【摘要】 EH-4连续电导率成像系统是新一代数字化的电磁法仪器。分析了EH-4观测信号经离散傅里叶变换后,不同频率时长的傅立叶变换不可避免地产生信号频谱泄露。在分析和理解窗口函数特点及其作用的基础上,结合堤坝渗漏探测中对信号的分析与处理,确定了堤坝渗漏的空间位置,为帷幕灌浆提供了科学依据。更多还原

【Abstract】 Continuous conductivity imaging system of EH-4 is the updated numeric instrument with electromagnetic method.This paper analyzes the spectral leak problem of EH-4 system after Fourier transform of signals under different frequency.On the base of analyzing and understanding the characteristics and function of different window functions,combined with the analysis and interpretation on the signals during the detection of dam leak,the spatial locations of dam seepage are determined,which provides the scientific proof on purdah grouting.更多还原