公开(公告)号：US07634387B2

公开(公告)日：2009-12-15

申请号：US11461902

申请日：2006-08-02

申请人： Cary R. Murphy ,  Daniel M. Goertzen ,  Mark K. Bridges ,  David E. Vokey

发明人： Cary R. Murphy ,  Daniel M. Goertzen ,  Mark K. Bridges ,  David E. Vokey

IPC分类号： G06F11/30

CPC分类号： H04B10/00

摘要： A signal which varies over time is monitored to determine an alarm condition, where the sample stream of digital values from an A/D converter is divided in to equal length pieces and a Fourier Transform (FT) algorithm is used to transform each piece of the stream into a three dimensional dataset including frequency domain amplitude, frequency and time. A Frequency Envelope is calculated by taking the maxima over the time dimension for a period of time, leaving a two dimensional frequency domain amplitude vs frequency dataset which is compared with new data arriving to determine the alarm condition for each element of the Frequency Envelope either by applying a constant delta additively or multiplicatively or by using a “leaky bucket” algorithm.

摘要翻译： 监视随时间变化的信号以确定警报状况，其中来自A / D转换器的数字值的采样流被划分成相等的长度，并且使用傅里叶变换（FT）算法来变换每个 流入包括频域幅度，频率和时间的三维数据集。 通过在时间维度上取最大值来计算频率包络，留下二维频域振幅对频率数据集，与新数据比较，以确定频率包络的每个元素的报警条件，由 应用一个常量增量加乘法或通过使用“泄漏桶”算法。

公开(公告)号：US07706641B2

公开(公告)日：2010-04-27

申请号：US11461917

申请日：2006-08-02

申请人： Cary R. Murphy ,  Mark K. Bridges ,  Joseph Giovanni ,  David E. Vokey ,  Daniel M. Goertzen

发明人： Cary R. Murphy ,  Mark K. Bridges ,  Joseph Giovanni ,  David E. Vokey ,  Daniel M. Goertzen

IPC分类号： G02B6/00

CPC分类号： H04B10/85

摘要： Some or all of the optical fibers of a single-mode or multi-mode cable are monitored for intrusion by transmitting through the fibers a signal which can be analyzed for changes in its characteristics which are indicative of movement as a prelude to an intrusion event. To avoid independent monitors of all of the fibers, in some cases the same light signal is looped through a plurality of the fibers in series by passive jumpers. Switches can be used to disconnect out those fibers which are compromised. As an alternative a plurality of separate monitoring signals can be provided each associated with its own sensor where unique combinations of the signals are transmitted through separate fibers allowing a higher number of fibers to be monitored than the number of signals.

摘要翻译： 监测单模或多模光缆的部分或全部光纤通过光纤传输一个信号，该信号可以分析其特性的变化，这些变化表示作为入侵事件的前奏的移动。 为了避免所有光纤的独立监视器，在某些情况下，相同的光信号通过被动跳线串联的多根光纤环绕。 开关可用于断开那些被损坏的纤维。 作为替代，可以提供多个单独的监视信号，每个独立的监视信号与其自己的传感器相关联，其中信号的独特组合通过分开的光纤传输，允许监视比信号数量更多的光纤。