H - Electricity – 01 – H
Patent
H - Electricity
01
H
324/48, 340/135.
H01H 36/00 (2006.01) G01R 33/07 (2006.01) G01V 3/08 (2006.01) G08B 21/00 (2006.01)
Patent
CA 1308167
A MAGNETIC FIELD ALARM INDICATOR ABSTRACT OF THE DISCLOSURE A magnetic field alarm indicator comprised of a plurality of magnetic field detectors mounted in a horizontal plane for detecting respective rotational components of a magnetic field and in response generating respective signals proportional thereto. Each of the detectors is mounted at a predetermined angle with respect to adjacent ones of the detectors, thereby encompassing a 360-degree field of view. Circuitry is included for rectifying and summing the respective signals received from the detectors and in response generating an output signal. Additional circuitry is provided for comparing the output signal to a predetermined set-point signal and in the event the output signal is greater than the set-point signal generating one or both of an audible and visual alarm signal. The alarm indicator of the present invention is particularly useful for measuring high magnetic field strengths in the vicinity of magnetic resonance imaging systems for preventing accidental malfunctioning of sensitive medical equipment such as infusion pumps, ventilators, etc., and protecting magnetically sensitive components such as magnetic tapes, credit cards etc.
581126
London Health Sciences Centre
Sim & Mcburney
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