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    • 4. 发明申请
    • ELECTRONIC TAMPER EVIDENT SEAL
    • 电子夯实剂密封件
    • WO2007059161A1
    • 2007-05-24
    • PCT/US2006/044248
    • 2006-11-13
    • E.J. BROOKS COMPANY
    • EHRENSVARD, JakobEINBERG, FredrikDEBRODY, Robert F.DREISBACH, RichardLUNDBERG, George
    • G08B13/14
    • G08B13/1445G09F3/0329G09F3/0352G09F3/0358Y10T292/48
    • Disclosed is a reusable locking unit and a one time use electrically conductive molded thermoplastic shackle loaded with carbon black particles and having a linear resistance that is periodically monitored. The locking unit includes an integrated circuit for measuring shackle impedance through terminals capacitively coupled to the shackle. The terminals allow for adjustment of the length of the seal shackle in the locked secured state. The terminals and shackle form an RC network having a complex impedance that manifests the locked adjusted shackle length. Two AC signals at two different frequencies are used to measure impedance, which is compared with an initially determined or continually generated reference impedance to determine a tampered state of the shackle. Temperature compensation is also disclosed. A time stamp is stored for noting the tampering time of occurrence. A battery may be used to operate the circuit internal components and power from the remote transceiver may operate the circuit communication portion. Monitoring may be automatically periodic or activated only upon an external command. LEDs provide visual indication of the seal tam er status.
    • 公开了一种可重复使用的锁定单元和一次性使用的导电模制热塑性卸扣,其装载有炭黑颗粒并具有周期性监测的线性电阻。 锁定单元包括集成电路,用于通过电容耦合到钩环的端子来测量钩环阻抗。 端子允许在锁定的固定状态下调节密封钩环的长度。 端子和钩环形成具有复阻抗的RC网络,其表现出锁定的调整的钩环长度。 使用两个不同频率的两个AC信号来测量阻抗,其与初始确定的或连续产生的参考阻抗进行比较以确定卸扣的篡改状态。 还公开了温度补偿。 存储时间戳记,注意发生的篡改时间。 可以使用电池来操作电路内部组件,并且远程收发器的电力可以操作电路通信部分。 只有外部命令才能自动定期或激活监控。 LED可以提供密封件状态的可视指示。