DEVELOPMENT OF A HIGH-CURRENT PROBE.
Technical rept. Jul 67-Apr 68,
ADVANCED KINETICS INC COSTA MESA CALIF
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The program was aimed at the development of wideband probes for the detection of transient currents ranging up to 300,000 amperes generated during the discharge of the AFSWC Kirtland EMP installation. The method adopted for the measurement is based on electromagnetic induction between the magnetic field of the current-carrying conductor and a toroidally wound loop. The theoretical foundations of the method are first examined in general terms. Subsequently, the response is calculated for probes and conductors of arbitrary cross sections by evaluating the surface integrals. Detailed calculations of the response are also carried out for the conductors to be used in the Kirtland EMP installation. The probe is discussed as a part of the complete detecting circuitry. A detailed analysis is presented of the equivalent circuit describing accurately the problems of attenuation, of output impedance, and of passive integration. The results of these analytical studies are used for the engineering design of three probes, each of these being aimed at covering a definite range in current and frequency response. The mechanical design of the probes satisfies these response parameters, the requirement for opening the loop around the conductor and the need for adequate shielding to minimize RFI effects. The response of the probes is studied by using signal generator and high-power pulse testing methods. The results are presented in terms of formulae and descriptive graphs. Author
- Test Facilities, Equipment and Methods