Environmental indicator device and method
    36.
    发明授权
    Environmental indicator device and method 失效
    环境指标装置及方法

    公开(公告)号:US4646066A

    公开(公告)日:1987-02-24

    申请号:US749326

    申请日:1985-06-27

    CPC classification number: G08B21/182 G01D5/12 G01D5/48 G01N27/122

    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.

    Abstract translation: 用于监测环境暴露的装置包括响应于环境暴露以预定方式改变电特性的元件。 元件可以是调谐电路或调谐电路的屏蔽的一部分。 在任一种情况下,当调谐电路被询问时,优选地通过r.f. 或微波信号,它发出强度取决于元件的电性能的信号。 因此,增量环境暴露可以通过信号强度的变化来测量。 该设备对于监测易腐物质的状况特别有用,因为它可以在储存和询问期间与包装材料内容易变质。

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