave from a pellet of high explosive is passed without attenuation through one leg of a closed ferromagnetic core which has been previously magnetized. The shock wave demagnetizes the core, reducing the flux from the remanent value to zero. This change in flux generates a voltage in any winding wound on the core. Idealized calculations indicate that the voltage pulse generated in this manner will be a squarewave with amplitude, in volts, given by eg = NBRvw, and a pulse width, in seconds, given by T = s/v, where N is the number of turns, BR the remanent magnetization (webers/m2) and v is the shock velocity (m/sec). It is also assumed that the core has a rectangular cross section, w being the width of the core (m) in the direction perpendicular to BR and v, and s being the thickness of the core (m) in the direction parallel to v. Experimental tests have produced output pulses with an amplitude of 6400 v/turn-meter of w where the length of the pulse was in fair agreement with the known shock velocity of the material used. At the present time it is believed that the operation of the device can be explained by a transducer mechanism which converts some of the energy of the shock wave into electrical energy.

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