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公开(公告)号：US4100483A
公开(公告)日：1978-07-11
申请号：US755406
申请日：1976-12-29
CPC分类号： G01V3/30
摘要： A dielectric well logging system includes a logging tool adapted to be passed through a borehole traversing an earth formation. The logging tool includes a transmitter which induces electric energy into the earth formation at a radio frequency. Two receivers in the logging tool spaced a predetermined distance apart provides intermediate frequency signals corresponding to the electrical energy received from the earth formation. The intermediate frequency signals are transmitted by way of a cable to the surface. Surface electronics include zero crossing detectors, each detector receives a different intermediate frequency signal from the cable and provides a detector signal whose change in amplitude is representative of the intermediate frequency signal passing through zero. A source provides clock pulses at a frequency substantially greater than the frequency of the intermediate frequency signals. A logic circuit receiving the detector signals and the clock pulses provides groups of clock pulses in accordance with the detector signals. The number of clock pulses in each group corresponds to the dielectric constant of the earth formation.
摘要翻译： 电介质测井系统包括适于通过穿过地层的钻孔的测井工具。 测井工具包括一个发射器，它以无线电频率将电能引入地层。 在测井工具中隔开预定距离的两个接收器提供对应于从地层接收的电能的中频信号。 中频信号通过电缆传输到表面。 表面电子学包括过零检测器，每个检测器从电缆接收不同的中频信号，并提供检测器信号，其振幅变化代表通过零的中频信号。 源提供的时钟脉冲频率基本上大于中频信号的频率。 接收检测器信号和时钟脉冲的逻辑电路根据检测器信号提供一组时钟脉冲。 每组中的时钟脉冲数对应于地层的介电常数。
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公开(公告)号：US06188279B1
公开(公告)日：2001-02-13
申请号：US09433128
申请日：1999-11-03
IPC分类号： H03F126
CPC分类号： H03F1/3252 , H03F1/3276
摘要： A broadband linearizer for use with a power amplifier. The broadband linearizer includes a preamplifier, a postamplifier and a broadband linearizer bridge coupled between the preamplifier and postamplifier. The linearizer bridge comprises a power divider for coupling power to linear and nonlinear arms, and a power combiner for combining outputs of the linear and nonlinear arms. The linear arm includes a first equalizer and a delay line, and the nonlinear arm includes a distortion generator and an attenuator. A second equalizer is coupled between the power combiner and the postamplifier. A control circuit controls settings of the preamplifier, the broadband linearizer bridge, and the postamplifier. The control circuit outputs voltage bias and constant current signals to control operation of the broadband linearizer. The broadband linearizer provides for independent, flexible gain and phase control that can mate with different kinds of power amplifiers, such as travelling wave tube amplifiers and solid state power amplifiers having various gain and phase performance.
摘要翻译： 用于功率放大器的宽带线性化电路。 宽带线性化器包括前置放大器，后置放大器和耦合在前置放大器和后置放大器之间的宽带线性化电路桥。 线性化电桥包括用于将功率耦合到线性和非线性臂的功率分配器和用于组合线性和非线性臂的输出的功率组合器。 线性臂包括第一均衡器和延迟线，非线性臂包括失真发生器和衰减器。 功率组合器和后置放大器之间耦合第二均衡器。 控制电路控制前置放大器，宽带线性化电路桥和后置放大器的设置。 控制电路输出电压偏置和恒流信号，以控制宽带线性化电路的工作。 宽带线性化电路提供独立，灵活的增益和相位控制，可以与不同种类的功率放大器匹配，如行波管放大器和具有各种增益和相位性能的固态功率放大器。
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3.发明授权
公开(公告)号：US4107597A
公开(公告)日：1978-08-15
申请号：US749845
申请日：1976-12-13
CPC分类号： G01V3/30
摘要： The invention disclosed herein includes methods and apparatus for determining true formation resistivity, flushed zone resistivity and invasion diameter of the earth formation in the vicinity of a well borehole. A radio frequency electromagnetic field in the frequency range from 800 kilohertz to 4 megahertz is generated in a borehole and the electromagnetic field is detected at a plurality of longitudinally spaced locations. Measurements of the attenuation and propagation velocity of the electromagnetic wave at the longitudinally spaced receivers may then be interpreted according to predetermined relationships in terms of the formation resistivity, flushed zone resistivity and invasion diameter surrounding the borehole.
摘要翻译： 本文公开的发明包括用于确定井眼附近的地层的真实地层电阻率，冲刷区电阻率和侵入直径的方法和装置。 在钻孔中产生频率范围从800千赫兹到4兆赫兹的射频电磁场，并且在多个纵向间隔位置检测电磁场。 然后可以根据围绕钻孔的地层电阻率，冲刷区电阻率和入侵直径根据预定的关系来解释在纵向间隔的接收器处的电磁波的衰减和传播速度的测量。
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4.发明授权
公开(公告)号：US4107598A
公开(公告)日：1978-08-15
申请号：US800500
申请日：1977-05-25
摘要： A system operating at radio frequencies in the range of 10 MHZ to 60 MHZ is provided for simultaneously determining the resistivity and dielectric constant of earth formations in the vicinity of a well bore. A transmitter coil and two longitudinally spaced receiver coils are provided in the system. Circuit means for measuring the unnormalized amplitude ratio and the relative phase shift of electromagnetic waves at the spaced receiver coils are provided. A relationship is given whereby the formation dielectric constant and resistivity may be obtained from the amplitude ratio and relative phase shift measurements.
摘要翻译： 提供了在10MHz至60MHz范围内的射频操作的系统，用于同时确定井眼附近地层的电阻率和介电常数。 发射机线圈和两个纵向间隔的接收器线圈设置在系统中。 提供用于测量非标准化幅度比和在隔开的接收器线圈处的电磁波的相对相移的电路装置。 给出一种关系，由此可以从振幅比和相对相移测量中获得形成介电常数和电阻率。
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