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    • 4. 发明申请
    • AN INTERFERENCE-TOLERANT PROXIMITY SENSOR SYSTEM HAVING A RESONANCE-TRACKING IMPEDANCE ANALYZER
    • 具有谐振跟踪阻抗分析仪的干扰容忍传感器系统
    • WO01024366A1
    • 2001-04-05
    • PCT/US2000/026986
    • 2000-09-29
    • G01B7/00G01B7/02G01D3/06H03K17/95
    • G01D3/06G01B7/003G01B7/023H03K17/9502
    • A system to analyze the impedance of interference-tolerant proximity sensors. A lock-in amplifier (LIA) is implemented as a resonance-tracking oscillator. The control loop of the amplifier monitors the response of sensor in relation to the output of a local oscillator to adjust the oscillator's frequency to resonance. The nature of the sensor acts as a pre-filter of noise for a synchronous demodulator, which demodulates the sensor's response with the local oscillator's driving signal. The output of the system is a filtered version of this demodulated signal. This system is effective in sensing objects in the presence of electromagnetic noise that is many times stronger than the signal produced by the local oscillator.
    • 一种分析干扰容忍接近传感器阻抗的系统。 锁相放大器(LIA)被实现为谐振跟踪振荡器。 放大器的控制环路监测传感器相对于本地振荡器的输出的响应,以将振荡器的频率调整为谐振。 传感器的性质可以用作同步解调器的噪声预滤波器,通过本地振荡器的驱动信号来解调传感器的响应。 该系统的输出是该解调信号的滤波版本。 该系统在存在比由本地振荡器产生的信号强多倍的电磁噪声的情况下有效地感测物体。
    • 8. 发明授权
    • Digital display measuring apparatus
    • 数字显示测量仪
    • US4689890A
    • 1987-09-01
    • US880651
    • 1986-06-30
    • Shingo Nishina
    • Shingo Nishina
    • G01B21/00G01B21/08G01D3/06G01D7/00G01D7/08G01B7/02G02F1/133
    • G01B21/08G01B21/00G01D3/06G01D7/08
    • A digital display measuring apparatus including a movable contact on the body of the measuring apparatus to engage with an object to be measured, an encoder for converting the displacement of the contact into an electrical output signal, a counting circuit for counting the output signal of the encoder, and a digital display for indicating the counted value from the counting circuit. The digital display further includes a measurement indicator unit for indicating the displacement of the contact and a preset indicator unit for indicating a preset value higher than those indicated in the measurement indicator unit. The preset indicator unit includes a presetting device for supplying a reference value to the preset input of the preset indicator unit. With this apparatus even if the object to be measured has a length exceeding the maximum displacement of the contact, the full length of the object may be measured and indicated.
    • 一种数字显示测量装置,包括在测量装置的主体上与可测量物体啮合的可动触点,用于将触点的位移转换为电输出信号的编码器,用于对所述测量装置的输出信号进行计数的计数电路 编码器和用于指示计数电路的计数值的数字显示器。 数字显示还包括用于指示触点的位移的测量指示器单元和用于指示高于测量指示器单元中指示的预设值的预设指示器单元。 预置指示器单元包括用于向预设指示器单元的预设输入提供参考值的预设装置。 即使要测量的物体的长度超过接触件的最大位移,也可以测量和指示物体的全长。