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公开(公告)号：US4375057A
公开(公告)日：1983-02-22
申请号：US215205
申请日：1980-12-10
申请人： Andrew P. Weise , George R. Wisner
发明人： Andrew P. Weise , George R. Wisner
CPC分类号： B66B1/3492 , G01D5/48 , G01S13/38
摘要： Microwave signals are injected at one end of a slotted waveguide containing a shorting stub which is moved along the length of the waveguide. The distance to the shorting stub is determined from the comparative phase characteristics of the injected signals reflected back from the shorting stub.
摘要翻译： 微波信号在包含沿着波导的长度移动的短路短截线的开槽波导的一端处被注入。 从短路短截线反射的注入信号的比较相位特性确定到短路短截线的距离。
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公开(公告)号：US4926120A
公开(公告)日：1990-05-15
申请号：US290531
申请日：1988-12-27
CPC分类号： G01V3/101
摘要： An arrangement for detecting metallic particles carried by a fluid includes a metallic probe member which surrounds an elongated passage through which the fluid flows and which is constituted by a split tube having two marginal portions delimiting a gap which extends along said passage and completely separates the marginal portions from one another. Capacitors are arranged at the gap and alternating electric current is caused to flow in the probe member around the passage so that the probe member and the capacitors form a tank circuit having resonance characteristics that are influenced by any inclusion then present in the passage in a manner dependent on the electromagnetic properties of the inclusion. The character of any metallic particle then present in the passage is determined from variations in the alternating electric current that reflect the influence of such metallic particle on the resonance characteristics.
摘要翻译： 用于检测由流体携带的金属颗粒的装置包括金属探针构件，该金属探针构件围绕流体流过的细长通道，该金属探针构件由具有限定沿着所述通道延伸的间隙的两个边缘部分的分裂管构成，并且完全分离边缘 部分彼此。 电容器布置在间隙处，并且使交流电流在通道周围的探针构件中流动，使得探针构件和电容器形成谐振特性的谐振特性，该谐振特性受到以通道中存在的任何夹杂物的影响 取决于夹杂物的电磁特性。 然后存在于通道中的任何金属颗粒的特性由反映这种金属颗粒对共振特性的影响的交流电流的变化确定。
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公开(公告)号：US5617308A
公开(公告)日：1997-04-01
申请号：US337343
申请日：1994-11-10
申请人： Andrew P. Weise , Donald P. Cornell
发明人： Andrew P. Weise , Donald P. Cornell
IPC分类号： H02M1/08 , H02M7/48 , H02P27/06 , H02M7/5387
CPC分类号： H02M7/4826
摘要： A resonant link inverter control for driving a multi-phase induction motor through three feed lines each connected to opposite sides of a DC bus by a pair of switches. A resonant tank circuit connects a source of DC voltage through an inductor to the DC bus and provides a tank capacitor in parallel with the DC bus. A bipolar transistor having an anti-parallel diode, which is in series with a clamp capacitor to form a clamp circuit connected across the tank inductance, is turned off in response to the clamp current bearing a predetermined relationship to voltage across the clamp circuit as well as voltage across the DC source. The current in each feed line is sampled in response to clamp current which is just slightly less than that which causes turnoff of the clamp transistor.
摘要翻译： 一种谐振链路逆变器控制，用于通过三条馈线驱动多相感应电动机，每条馈线通过一对开关连接到DC总线的相对侧。 谐振回路将直流电压源通过电感器连接到直流总线，并提供与直流母线并联的储能电容器。 具有反并联二极管的双极晶体管与钳位电容器串联以形成连接在电容器电感上的钳位电路，其响应于钳位电流被切断，钳位电流也与钳位电路两端的电压成预定关系 作为直流电源两端的电压。 响应于钳位电流对每个馈线中的电流进行采样，该钳位电流略小于导致钳位晶体管截止的钳位电流。
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4.发明授权
公开(公告)号：US5041856A
公开(公告)日：1991-08-20
申请号：US455103
申请日：1989-12-22
IPC分类号： G01V3/10
CPC分类号： G01V3/101
摘要： An arrangement for detecting metallic particles carried by a fluid includes a metallic probe member which surrounds an elongated passage through which the fluid flows and which is constituted by a split tube having two marginal portions delimiting a gap which extends along said passage and completely separates the marginal portions from one another. Capacitors are arranged at the gap and alternating electric current is caused to flow in the probe member around the passage so that the probe member and the capacitors form a tank circuit having resonance characteristics that are influenced by any inclusion then present in the passage in a manner dependent on the electromagnetic properties of the inclusion. The character of any metallic particle then present in the passage is determined from variations in the alternating electric current that reflect the influence of such metallic particle on the resonance characteristics.
摘要翻译： 用于检测由流体携带的金属颗粒的装置包括金属探针构件，该金属探针构件围绕流体流过的细长通道，该金属探针构件由具有限定沿着所述通道延伸的间隙的两个边缘部分的分裂管构成，并且完全分离边缘 部分彼此。 电容器布置在间隙处，并且使交流电流在通道周围的探针构件中流动，使得探针构件和电容器形成谐振特性的谐振特性，该谐振特性受到以通道中存在的任何夹杂物的影响 取决于夹杂物的电磁特性。 然后存在于通道中的任何金属颗粒的特性由反映这种金属颗粒对共振特性的影响的交流电流的变化确定。
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