Electricity: measuring and testing – Magnetic – Magnetometers
Patent
1993-12-15
1996-04-30
O'Shea, Sandra L.
Electricity: measuring and testing
Magnetic
Magnetometers
324128, 324115, 324 72, 324260, 340600, G01R 3302, G01R 2908, G01R 1300
Patent
active
055128238
ABSTRACT:
A hand-held detector for determining whether the exposure to electromagnetic fields resulting from electric power lines, faulty wiring, and electrical and electronic appliances is within acceptable limits. The device includes a shielded pickup coil, a filter circuit having a transfer function which provides a distinct response in two frequency bands, a summing circuit which provides a voltage indicative of the detected levels of electromagnetic flux density in the two frequency bands, and a display circuit, to provide a visual indication of the detected energy level. The filtering circuit preferably includes a first, extremely low frequency (ELF) amplifier having an upper cutoff frequency of approximately 2 kHz, and a second, very low frequency (VLF) amplifier having a lower cutoff at approximately 6 kHz. The display circuit consists of a series of visual indicators, such as light emitting diodes (LEDs), which progress from green to yellow to red in color, in the manner of a traffic signal, to indicate whether the received radiation in both frequency bands is below, at, or above an acceptable level.
REFERENCES:
patent: 2879382 (1959-03-01), Freen
patent: 4198596 (1980-04-01), Waeselynck et al.
patent: 4634969 (1987-01-01), Edlin et al.
patent: 4954812 (1990-09-01), Lebron
patent: 5150051 (1992-09-01), Friedman et al.
patent: 5256960 (1993-10-01), Novini
patent: 5309097 (1994-05-01), Bill et al.
patent: 5311130 (1994-05-01), Bill et al.
"Electromagnetic Field Radiation Monitors", Walker Scientific Inc., Publication (date unknown).
"Build this Field Meter", Reinhard Metz, Radio-Electronics, pp. 33-38, Apr. 1991 (Publication).
GB 02244560, UK Patent Application, Dec. 1991 by Michael Anthony Butler.
User's Handbook for Evaluating Visual Display Units, published by MPR 1990: 10, Dec. 31, 1990.
Test Methods for Visual Display Units, MPR, 1990: 8 section 2.03, Dec. 1, 1990.
Eakes Research, Inc.
O'Shea Sandra L.
Patidar Jay M.
LandOfFree
Electromagnetic field detector for detecting electromagnetic fie does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Electromagnetic field detector for detecting electromagnetic fie, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Electromagnetic field detector for detecting electromagnetic fie will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-631183