Monitoring process and device of a quasi-closed electromagnetic

Details Monitoring process and device of a quasi-closed electromagnetic Monitoring process and device of a quasi-closed electromagnetic

1989-08-01

1991-11-26

Wieder, Kenneth A.

Electricity: measuring and testing

Impedance, admittance or other quantities representative of...

Parameter related to the reproduction or fidelity of a...

324616, 324603, 375 1, G01R 3102

Patent

active

050686160

ABSTRACT:
An emitter assembly of low-power electromagnetic signals with random or pseudo-random frequency variation is located inside an electromagnetic shield to be monitored. These signals are detected by at least one synchronous detection receiver located outside the shield, a second transmission channel, preferably constituted by an optic fiber, connecting the emitter and receiver assemblies to enable synchronous detection of signals transmitted via an electromagnetic channel through the shield. The amplitude of the electromagnetic signals received by the detector is significant of the quality of the shielding.

REFERENCES:
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patent: 4335463 (1982-06-01), Foucard
patent: 4759034 (1988-07-01), Nagazumi
patent: 4962358 (1990-10-01), Svetanoff
patent: 4973911 (1990-11-01), Marshall
Electro Conf. Record "EMI Testing of Metalized Plastics", 8079 vol. 4 (1979-04-24/26) by Robert D. Goldblum, pp. 1-7.
8049 IEE Proceedings Sections A a I "Optically Coupled Probe for Microwave Near-Field Measurements", by Rousseau et al., pp. 74-78 (1984).
IEEE Antennas & Propagation Society Newsletter, "Photonic Sensors for Electromagnetic Field Measurements", by Wyss, pp. 1-43, (1984).
1986 IEEE International Symposium on Electromagnetic Compatibility, "Measurement of Seam Impedances of Tactical Shelters for Threat Level Nemp Simulation", by Papazian et al., pp. 416-422.

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