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公开(公告)号：US09121942B2
公开(公告)日：2015-09-01
申请号：US13668580
申请日：2012-11-05
发明人： Timothy S. Sussman
IPC分类号： G01S13/08 , G01S13/88 , G01S7/483 , G01F23/284 , G01S13/10
CPC分类号： G01S13/88 , G01F23/284 , G01S7/483 , G01S13/10
摘要： A guided wave radar level measurement instrument comprises a probe defining a transmission line for sensing material level. A probe interface circuit is connected to the probe for generating pulses on the transmission line and receiving reflected signals from the transmission line. The probe interface circuit comprises a transmit pulse generator for generating a transmit pulse, a sample pulse generator for generating a sample pulse, and a delay lock loop for controlling the transmit and sample pulse generators. The delay lock loop is controlled by a pulse repetition frequency having a duty cycle less than 50%.
摘要翻译： 导波雷达液位测量仪器包括一个定义用于感测材料水平的传输线的探头。 探头接口电路连接到探头，用于在传输线上产生脉冲并接收来自传输线的反射信号。 探头接口电路包括用于产生发射脉冲的发射脉冲发生器，用于产生采样脉冲的采样脉冲发生器和用于控制发射和采样脉冲发生器的延迟锁定环路。 延迟锁定环由占空比小于50％的脉冲重复频率控制。
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公开(公告)号：US20180209833A1
公开(公告)日：2018-07-26
申请号：US15676170
申请日：2017-08-14
CPC分类号： G01F23/284 , G01S7/003 , G01S13/10 , G01S13/88 , G01S2007/027 , G08C19/02 , H01Q1/22 , H01Q1/225 , H01Q13/02 , H01Q13/06 , H01Q19/08 , H02J50/10 , H02J50/80
摘要： A loop powered process instrument comprises a control system measuring a process variable and developing a measurement signal representing the process variable. A two-wire circuit, for connection to a remote power source using a two-wire process loop, controls current on the loop in accordance with the measurement signal. A power supply with galvanic isolation is connected to the two-wire circuit and the control system to isolate the two-wire circuit from the control system. The power supply receives power from the two-wire process loop and supplies power to the control system. The power supply comprises a voltage regulator receiving loop power and developing a regulated output voltage. A current switching circuit receives the regulated output voltage and drives a primary of a transformer. A secondary of the transformer is coupled to the control system. A voltage shift control includes an isolator circuit driven by the control system for controlling voltage supplied by the voltage regulator.
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公开(公告)号：US20140125513A1
公开(公告)日：2014-05-08
申请号：US13668580
申请日：2012-11-05
发明人： Timothy S. Sussman
IPC分类号： G01S13/08
CPC分类号： G01S13/88 , G01F23/284 , G01S7/483 , G01S13/10
摘要： A guided wave radar level measurement instrument comprises a probe defining a transmission line for sensing material level. A probe interface circuit is connected to the probe for generating pulses on the transmission line and receiving reflected signals from the transmission line. The probe interface circuit comprises a transmit pulse generator for generating a transmit pulse, a sample pulse generator for generating a sample pulse, and a delay lock loop for controlling the transmit and sample pulse generators. The delay lock loop is controlled by a pulse repetition frequency having a duty cycle less than 50%.
摘要翻译： 导波雷达液位测量仪器包括一个定义用于感测材料水平的传输线的探头。 探头接口电路连接到探头，用于在传输线上产生脉冲并接收来自传输线的反射信号。 探头接口电路包括用于产生发射脉冲的发射脉冲发生器，用于产生采样脉冲的采样脉冲发生器和用于控制发射和采样脉冲发生器的延迟锁定环路。 延迟锁定环由占空比小于50％的脉冲重复频率控制。
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公开(公告)号：US20180212648A1
公开(公告)日：2018-07-26
申请号：US15651275
申请日：2017-07-17
摘要： A loop powered process instrument comprises a control system including a control circuit, a modem circuit and a loop output circuit. The control circuit measures a process variable and develops a measurement signal representing the process variable and includes a loop control circuit and a communication circuit. The modem circuit is operatively connected to the communication circuit and includes a modulation input port and a modulation output port. The loop output circuit receives a measurement signal from the loop control circuit and is connected to the modulation input port. A two-wire circuit is for connection to a remote power source using a two-wire process loop. A power supply with isolation is connected to the two-wire circuit and the loop output circuit to isolate the two-wire circuit from the control system. The power supply receives power from the two-wire process loop and supplies power to the control system and draws loop current on the two-wire process loop in accordance with the measurement signal and provides the modulation output on the loop current. A bypass circuit with isolation is connected between the two-wire circuit and the modem circuit modulation input port for providing input modulated signals to the modem circuit bypassing the power supply.
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公开(公告)号：US10033434B1
公开(公告)日：2018-07-24
申请号：US15651275
申请日：2017-07-17
摘要： A loop powered process instrument comprises a control system including a control circuit, a modem circuit and a loop output circuit. The control circuit measures a process variable and develops a measurement signal representing the process variable and includes a loop control circuit and a communication circuit. The modem circuit is operatively connected to the communication circuit and includes a modulation input port and a modulation output port. The loop output circuit receives a measurement signal from the loop control circuit and is connected to the modulation input port. A two-wire circuit is for connection to a remote power source using a two-wire process loop. A power supply with isolation is connected to the two-wire circuit and the loop output circuit to isolate the two-wire circuit from the control system. The power supply receives power from the two-wire process loop and supplies power to the control system and draws loop current on the two-wire process loop in accordance with the measurement signal and provides the modulation output on the loop current. A bypass circuit with isolation is connected between the two-wire circuit and the modem circuit modulation input port for providing input modulated signals to the modem circuit bypassing the power supply.
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公开(公告)号：US20140118185A1
公开(公告)日：2014-05-01
申请号：US14059752
申请日：2013-10-22
IPC分类号： G01F23/284
CPC分类号： G01F23/284
摘要： A process measurement instrument including a fiducial and adapted for detection of the fiducial. The instrument comprises an interface circuit comprising a drive circuit for transmitting a pulse signal at the fiducial and at a target of interest and a receive circuit receiving reflected echoes of the pulse signal and developing an analog receive signal representative of the reflected echoes. A signal processing circuit is operatively coupled to the interface circuit for receiving the analog receive signal and determining characteristics of reflected echoes for the fiducial and the target of interest. The controller is operatively coupled to the signal processing circuit and includes a diagnostic routine responsive to the characteristics of the reflected echo for the fiducial in determining if a fiducial error condition exists.
摘要翻译： 一种过程测量仪器，包括基准并适于检测基准。 该仪器包括接口电路，该接口电路包括用于在基准点处和目标点处发送脉冲信号的驱动电路和接收脉冲信号的反射回波的接收电路，并且形成表示反射回波的模拟接收信号。 信号处理电路可操作地耦合到接口电路，用于接收模拟接收信号并且确定用于基准和感兴趣的目标的反射回波的特性。 控制器可操作地耦合到信号处理电路，并且包括响应于基准的反射回波的特性的诊断程序，以确定是否存在基准误差条件。
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