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过套管电阻率测井仪器的信号源位于地面,要求信号源具有大电压、大电流、超低频、高稳定度、高分辨率等特点。针对该测井技术的特点,提出利用直接数字频率合成技术产生要求的正弦测井激励信号,利用小功率低压器件的串联实现信号的大功率大电压输出,利用电源跟踪技术在一定程度上降低功率器件的损耗,提高电路的工作效率。实验结果表明,信号源输出频率1~15 Hz,频率分辨率为0.004 Hz,频率稳定度为±5×10-6/1 h,输出电压范围为±300 V,输出电流≤6 A,输出功率为900 W。该设计已成功用于过套管电阻率nV级极微弱电信号采集理论与实验研究项目中。
The signal source of the casing resistivity logging instrument is located on the ground, requiring the signal source to have the characteristics of large voltage, high current, ultra-low frequency, high stability and high resolution. According to the characteristics of this logging technology, it is proposed to use the direct digital frequency synthesis technology to generate the required sinusoidal logging excitation signal, to use high power low voltage devices in series to achieve high power and voltage output of the signal, and to use power tracking technology to reduce the power to a certain extent Device loss, improve the work efficiency of the circuit. The experimental results show that the output frequency of the signal source is 1-15 Hz, the frequency resolution is 0.004 Hz, the frequency stability is ± 5 × 10-6 / 1 h, the output voltage range is ± 300 V, the output current is ≤ 6 A, the output power 900 W The design has been successfully used in the casing resistance nV very weak electrical signal acquisition theory and experimental research project.