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    • 4. 发明授权
    • Wireless structural health monitoring system with synchronized timekeeper
    • 具有同步计时器的无线结构健康监测系统
    • US09090339B2
    • 2015-07-28
    • US13196031
    • 2011-08-02
    • Steven W. ArmsChris Pruyn TownsendDavid Lawrence ChurchillMichael John Hamel
    • Steven W. ArmsChris Pruyn TownsendDavid Lawrence ChurchillMichael John Hamel
    • G08B1/08B64C27/00G01M5/00G07C5/08
    • B64C27/006B64C2027/002G01M5/00G07C5/085
    • A method of obtaining data about a structure includes providing a plurality of sensor modules on the structure. Each of the sensor modules includes a sensor, a processor, a sensor module precision timekeeper, and a sensor module transceiver. One of the plurality of sensor modules includes an energy harvesting device. The processor and the sensor module transceiver of this one of the plurality of sensor modules are powered solely with electricity derived from the energy harvesting device. The method further includes providing a base station. The method further includes periodically wirelessly receiving a broadcast resynchronization timing packet with each of the sensor module transceivers, wherein the broadcast resynchronization timing packet received by each of the sensor module transceivers includes a common resynchronization time value. The method further includes periodically resynchronizing each of the sensor module precision timekeepers based on a signal derived from the resynchronization time value. The method further includes digital sampling of the sensor module sensor in each of the sensor modules to provide digital sensor data, and providing a time stamp to the digital sensor data wherein time in the time stamp is provided by the sensor module precision timekeeper. The method further includes wirelessly transmitting data from each of the plurality of sensor modules to the base station, wherein the data is derived from the time stamped digital sensor data. The method further includes receiving and aggregating the data from each of the plurality of sensor modules in the base station.
    • 获得关于结构的数据的方法包括在该结构上提供多个传感器模块。 每个传感器模块包括传感器,处理器,传感器模块精密计时器和传感器模块收发器。 多个传感器模块中的一个包括能量收集装置。 多个传感器模块中的该一个传感器模块的处理器和传感器模块收发器仅由来自能量收集装置的电力供电。 该方法还包括提供基站。 该方法还包括周期性地与传感器模块收发器中的每一个无线地接收广播再同步定时分组,其中由每个传感器模块收发机接收的广播再同步定时分组包括公共重新同步时间值。 该方法还包括基于从再同步时间值导出的信号周期性地重新同步每个传感器模块精确计时器。 该方法还包括在每个传感器模块中的传感器模块传感器的数字采样,以提供数字传感器数据,并为数字传感器数据提供时间戳,其中时间戳中的时间由传感器模块精密计时器提供。 该方法还包括将数据从多个传感器模块中的每一个无线传输到基站,其中数据从时间戳的数字传感器数据导出。 该方法还包括从基站中的多个传感器模块中的每一个接收和聚合数据。
    • 10. 发明授权
    • Micropower differential sensor measurement
    • 微功率差动传感器测量
    • US06714763B2
    • 2004-03-30
    • US10215752
    • 2002-08-09
    • Michael John HamelChristopher P. TownsendSteven W. Arms
    • Michael John HamelChristopher P. TownsendSteven W. Arms
    • H04B500
    • G06K19/0701G06K19/0723
    • A sensing device includes a Wheatstone bridge and a source of a stimulation configured to apply the stimulation across two electrodes of the Wheatstone bridge. The device also includes a timing sensitive circuit configured to detect timing of a signal appearing across one of the other electrodes of the bridge as a result of the stimulation being applied. The timing provides a way to read the sensor. The device can be powered remotely and data so read can be transmitted using the remote power. The timing sensitive circuit includes a comparator. The comparator provides a high logic signal for a time related to the reactance of one leg of the Wheatstone bridge, and that provides a reading of a differential sensor having elements in each leg of the bridge.
    • 感测装置包括惠斯通电桥和被配置为在惠斯通电桥的两个电极上施加刺激的刺激源。 该装置还包括定时敏感电路,其被配置为作为施加刺激的结果来检测出现在桥的另一个电极之间的信号的定时。 时序提供了读取传感器的方法。 该设备可以远程供电,并且可以使用远程电源传输所读取的数据。 时序敏感电路包括比较器。 该比较器提供了一个与逻辑信号相关的时间,与惠斯通电桥的一条电抗相关,并提供了一个差分传感器的读数,该差分传感器在桥的每条支路中都有元件。