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    • 21. 发明授权
    • Buried object locator system employing automated virtual depth event detection and signaling
    • 使用自动化虚拟深度事件检测和信令的埋地对象定位系统
    • US08248056B1
    • 2012-08-21
    • US12263289
    • 2008-10-31
    • Mark S. OlssonMichael J. MartinPaul G. Stuart
    • Mark S. OlssonMichael J. MartinPaul G. Stuart
    • G01R19/00G01V3/12
    • G01R29/0871G01R29/0878G01V3/15
    • A human-portable utility locator system for locating and tracing a buried utility line characterized by an electromagnetic field emission. The locator may include a horizontal spaced sensor pair for detecting the horizontal field asymmetry of the emitted field in one or more independent frequency bands, which is employed to assist in determining an accurate “virtual depth” measurement for producing detection events. An event detector may be disposed to detect events corresponding to extremum in the B-field gradient with respect to time and a user interface (UI) coupled to the event detector signals the detected event to a user. In a preferred embodiment, one pair of spaced-apart 3D magnetic sensor arrays is disposed substantially orthogonal to another intermediate spaced-apart pair of sensors.
    • 一种人造便携式实用定位系统,用于定位和跟踪以电磁场发射为特征的埋地公用事业线。 定位器可以包括用于检测一个或多个独立频带中的发射场的水平场不对称性的水平间隔传感器对,其用于帮助确定用于产生检测事件的精确“虚拟深度”测量。 可以设置事件检测器以相对于时间检测对应于B场梯度中的极值的事件,并且耦合到事件检测器的用户界面(UI)将检测到的事件发信号给用户。 在优选实施例中,一对间隔开的3D磁传感器阵列基本上与另一中间间隔开的传感器对正交设置。