岩矿石标本宽频带电性参数快速测量方法研究  

Rapid measurement method of broadband electrical parameters of rock and mineral specimens

作　　者：付国红[1] 雷泽宁 程辉[1] 刘阳阳[1] Fu Guohong;Lei Zening;Cheng Hui;Liu Yangyang(Engineering Research Center of Mineral Resources Development Technology and Equipment for Deep Sea and Deep Earth,Ministry of Education,Hunan University of Science and Technology,Xiangtan 411201,China)

机构地区：[1]湖南科技大学深海深地矿产资源开发技术与装备教育部工程研究中心,湘潭411201

出　　处：《仪器仪表学报》2025年第2期152-164,共13页Chinese Journal of Scientific Instrument

基　　金：国家重点研发计划仪器专项(2022YFF0706201-2)项目资助。

摘　　要：岩矿石标本电性特征的研究是地球物理勘探中一项重要的基础性工作,针对变频法测量岩矿石标本电性参数存在效率低、抗干扰能力较差等问题,提出基于逆重复m序列的岩矿石标本宽频带电性参数测量方法并设计了测量系统。系统采用编码恒流信号激励的方式,利用编码信号源的频点分布特性和多频点数据处理手段,实现发送一组编码矩形波电流便可获得岩矿石标本多个频点响应信息的高效测量。介绍了逆重复m序列的信号特征,给出了多频点阻抗测量算法流程;通过理论与仿真相结合的方式研究了影响Howland压控电流源性能的重要因素;明晰了实验条件下导致高频段阻抗测量误差的主要因素并给出了校准方案;最后,搭建了测量系统并使用本系统与苏黎世MFIA阻抗分析仪进行了阻抗测量对比实验,结果表明:使用5阶信号时,测量效率相对变频法提高2.3倍,通过调整信号编码参数可实现不同频点密度的测量工作;系统测量频率范围覆盖1 mHz~100 kHz,阻容模型阻抗模值测量误差最大约为0.5%,相位误差最大为23 mrad;校准前后结果对比表明了校准方案在高频段测量的有效性。该系统能够实现宽频阻抗谱快速准确测量,为岩矿石标本电性参数测量提供了一种宽频带快速测量方法与技术支持,具有一定的理论研究意义与工程应用价值。Research on the electrical characteristics of rock and ore specimens is a fundamental aspect of geophysical exploration.Aiming at the problems of low efficiency and poor anti-interference ability in the measurement of electrical parameters of rock and ore specimens by frequency conversion method,a method for measuring the broadband electrical parameters of rock and ore specimens based on invert-repeated m-pesudo random binary sequence(IRmPRBS)is proposed and the corresponding measurement system is designed.The system adopts the method of coded constant current signal excitation,and uses the frequency distribution characteristics of the coded signal source along with the multi-frequency data processing method.By transmitting a set of coded rectangular wave currents,it efficiently measures the response information at multiple frequency points of rock and ore specimens.This paper introduces the signal characteristics of the inverse-repetitive m-sequence and presents the workflow of the multi-frequency impedance measurement algorithm.Additionally,it investigates the key factors affecting the performance of the Howland voltage-controlled current source through both theoretical analysis and simulation.The main sources of high-frequency impedance measurement errors under experimental conditions are clarified and the calibration scheme is given.Finally,the measurement system is built and the impedance measurement comparison experiment is carried out with the Zurich MFIA impedance analyzer.The results show that:Using a fifth-order signal improves measurement efficiency by 2.3 times compared to the frequency conversion method,and the measurement of different frequency points can be realized by adjusting the signal coding parameters;The system measurement frequency range covers 1 mHz~100 kHz.The maximum measurement error of the impedance modulus of the resistance-capacitance model is about 0.5%,and the phase maximum error is about 23 mrad.The comparison of the results before and after calibration shows the effectiveness of

关 键 词：岩矿石标本 宽频带 电性参数 快速测量 逆重复m序列 Howland电流源 

分 类 号：TH763.1[机械工程—仪器科学与技术] TM934.73[机械工程—精密仪器及机械]