贴井壁侧向中微弱信号的精确采集方法

Design of accurate acquisition circuit for weak signals in contacting sidewall laterolog

针对贴井壁侧向仪器中微弱信号难于精确采集的特点,提出了一种用于微弱信号的精确采集方法。通过优化电极连线,选择合适的工作频率和工作模式,做好信号屏蔽,主电流检测使用变压器隔离和放大,实现了贴井壁侧向仪器中微弱信号的精确检测。实验效果表明:应用该电路对微弱信号的采集精度提高了一个数量级左右,满足了仪器的设计需求。

The difficulty in the contacting sidewall laterolog is accurate acquisition of weak signals. According to the characteristic a method of accurate acquisition of weak signals is proposed. Through taking series of measures, such as, optimization of line connecting between electrodes, selection of suitable working frequency and mode, effectual signals shielding, using transformer for current detection, the accurate acquisition of weak signals in the contacting sidewall laterolog is realized. The experimental results shows that the acquisition accuracy of weak signals improves about one order of magnitude by application of new circuit, the circuit can be satisfied the requirement of instrument design.