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17 条记录 (耗时 0.028 秒)

    Low power fluxgate circuit with current balance
    7.
    发明授权
    Low power fluxgate circuit with current balance 有权
    具有电流平衡的低功率磁通门电路

    公开(公告)号：US06218831B1

    公开(公告)日：2001-04-17

    申请号：US09314322

    申请日：1999-05-19

    申请人： J. Thomas Fowler

    发明人： J. Thomas Fowler

    IPC分类号： G01R3304

    CPC分类号： G01R33/04 ,  G01C17/28

    摘要： The present invention is a system for cyclically driving an electrical current through at least one non-linear (i.e., saturable) inductor in alternating directions so as to produce a substantially periodic current waveform, and for producing an output signal representative of the current waveform. The system includes at least one capacitive node electrically coupled between a voltage source and a system ground, for storing electrical energy provided by the voltages source. The energy stored within the system is transferred as electrical current in alternating directions through the inductor via a switching network and a controller for configuring the switching network. The controller allows current to flow in each direction until the inductor saturates. The system further includes a signal processor that determines a first time interval and a second time interval related to the amount of time that the current flows through the inductor in a first direction and a second direction, respectively, and produces an output signal that is a predetermined function of the first time interval and the second time interval. The system requires a small amount of input current compared to similar prior art circuits because the inductor current is re-circulated within the system, and input current from an external source is only necessary to replace losses such as I2R dissipation.

    摘要翻译： 本发明是一种用于在交替方向上循环地驱动电流通过至少一个非线性（即可饱和）电感器的系统，以便产生基本上周期性的电流波形，并用于产生表示电流波形的输出信号。 该系统包括电耦合在电压源和系统接地之间的至少一个电容性节点，用于存储由电压源提供的电能。 存储在系统内的能量通过交换网络和用于配置交换网络的控制器通过电感器沿交替方向传递为电流。 控制器允许电流在每个方向流动，直到电感饱和。 该系统还包括信号处理器，其分别确定第一时间间隔和与电流在第一方向和第二方向上流过电感器的时间量相关的第二时间间隔，并且产生作为 第一时间间隔和第二时间间隔的预定功能。 与类似的现有技术电路相比，该系统需要少量的输入电流，因为电感器电流在系统内重新循环，并且来自外部源的输入电流仅需要代替诸如I2R耗散的损耗。

    Method for detecting anomalies in pipes
    8.
    发明授权
    Method for detecting anomalies in pipes 失效
    检测管道异常的方法

    公开(公告)号：US5479100A

    公开(公告)日：1995-12-26

    申请号：US241031

    申请日：1994-05-10

    申请人： J. Thomas Fowler ,  Steven S. Carroll

    发明人： J. Thomas Fowler ,  Steven S. Carroll

    IPC分类号： G01N27/82 ,  G01N27/83 ,  G01R33/00 ,  G01N27/72 ,  G01R33/12

    CPC分类号： G01N27/83 ,  G01N27/82

    摘要： An apparatus and method for detecting anomalies in ferrous pipe structures is presented. An electrical current is passed through the ferrous pipe structure so as to create a magnetic field in the pipe. A sensor having one or more sensor shoe members is placed in the interior of a ferrous pipe structure to be inspected. Each sensor shoe member has one or more magnetometer elements for detecting the magnetic fields in the region of the ferrous pipe structure adjacent to which the sensor shoe member is placed.

    摘要翻译： 提出了一种检测铁管结构异常的装置和方法。 电流通过铁管结构，以在管道中产生磁场。 具有一个或多个传感器靴部件的传感器被放置在要检查的铁管结构的内部。 每个传感器靴构件具有一个或多个磁力计元件，用于检测邻近传感器靴部件的铁系结构区域中的磁场。

    Device and system for indicating rapid deceleration in vehicles
    9.
    发明授权
    Device and system for indicating rapid deceleration in vehicles 失效
    用于指示车辆快速减速的装置和系统

    公开(公告)号：US06911905B2

    公开(公告)日：2005-06-28

    申请号：US10188338

    申请日：2002-07-02

    申请人： Craig D. Carlson ,  J. Thomas Fowler

    发明人： Craig D. Carlson ,  J. Thomas Fowler

    IPC分类号： B60Q1/44 ,  B60Q1/50

    CPC分类号： B60Q1/445

    摘要： A device and system for indicating rapid deceleration to warn the operator and/or others of an urgent deceleration condition is provided. The device includes one or more sensors that are responsive to acceleration in the primary direction of vehicle motion. The controller communicates with the one or more sensors, corrects for gravitational effects, and initiates at least one warning indicator when the sensed acceleration exceeds a threshold value and thereby indicates an urgent deceleration condition.

    摘要翻译： 提供一种用于指示快速减速以警告操作者和/或其他紧急减速条件的装置和系统。 该装置包括响应于车辆运动的主要方向上的加速度的一个或多个传感器。 控制器与一个或多个传感器通信，对重力作用进行校正，并且当感测到的加速度超过阈值时启动至少一个警告指示器，从而指示紧急减速条件。

    Position encoder utilizing fluxgate sensors
    10.
    发明授权
    Position encoder utilizing fluxgate sensors 有权
    位置编码器利用磁通门传感器

    公开(公告)号：US06265867B1

    公开(公告)日：2001-07-24

    申请号：US09315205

    申请日：1999-05-19

    申请人： J. Thomas Fowler

    发明人： J. Thomas Fowler

    IPC分类号： G01B730

    CPC分类号： G01R33/04 ,  G01D5/2216 ,  G01P3/487

    摘要： An improved position encoder system for providing an output signal representative of the position of a movable body, relative to a reference position, includes at least one magnetic element fixedly attached to the movable body. The system further includes a first spatially orthogonal fluxgate sensor pair and a second spatially orthogonal fluxgate sensor pair for detecting the magnetic field. The first sensor pair is disposed adjacent to the polar axis at a first predetermined distance, and the second pair is disposed adjacent to the polar axis at a second predetermined distance, preferably twice the first predetermined distance. The system further includes a signal processor for receiving a signal from the first sensor pair and a signal from the second sensor pair. The signal processor produces an output signal that corresponds to a predetermined combination of the signal from the first sensor pair and the signal from the second pair, such that a resulting relationship between the output signal and the position of the movable body is substantially linear. Motion of the movable body may be rotational or linear, such that the encoded position is angular or linear. Proper placement of the sensors along the magnetic element of a linear position encoder enables a range of motion significantly beyond the total length of the magnetic element. Eccentric placement of the magnetic element on a rotatably movable body provides a substantially linear position-to-output signal relationship with relatively little processing of the resulting sensor signals.

    摘要翻译： 用于提供表示可移动体相对于参考位置的位置的输出信号的改进的位置编码器系统包括固定地附接到可移动体的至少一个磁性元件。 该系统还包括用于检测磁场的第一空间正交磁通门传感器对和第二空间正交磁通门传感器对。 第一传感器对以第一预定距离与极轴相邻地设置，并且第二对以第二预定距离，优选地是第二预定距离的两倍设置在极轴附近。 该系统还包括用于从第一传感器对接收信号的信号处理器和来自第二传感器对的信号。 信号处理器产生对应于来自第一传感器对的信号和来自第二对的信号的预定组合的输出信号，使得输出信号和可移动体的位置之间的所得关系基本上是线性的。 可移动体的运动可以是旋转的或线性的，使得编码位置是角度的或线性的。 传感器沿着线性位置编码器的磁性元件的正确放置能使运动范围明显超过磁性元件的总长度。 磁性元件偏心放置在可旋转移动的主体上，在相对较少的所得到的传感器信号的处理上提供基本线性的位置到输出信号关系。