双频激电仪接收机_李荡教材.pdfVIP

第 25 卷 第 12 期 电子测量与仪器学报 Vol. 25 No. 12 · 1078 · JOURNAL OF ELECTRONIC MEASUREMENT AND INSTRUMENT 2011 年 12 月 DOI: 10.3724/SP.J.1187.2011.01078 双频激电仪接收机* 李 荡 李志华 曾 信 (中国地质大学(武汉)机械与电子信息学院, 武汉 430074) 摘 要: 双频激电法是一种应用广泛的频率域激电法, 双频激电仪是基于双频激电法的一种物探仪器。该双频激电仪接收 机在接收到双频电流信号后, 经过简单的信号调理放大电路后由数据采集卡转换为数字信号并通过 USB 通信送入 PC 上位机。 在上位机中, LabVIEW 软件平台对该信号进行数据采集、滤波、隔直、双频信号分离、积分等处理后计算出视幅频率和视电阻 率这两个地质参数并实时图形显示文本保存。经实验测试, 该系统测量精度高, 测量速度快, 实测中可以测出明显的异常曲线, 符合地球物理仪器接收机的特点。特别是虚拟仪器的使用使得该设计中的硬件电路大大简化, 设计成本低, 开发周期短, 系统升 级快, 具有良好的开发前景。 关键词: 双频激电; 虚拟仪器; 接收机; LabVIEW 中图分类号: TB971 文献标识码: A 国家标准学科分类代码: 460.4045 Receiver of dual-frequency IP instrument Li Dang Li Zhihua Zeng Xin (Institute of Mechanical Electronic Information, China University of Geosciences, Wuhan 430074, China) Abstract: Dual-frequency IP method is a widely used frequency-domain IP method, the dual-frequency IP instrument is one kind of geophysical instrument based on dual-frequency IP method. The receiver of dual-frequency IP instrument receives dual-frequency current signal. Then the current signal passes through the conditioning and amplifying circuit. After that, the data acquisition system converts current signal into digital signal and sends digital signal to PC by USB communication. In PC, the LabVIEW software platform collects the digital signal, blocks DC value, separates the dual-frequency signal, integrals, calculates the two geophysical parameters amplitude-frequency rate and apparent resistivity rate, and then real-time graphical displays and saves to text file. The experimental tests proved that the system has hi