Communications: electrical – Condition responsive indicating system – Specific condition
Patent
1993-10-12
1994-12-13
Swann, Glen
Communications: electrical
Condition responsive indicating system
Specific condition
2503361, 250395, 250526, G05B 2100
Patent
active
053732855
ABSTRACT:
A personal electromagnetic radiation monitor includes an electromagnetic radiation sensor in the form of at least one coil mounted on a rectangular form of lossy material. A first metal shield plate is situated adjacent to one side of the form on which the coil is mounted, and a second metal shield plate is situated on another side of the form. The metal shield plates have an impedance which varies substantially inversely proportional with the frequency of electromagnetic radiation sensed by the coil, and compensate for the variation in the magnitude of the induced current in the coil, which induced current, without at least one of the shields, would have varied in magnitude substantially directly proportional with the frequency of the electric field component of the electromagnetic radiation, so that the magnitude of an output signal generated by the sensor is relatively independent of the frequency of the sensed electromagnetic radiation.
REFERENCES:
patent: 4301367 (1981-11-01), Hsu
patent: 4368472 (1983-01-01), Gandhi
patent: 4489315 (1984-12-01), Falk et al.
patent: 4605905 (1986-08-01), Aslan
patent: 5168265 (1992-12-01), Aslan
Swann Glen
The Narda Microwave Corp.
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