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建立了以标定环为目标体的地面TEM系统标定模型,计算并分析了影响标定环响应(TLR)准确获取的七种非期望响应.研究结果表明,一次场响应(TR)和大地响应(TER、TRER)影响最大,可以通过背景场剔除方法加以剔除.接收线圈与标定环之间的高次互感响应TRLR、大地与标定环之间互感响应TELR幅度均超过标定环响应一个数量级,严重影响标定环早期响应的准确获取.通过调整标定环的直径、标定环与接收线圈之间垂直距离、标定环时间常数,可以有效地抑制TRLR的影响;通过合理配置标定环时间常数并选择高阻大地进行标定,可以有效抑制TELR的影响.本文的研究对准确标定、评价以及优化地面TEM接收系统具有指导意义.
A calibration model of terrestrial TEM system with a calibration loop as target is established and seven unwanted responses that affect accurate acquisition of calibration loop response (TLR) are calculated and analyzed.The results show that the response of one field response (TR) and terrestrial response , TRER) can be removed by background field rejection method High mutual inductance between receiving coil and calibration ring Response TRLR, mutual inductance between earth and calibration ring Response TELR amplitudes exceed the calibration ring response an order of magnitude, seriously affecting the calibration The accurate acquisition of ring early response can be effectively controlled by adjusting the diameter of the calibration loop, the vertical distance between the calibration loop and the receiving loop, and the calibration of the loop time constant. By reasonably configuring the calibration time constant and selecting the high resistance ground Calibration can effectively suppress the influence of TELR.The research in this paper is instructive for the accurate calibration, evaluation and optimization of terrestrial TEM receiving system.