Communications: electrical – Condition responsive indicating system – Specific condition
Patent
1985-06-27
1987-02-24
Swann, III, Glen R.
Communications: electrical
Condition responsive indicating system
Specific condition
340584, 340588, 340590, 340600, 340603, 340632, 340665, 340689, 73 52, 733365, 324 711, G08B 1318, G08B 2100
Patent
active
046460667
ABSTRACT:
A device for monitoring environmental exposure includes an element whose electrical properties change, in a predetermined way, in response to the environmental exposure. The element may be part of a tuned circuit or of a shield for a tuned circuit. In either case, when the tuned circuit is interrogated, preferably by an r.f. or microwave signal, it emits a signal whose intensity depends on the electrical properties of the element. Thus, an incremental environmental exposure can be measured by a change in the signal intensity. The device is particularly useful for monitoring the condition of perishable materials, because it can be located with the perishable inside a packaging material during both storage and interrogation.
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Baughman Ray H.
Eckhardt Helmut
Elsenbaumer Ronald L.
Iqbal Zafar
Miller Granville G.
Allied Corporation
Riesenfeld James
Swann III Glen R.
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