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频率分时传输
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  相似匹配句对
     Beam propagation law in spatial-temporal frequency domain
     时空频率域中的光束传输定律
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     The Frequency Synchronization of Transmitter Diversity Schemes for OFDM System
     OFDM传输分集中的频率同步
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     FREQUENCY-CORRELATION TIME-DIVISION INFRARED PLANE DETECTING TECHNIQUE
     频率相关分时红外平面检测技术
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     ON FREQUENCIES
     频率
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     FREQUENCY
     生死频率
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To obtain pressures and temperatures of the formations in oil and gas well testing,a downhole wireline remote telemetry method is developed by using time division frequency transmission technology in the 'Pressure-Low-Temperature-Low' mode.It also enables to supply power to the downhole tool on a single-core wired-armored cable.The coded pulse data are modulated on power signals.Then the surface processor uses double countered synchronism method to measure the pressure/temperature frequencies.A fitting algorithm...

To obtain pressures and temperatures of the formations in oil and gas well testing,a downhole wireline remote telemetry method is developed by using time division frequency transmission technology in the 'Pressure-Low-Temperature-Low' mode.It also enables to supply power to the downhole tool on a single-core wired-armored cable.The coded pulse data are modulated on power signals.Then the surface processor uses double countered synchronism method to measure the pressure/temperature frequencies.A fitting algorithm is presented to solve actual pressures and temperatures.The results show that the developed methods can satisfy the requirements of downhole remote telemetry and surface readout using a wireline-conveyed gauge.The system has been successfully applied to the onshore well testing with a pressure accuracy of 0.1%FS and temperature accuracy of ±0.5℃.

为获取井下待测地层的压力/温度,提出了一种“压力-空-温度-空”缆芯复用的频率分时传输方法.将脉冲数据与直流能量叠加,以电流形式馈入电缆,实现能量/数据的耦合传输.利用双计数器同步测频消除了1个字误差,并设计了压力/温度实际值的拟合算法.试验结果表明,该测量方法能够满足井下远距离传输的要求,可与电子压力计配合实现地面直读测量,压力测量精度为0.1%FS,温度测量精度为±0.5℃.

 
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