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1.发明授权
公开(公告)号：US4922757A
公开(公告)日：1990-05-08
申请号：US205770
申请日：1988-06-13
摘要： An apparatus for detecting blade passing times includes a sensor for producing an input signal each time a blade passes the sensor. A zero crossing detector produces an output signal each time the input signal crosses a reference axis. A phase shifter shifts the phase of the input signal to produce 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.
摘要翻译： 用于检测刀片通过次数的装置包括每当刀片通过传感器时产生输入信号的传感器。 零交叉检测器每当输入信号与基准轴交叉时产生输出信号。 移相器移位输入信号的相位以产生与传感器上的叶片的预期到达时间一致的选通信号。 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。
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公开(公告)号：US4899383A
公开(公告)日：1990-02-06
申请号：US94186
申请日：1987-09-08
申请人： Charles W. Einolf, Jr. , Harold B. Shutterly , Shan C. Sun , Russel W. Gonnam , Roger E. Ray , Karl C. Koch , Pamela M. Maynard-Nenno
发明人： Charles W. Einolf, Jr. , Harold B. Shutterly , Shan C. Sun , Russel W. Gonnam , Roger E. Ray , Karl C. Koch , Pamela M. Maynard-Nenno
CPC分类号： H04J3/0608 , H02H1/0069
摘要： The multiplexer in a multichannel, secure digital communication system repetitively embeds a sequence of byte length uniquely coded synchronizing signals in each of n successive frames of one channel of a multichannel, time multiplexed digital bit stream. Redundant protective relay data and associated parity check data are embedded in four of the n frames in a second, preferably adjacent channel, with the remaining of the n frames in the second channel containing additional of the uniquely coded synchronizing signals. The time multiplexed serial bit stream is transmitted to a remote station, preferably by fiber optic communications media. The most recent bits of the received serial bit stream equal in number to the number of bits spanned by the two channels in n frames are retained in n-1 serially connected serial in, serial out shift registers. Sixteen bit portions, a frame apart, of the retained most recent bits of the serial bit stream are applied to n serial in, parallel out shift registers. The parallel outputs of these shift registers corresponding to the frames of the two channels encoded with the synchronizing signals are compared with the sequence of uniquely coded signals stored in addresses in PROMs. When the compared signals match, which will occur once in every n frames, a synchronization signal is generated and the protective relay data and parity check data are read directly from the other parallel outputs of the serial in, parallel out shift registers. Similar rapid resynchronization of voice and data channels in the time multiplexed serial bit stream can be achieved by counting the number of bits in the bit stream from the generation of the synchronization signal in the relay protection channels to the beginning of the time slot for a selected voice or data channel.
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3.发明授权
公开(公告)号：US5015949A
公开(公告)日：1991-05-14
申请号：US288592
申请日：1988-12-22
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。
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公开(公告)号：US4817208A
公开(公告)日：1989-03-28
申请号：US94185
申请日：1987-09-08
IPC分类号： H04B10/158 , H04B9/00
CPC分类号： H04B10/6973 , H04B10/6932
摘要： An optical receiver especially useful for digital fiber optic systems operating a high pulse rates, converts the pulsed current signal generated by a PIN diode into a pulsed voltage utilizing a current to voltage converter comprising an FET input transistor, a complimentary cascoded bipolar transistor, and a large feedback resistor to reduce noise while providing a wide band width and dynamic range. The pulsed voltage signal is amplitude limited in a limiting amplifier and passed through a low pass filter to remove excess bandwidth and further reduced noise before being applied to a high speed comparator which generates the digital output. The pulsed voltage signal is passed from the current to voltage converter to the limiting amplifier through an emitter follower coupling transistor to isolate the open loop gain of the current to voltage converter so that its band width will not be changed with load.
摘要翻译： 特别适用于操作高脉冲速率的数字光纤系统的光学接收器，利用包括FET输入晶体管，互补级联双极晶体管的电流 - 电压转换器将由PIN二极管产生的脉冲电流信号转换为脉冲电压， 大反馈电阻降低噪声，同时提供宽带宽和动态范围。 脉冲电压信号在限幅放大器中受到幅度限制，并通过低通滤波器以去除多余的带宽，并在施加到产生数字输出的高速比较器之前进一步降低噪声。 脉冲电压信号通过射极跟随器耦合晶体管从电流到电压转换器传递到限幅放大器，以隔离电流与电压转换器的开环增益，使其带宽不会随着负载而改变。
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公开(公告)号：US4679111A
公开(公告)日：1987-07-07
申请号：US797335
申请日：1985-11-12
CPC分类号： G01R31/346 , H02H3/17 , H02H7/08
摘要： A circuit arrangement for monitoring ground faults to a normally ungrounded coil of a motor, the circuit arrangement including;a source of a low-level d.c. voltage, the source having first and second output terminals between which the d.c. voltage is established and a conductive connection being established between the first output terminal and the motor coil;a current responsive unit connected between a point at ground potential relative to the motor coil and the second output terminal of the source for producing an output signal proportional to the amplitude of current flow between the second terminal and ground; anda motor control unit connected for preventing operation of the motor when the output signal from the current responsive means reaches a selected value.
摘要翻译： 一种用于将接地故障监测到电动机的正常未接地线圈的电路装置，所述电路装置包括： 低级别的来源 电压源，其具有第一和第二输出端子，其间具有直流电压。 建立电压并且在第一输出端子和电动机线圈之间建立导电连接; 电流响应单元，连接在相对于电机线圈的接地电位点和源极的第二输出端子之间，用于产生与第二端子和地之间的电流的幅度成比例的输出信号; 以及电动机控制单元，其连接用于当来自电流响应装置的输出信号达到选定值时防止电动机的运行。
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