Sensors for Measurement of Intense Electromagnetic Pulses

Fast, large-amplitude pulses are encountered in-the nuclear electromagnetic pulse (EMP), lightning, various pulse-power machinery, and charged particle ke~ms. In the context of the EMP program various accurate, broad-band senrs have been developed. The principal types of these sensors have been ..signedto measure electric and magnetic fields, current densities, currents, and voltages. Often it is the time-derivative waveforms that are measured for good accuracy. These sensors are now being applied to the measurement of the fast-transient electromagnetic properties of lightning. The general design concepts and techniques for such sensors are alSO appliCc?ble in various pulse power ~chines, where one may wish to ~~sUre VariOUS impulsivecurrents and voltages. A more difficult problem occurs when there dW pulsed’particle beams (~ ray, x ray, neutron, electron, etc.) preSeflt. ‘otyever~ Some of the important EMP sensor designs were for nuclear-SourCe‘egion environments,making the concepts generally applicable for such particle-beamenvironments. ‘esid@s th’eactual sensors which convert the desired electromagnetic field ~arameterS’tOvoltage and current at a connector (terminal), OfleMUSt also ccnsid~r tie topology of any conductors (such.as cables) attached to the ‘cns~?, Or”of which the sensor fores a part (such as a shield), in designing expe~~-ti.ts:’; In SOme cases syimnetryis also an important consideration.. ‘ppmv* fir PUblic release; distribution unlimited. . CLEAFiEDFORPUi3LfC RELEASE “ “#ir5c PmJPA, (g 1-210 W-B32