Electricity: measuring and testing – Impedance – admittance or other quantities representative of... – Parameter related to the reproduction or fidelity of a...
Patent
1995-11-02
1998-10-27
Regan, Maura K.
Electricity: measuring and testing
Impedance, admittance or other quantities representative of...
Parameter related to the reproduction or fidelity of a...
324639, 174 35MS, G01R 3100
Patent
active
058282203
ABSTRACT:
A system and method for continuously monitoring the shielding effectiveness f an electromagnetically shielded enclosure is disclosed including an RF transmitter positioned remote from the shielded enclosure. RF signals emitted from the remotely positioned transmitter are received by both an enclosure receiver positioned inside of the enclosure and simultaneously by a reference receiver having its antenna positioned outside of the shielded enclosure. These two received signals are mixed so as to produce IF signals which are subsequently forwarded to a synchronous detector which determines the ratio of the two signal levels by comparing their strengths. This ratio is indicative of the enclosure's electromagnetic shielding effectiveness. If the effectiveness drops below a predetermined or threshold limit, such is determined by a comparator positioned within the enclosure and an alarm may be sounded so as to indicate that the shield is failing. Accordingly, the effectiveness of the electromagnetic shield may be monitored twenty-four hours a day. It is also noted that the remotely positioned transmitter may be that of an existing radio station according to certain embodiments of this invention.
REFERENCES:
patent: 3492568 (1970-01-01), Johnson
patent: 4789829 (1988-12-01), Stribling
patent: 4962358 (1990-10-01), Svetanoff
patent: 5061899 (1991-10-01), Kudo
patent: 5068616 (1991-11-01), Broyde et al.
patent: 5153524 (1992-10-01), McCormack
patent: 5285164 (1994-02-01), Wong
patent: 5311116 (1994-05-01), Rogers
patent: 5414366 (1995-05-01), Rogers
Carney Thomas Lee
McInerney Michael Kent
Marsh Luther A.
Regan Maura K.
The United States of America as represented by the Secretary of
LandOfFree
Method and system utilizing radio frequency for testing the elec does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Method and system utilizing radio frequency for testing the elec, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Method and system utilizing radio frequency for testing the elec will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1616150