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公开(公告)号：US07259952B2
公开(公告)日：2007-08-21
申请号：US11243038
申请日：2005-10-04
IPC分类号： H02H9/00
摘要： A process control instrument includes a circuit board having a control circuit for generating or receiving a high frequency signal. An antenna includes an electrical conductor. An intrinsic safety circuit couples the control circuit to the antenna and comprises a microstrip transmission line on the circuit board electrically connecting the control circuit to the electrical conductor. A safety stub has a first end electrically connected to the transmission line proximate the electrical conductor and a second end connected to a ground of the control circuit.
摘要翻译： 一种过程控制仪器包括具有用于产生或接收高频信号的控制电路的电路板。 天线包括电导体。 固有安全电路将控制电路耦合到天线，并且包括电路板上的微带传输线，其将控制电路电连接到电导体。 安全短截线具有电连接到靠近电导体的传输线的第一端和连接到控制电路的地的第二端。
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公开(公告)号：US06980174B2
公开(公告)日：2005-12-27
申请号：US10675666
申请日：2003-09-30
摘要： A process control instrument includes a circuit board having a control circuit for generating or receiving a high frequency signal. An antenna includes an electrical conductor. An intrinsic safety circuit couples the control circuit to the antenna and comprises a microstrip transmission line on the circuit board electrically connecting the control circuit to the electrical conductor. A safety stub has a first end electrically connected to the transmission line proximate the electrical conductor and a second end connected to a ground of the control circuit.
摘要翻译： 一种过程控制仪器包括具有用于产生或接收高频信号的控制电路的电路板。 天线包括电导体。 固有安全电路将控制电路耦合到天线，并且包括电路板上的微带传输线，其将控制电路电连接到电导体。 安全短截线具有电连接到靠近电导体的传输线的第一端和连接到控制电路的地的第二端。
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公开(公告)号：US07102584B2
公开(公告)日：2006-09-05
申请号：US10675651
申请日：2003-09-30
IPC分类号： H01O13/00
CPC分类号： H01Q1/22 , G01F23/284 , H01Q13/06 , H01Q19/08
摘要： A process control instrument comprises a control for generating or receiving a high frequency signal. A waveguide comprises a cylindrical housing closed at one end by a rear wall. A loop launcher is operatively connected to the control and comprises a wire having a first straight leg electrically connected at one end to the control and extending into the waveguide a first select length. A second straight leg is connected at one end to the rear wall and extends into the waveguide a second select length, greater than the first select length. A curved middle section connects the other ends of the first and second straight legs. An antenna is operatively coupled to the waveguide.
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公开(公告)号：US07106248B2
公开(公告)日：2006-09-12
申请号：US11204727
申请日：2005-08-16
CPC分类号： H01Q1/22 , G01F23/284 , H01Q13/06 , H01Q19/08
摘要： A process control instrument comprises a control for generating or receiving a high frequency signal. A waveguide comprises a cylindrical housing closed at one end by a rear wall. A loop launcher is operatively connected to the control and comprises a wire having a first straight leg electrically connected at one end to the control and extending into the waveguide a first select length. A second straight leg is connected at one end to the rear wall and extends into the waveguide a second select length, greater than the first select length. A curved middle section connects the other ends of the first and second straight legs. An antenna is operatively coupled to the waveguide.
摘要翻译： 过程控制仪器包括用于产生或接收高频信号的控制。 波导包括在一端由后壁封闭的圆柱形壳体。 环路发射器可操作地连接到控制器并且包括线，其具有在一端电连接到控制并且延伸到波导中的第一选择长度的第一直脚。 第二直腿在一端连接到后壁并且延伸到波导中大于第一选择长度的第二选择长度。 弯曲的中间部分连接第一和第二直腿的另一端。 天线可操作地耦合到波导。
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公开(公告)号：US20060017647A1
公开(公告)日：2006-01-26
申请号：US11243038
申请日：2005-10-04
IPC分类号： H01Q1/50
摘要： A process control instrument includes a circuit board having a control circuit for generating or receiving a high frequency signal. An antenna includes an electrical conductor. An intrinsic safety circuit couples the control circuit to the antenna and comprises a microstrip transmission line on the circuit board electrically connecting the control circuit to the electrical conductor. A safety stub has a first end electrically connected to the transmission line proximate the electrical conductor and a second end connected to a ground of the control circuit.
摘要翻译： 一种过程控制仪器包括具有用于产生或接收高频信号的控制电路的电路板。 天线包括电导体。 固有安全电路将控制电路耦合到天线，并且包括电路板上的微带传输线，其将控制电路电连接到电导体。 安全短截线具有电连接到靠近电导体的传输线的第一端和连接到控制电路的地的第二端。
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公开(公告)号：US20050280573A1
公开(公告)日：2005-12-22
申请号：US11204727
申请日：2005-08-16
CPC分类号： H01Q1/22 , G01F23/284 , H01Q13/06 , H01Q19/08
摘要： A process control instrument comprises a control for generating or receiving a high frequency signal. A waveguide comprises a cylindrical housing closed at one end by a rear wall. A loop launcher is operatively connected to the control and comprises a wire having a first straight leg electrically connected at one end to the control and extending into the waveguide a first select length. A second straight leg is connected at one end to the rear wall and extends into the waveguide a second select length, greater than the first select length. A curved middle section connects the other ends of the first and second straight legs. An antenna is operatively coupled to the waveguide.
摘要翻译： 过程控制仪器包括用于产生或接收高频信号的控制。 波导包括在一端由后壁封闭的圆柱形壳体。 环路发射器可操作地连接到控制器并且包括线，其具有在一端电连接到控制并且延伸到波导中的第一选择长度的第一直脚。 第二直腿在一端连接到后壁并且延伸到波导中大于第一选择长度的第二选择长度。 弯曲的中间部分连接第一和第二直腿的另一端。 天线可操作地耦合到波导。
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公开(公告)号：US5943294A
公开(公告)日：1999-08-24
申请号：US70727
申请日：1998-05-01
IPC分类号： G01F23/296 , G01S7/521 , G01S7/526 , G01S15/02
CPC分类号： G01F23/2965 , G01F23/2967 , G01S7/521 , G01S7/526 , Y10S367/908
摘要： A vibrating probe for detecting a threshold level within a vessel of fluent material, particularly a liquid, includes: an ultrasonic acoustic transducer assembly comprising a transducer element having a natural resonant frequency, and loading elements effective to shift that frequency to an effective resonant frequency of the assembly, the assembly being supported within the vessel and including a coupling member to couple the transducer acoustically to liquid reaching the threshold level, a transmitter generating pulses applied to the transducer element for repeatedly exciting the transducer element to cause the transducer assembly to resonate at its effective resonant frequency, a circuit for measuring the effective resonant frequency of the transducer over a ringdown period following cessation of each pulse, and a circuit for comparing the effective resonant frequency measured during the ringdown period following each pulse with a predetermined threshold level. The threshold level is selected so as to distinguish between the effective resonant frequency of the assembly in free air and a lower effective resonant frequency when coupled to fluent material through the coupling member. The damping effect of the fluent material, particularly if a viscous liquid, may accelerate the ringdown to an extent such that vibration is effectively suppressed before the end of the frequency measurement, thus further depressing the apparent measured frequency.
摘要翻译： 用于检测流体材料，特别是液体的容器内的阈值水平的振动探针包括：超声波换能器组件，其包括具有固有谐振频率的换能器元件和负载元件，其有效地将该频率移动到有效谐振频率 所述组件被支撑在所述容器内并且包括用于将所述换能器声学地耦合到达到阈值水平的液体的耦合构件;发射器，产生施加到所述换能器元件的脉冲，用于反复激励所述换能器元件，以使所述换能器组件在 其有效谐振频率，用于在每个脉冲停止之后的衰减周期中测量换能器的有效谐振频率的电路，以及用于将在每个脉冲之后的衰减周期期间测量的有效谐振频率与预定阈值电平进行比较的电路。 选择阈值电平以便在通过耦合构件耦合到流动材料时，区分自由空气中的组件的有效谐振频率和较低的有效谐振频率。 流动材料的阻尼效果，特别是粘性液体的阻尼作用可能会使振铃加速到在频率测量结束之前有效地抑制振动的程度，从而进一步降低表观测量频率。
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