阵列式浅地表电磁探测系统控制模式研究
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摘要
以现场可编程门阵列(FPGA)+数字信号处理(DSP)+工控机为架构实现多模块阵列探测,每个模块以单独的FPGA+DSP双核异构框架处理和传输采集的数据,多个模块通过网络将探测数据快速上传至工控机,满足浅地表电磁探测对探测效率及实时性的要求;针对多模块探测阵列中模块间系统同步精度的影响而带来的模块间的天线互扰问题,通过对探测系统的发射和接收、处理数据、上传数据等部分的工作时间的拆分,采用时间分片的控制策略,将多个模块的发射时间完全错开,有效地消除天线的互扰,与发射同步控制方案相比,有效抑制了噪声。实际探测试验表明,系统完成单点探测所有任务的时间小于20 ms,效果良好,验证了提出的阵列式电磁探测系统的性能与控制模式的实用性。
This paper realizes multi-module array detection based on the framework of field-programmable gate array( FPGA),digital signal processing( DSP) and industrial control computer. To meet the requirements of detection efficiency and real-time performance for shallow surface electromagnetic detection,the detection data is quickly uploaded to the industrial control computer through network interface by multiple modules,each of which processes and transmits the collected data with a separate dual-core heterogeneous framework based on FPGA and DSP. To solve the antenna interference problem in multi-module detection array caused by synchronization precision among different modules,this paper adopts the control strategy of time slicing to schedule the working time for launching,receiving,processing and uploading data. The proposed method staggers the launch time of multiple modules completely and eliminates the antenna interference effectively. Besides,the proposed method can also suppress noise compared with the launch synchronization control method. The actual detection experiment shows that the time for completing single-point detection task is less than20 ms,validating the performance of the proposed array electromagnetic detection system and the practicability of the control mode.
This paper realizes multi-module array detection based on the framework of field-programmable gate array( FPGA),digital signal processing( DSP) and industrial control computer. To meet the requirements of detection efficiency and real-time performance for shallow surface electromagnetic detection,the detection data is quickly uploaded to the industrial control computer through network interface by multiple modules,each of which processes and transmits the collected data with a separate dual-core heterogeneous framework based on FPGA and DSP. To solve the antenna interference problem in multi-module detection array caused by synchronization precision among different modules,this paper adopts the control strategy of time slicing to schedule the working time for launching,receiving,processing and uploading data. The proposed method staggers the launch time of multiple modules completely and eliminates the antenna interference effectively. Besides,the proposed method can also suppress noise compared with the launch synchronization control method. The actual detection experiment shows that the time for completing single-point detection task is less than20 ms,validating the performance of the proposed array electromagnetic detection system and the practicability of the control mode.
引文
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[16]高云泽,叶盛波,张晓娟,等.基于电磁感应和超宽带雷达的新型探测系统[J].电子测量技术,2015,38(9):128-134.GAO Y Z,YE SH B,ZHANG X J,et al.Novel detection system based on EMI and UWB[J].Electronic Measurement Technology,2015,38(9):128-134.
[2]林志平,林俊宏,吴柏林,等.浅地表地球物理技术在岩土工程中的应用与挑战[J].地球物理学报,2015,58(8):2664-2680.LIN ZH P,LIN J H,WU B L,et al.Applications and challenges of near surface geophysics in geotechnical engineering[J].Chinese Journal of Geophysics,2015,58(8):2664-2680.
[3]葛轶洲,张小蓟,王大龙,等.基于DFT算法的地埋金属管线探测仪研究[J].电子测量与仪器学报,2013,27(10):986-991.GE Y ZH,ZHANG X J,WANG D L,et al.Research of underground metallic pipe detector based on DFT algorithm[J].Journal of Electronic Measurement and Instrument,2013,27(10):986-991.
[4]DEKDOUK B,KTISTIS C,MARSH L A,et al.Towards metal detection and identification for humanitarian demining using magnetic polarizability tensor spectroscopy[J].Measurement Science&Technology,2015,26(11):115501.
[5]SVATOS J,POSPISIL T,VEDRAL J.Advanced instrumentation for polyharmonic metal detectors[J].Journal of Physical Chemistry B,2015,52(5):1-1.
[6]王琦,崔莉莎,汪剑鸣,等.基于电磁层析成像的金属缺陷稀疏成像方法[J].仪器仪表学报,2017,38(9):2291-2298.WANG Q,CUI L SH,WANG J M,et al.Defects detection based on electromagnetic tomography for sparse imaging method[J].Chinese Journal of Scientific Instrument,2017,38(9):2291-2298.
[7]王伟,张群英,方广有.浅表层伪随机编码超宽带探地雷达研制[J].仪器仪表学报,2012,33(8):1902-1908.WANG W,ZHANG Q Y,FANG G Y.Development of pseudo random coded subsurface UWB GPR[J].Chinese Journal of Scientific Instrument,2012,33(8):1902-1908.
[8]谢维,王京彬,朱谷昌,等.线圈中心测量垂直磁场虚分量频域电磁法数值模拟[J].中南大学学报(自然科学版),2013,44(4):1444-1452.XIE W,WANG J B,ZHU G CH,et al.Numerical simulation on frequency domain electromagnetic sounding method of measuring magnetic field vertical imaginary component in center of loop[J].Journal of Central South University(Science and Technology),2013,44(4):1444-1452.
[9]周逢道,丁凯来,曾新森,等.基于阶梯波参考信号的改进型正交锁定放大[J].吉林大学学报(工学版),2016,46(3):996-1003.ZHOU F D,DING K L,ZENG X S,et al.Improved orthogonal lock-in amplification based on step wave reference signal[J].Journal of Jilin University(Engineering and Technology Edition),2016,46(3):996-1003.
[10]周逢道,韩思雨,綦振伟,等.基于FPGA+DSP的浅地表频域电磁探测数字处理系统[J].湖南大学学报(自然科学版),2016,43(10):94-101.ZHOU F D,HAN S Y,QI ZH W,et al.Digital processing system for shallow surface frequency-domain electromagnetic detection based on FPGA+DSP[J].Journal of Hunan University(Natural Sciences),2016,43(10):94-101.
[11]SVATOS J,VEDRAL J,FEXA P.Metal detector excited by frequency-swept signal[J].Metrology and Measurement Systems,2011,18(1):57-67.
[12]LOU W,SHEN C,SHENTU F,et al.High accuracy tiny crack detection in metal by low frequency electromagnetic technique[J].Journal of Physics:Conference Series,2016,680(1):012017.
[13]ZHAO Y,YIN W,KTISTIS C,et al.On the lowfrequency electromagnetic responses of in-line metal detectors to metal contaminants[J].IEEE Transactions on Instrumentation&Measurement,2014,63(12):3181-3189.
[14]王庆林.基于平衡线圈技术的金属探测器设计[D].济南:山东大学,2010.WANG Q L.Design of metal detector based on balance coil technique[D].Ji'nan:Shandong University,2010.
[15]MOCITAIBA L S R,SAMPAIO E E S,LIMA O A L D.Effect of coupling noise on the interpretation of results of electromagnetic horizontal sounding and modeling[J].Studia Geophysica Et Geodaetica,2017(61):1-25.
[16]高云泽,叶盛波,张晓娟,等.基于电磁感应和超宽带雷达的新型探测系统[J].电子测量技术,2015,38(9):128-134.GAO Y Z,YE SH B,ZHANG X J,et al.Novel detection system based on EMI and UWB[J].Electronic Measurement Technology,2015,38(9):128-134.