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    • 2. 发明申请
    • Combined magnetic field gradient and magnetic field strength sensor
    • 组合磁场梯度和磁场强度传感器
    • US20070096729A1
    • 2007-05-03
    • US10581308
    • 2004-12-16
    • Kevin BrunsonDavid King
    • Kevin BrunsonDavid King
    • G01R33/02
    • G01R33/0286G01R33/022G01R33/0283
    • A magnetic field sensor device (2) is described that comprises an oscillatory member (8) and current control means (6). The current control means (6) is arranged to pass an alternating current (AC) along at least first (10) and second (12) current paths provided through the oscillatory member (8) and is arranged to provide magnetic gradiometer mode operation (i.e. to measure magnetic field gradient) in which current flow through the first current path (10) is in substantially the opposite direction to current flow through the second current path (12). The current control means (6) can also prove magnetometer mode operation (i.e. to measure magnetic field strength). The magnetic field sensor (2) may be used in a compass.
    • 描述了包括振荡构件(8)和电流控制装置(6)的磁场传感器装置(2)。 电流控制装置(6)被布置成沿着穿过振荡构件(8)提供的至少第一(10)和第二(12)电流路径传递交流电(AC),并且被布置成提供磁梯度计模式操作 以测量磁场梯度),其中流过第一电流路径(10)的电流基本上与通过第二电流路径(12)的电流相反。 电流控制装置(6)还可以证明磁力计模式操作(即测量磁场强度)。 磁场传感器(2)可以用于罗盘。
    • 3. 发明申请
    • Micro-electromechanical systems
    • 微机电系统
    • US20050104675A1
    • 2005-05-19
    • US10507113
    • 2003-03-19
    • Kevin BrunsonDavid HamiltonDavid KingMark McNie
    • Kevin BrunsonDavid HamiltonDavid KingMark McNie
    • B81B5/00B81B7/02G01C19/5684H03B5/30
    • G01C19/5684
    • A micro-electromechanical system (MEMS) comprises a substrate incorporating an oscillatory ring, forcing electrodes for driving the ring into resonance, and sensing electrodes providing an electrical output signal dependent on oscillation of the ring as a result of such forcing and any externally applied force. A positive feedback circuit is provided for feeding back a signal dependent on the output signal of the sensing electrodes to the forcing electrodes in order to sustain oscillation of the ring. The use of positive feedback to drive the forcing electrodes in order to sustain oscillation of the ring is highly advantageous in such an application since it produces a system which exhibits very low phase noise of a magnitude considerably less than the phase noise experienced in use of a phase-lock loop circuit to sustain oscillation.
    • 微机电系统(MEMS)包括:包含振荡环的衬底,迫使用于将环驱动到谐振中的电极;以及感测电极,其由于这种强制和任何外力施加的力而提供取决于环的振荡的电输出信号 。 提供正反馈电路,用于将取决于感测电极的输出信号的信号反馈到强制电极,以维持环的振荡。 使用正反馈来驱动强制电极以维持环的振荡在这种应用中是非常有利的,因为它产生的系统显示出非常低的相位噪声,其幅度远远小于使用 锁相环电路来维持振荡。