微机化交流电阻率仪及其应用

MICROCOMPUTERIZED ALTERNATING RESISTIVITY INSTRUMENT AND ITS APPLICATION

本文给出了交流电阻率仪的设计原理框图,讨论了同步检测技术及其特点,介绍了仪器系统压制干扰的室内测试结果和野外实验结果,指出了该仪器的应用及开发远景。

Up to now,DDC-2A type value instrument (produced by Geological Instrument Factory,Shanghai)and DDCJ-1 type transistor instrument (produced by Geological Instrument Factory, Chongqing)are still tie major resistivity instruments used in mineral, petroleum and groundwater exploration in our c'ountry. But under the circumstances of strong disturbances, these instruments couldn't work due to their fragmentary setting which made them less automatic and easily to be affected by temperature and zero drift of the individual components.Following the advance in geophsieal prospectin the resistivity instruments are demanded for high precision and anti-distrubance ability.For this purpose, we have designed the alternating resistivity instrument provided with all the CMOS integrated circuit and the CMOS single chip microcontroller.The paper has described the detecting principle and testing results.