Steam turbine blade arrival time processor with automatic gain control
    1.
    发明授权
    Steam turbine blade arrival time processor with automatic gain control 失效
    汽轮机叶片到达时间处理器具有自动增益控制

    公开(公告)号:US5015949A

    公开(公告)日:1991-05-14

    申请号:US288592

    申请日:1988-12-22

    IPC分类号: G01H11/00 G01H1/00 G01H11/02

    CPC分类号: G01H1/006

    摘要: An apparatus for detecting turbine blade passing times includes a sensor for producing an input signal each time a blade passes the sensor. Automatic gain control circuitry including a digital multiplier, peak detector and error amplifier regulates the amplitude of the input signal. A zero-crossing detector produces an output signal each time the input signal crosses a reference axis. A pre-trigger comparator produces a gating signal coinciding with the expected arrival time of the blade at the sensor. A gating device is responsive to the gating signal for conducting output signals which occur during the expected arrival time of the blade at the sensor. A monostable vibrator produces a digital pulse coinciding with the time at which the blade passes the sensor.

    摘要翻译: 用于检测涡轮机叶片通过时间的装置包括用于每当叶片通过传感器时产生输入信号的传感器。 包括数字乘法器,峰值检测器和误差放大器的自动增益控制电路调节输入信号的幅度。 每当输入信号与参考轴交叉时,过零检测器产生一个输出信号。 预触发比较器产生与刀片在传感器的预期到达时间相符的门控信号。 选通装置响应门控信号用于传导在刀片在传感器的预期到达时间期间发生的输出信号。 单稳态振动器产生与刀片通过传感器的时间一致的数字脉冲。