分布式井-地电位梯度无线接收系统的设计

Design and Implementation of the Distributed Wireless Borehole-surface Potential Gradient Detection System

为了满足井地电法勘探中高分辨率勘探、地形复杂地区勘探和大范围勘探的需求,研制出一种分布式井-地电位梯度无线接收系统。该系统采用31位Δ-Σ型ADC实现了高分辨率数据采集;利用GPS同步技术实现了多通道数据的同步采集;通过STM32微处理、Zig Bee无线技术和SD卡联用实现数据接收系统的工作流程控制,数据预处理和存储。试验结果表明:该系统的均方根噪声为0.5μV,动态范围为140 d B;可准确探测出异常体,能够满足井-地电位梯度数据采集的需求。

In order to satisfy the needs of high resolution exploration,complex terrain area exploration,and large range exploration for borehole-surface electrical method,distributed wireless detection system of borehole-surface potential gradient is development. The system realizes high-performance data acquisition by using a 31-bit Delta-Sigma analog to digital converter. GPS synchronization technology is used to achieve the multi-channel synchronous data acquisition. In this data acquisition system,microcontroller STM32,Zig Bee wireless transceiver and SD card are used to realize workflow control,data preprocessing,and data storage. The test results of laboratory experiment show that： the RMS noise is 0. 5 uv,the dynamic range is 140 d B,the system can accurately detect the presence of abnormal body. It shows that the design meets the needs of borehole-surface potential gradient detection.