发明名称 |
Environmental indicator device and method. |
摘要 |
<p>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.</p> |
申请公布号 |
EP0276335(A1) |
申请公布日期 |
1988.08.03 |
申请号 |
EP19870100985 |
申请日期 |
1987.01.24 |
申请人 |
ALLIED CORPORATION |
发明人 |
BAUGHMAN, RAY HENRY;IGBAL, ZAFER;ELSENBAUMER, RONALD LEE;MILLER, GRANVILLE GUY;ECKHARDT, HELMUT |
分类号 |
G01D5/12;G01D5/48;G01K3/04;G01N27/12;G08B21/18;(IPC1-7):G01D5/243 |
主分类号 |
G01D5/12 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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