Analysis and numerical removing of distortion in transient electromagnetic receiver device for shallow sounding
瞬变电磁接收装置对浅层探测的畸变分析与数值剔除

Frequency characteristic of transient electromagnetic receiver device is analyzed in theory,thus the reasons of distortion in early-time are given.The effect of receiver device on primary field and secondary field is proposed.The relationship between the minimum sampling time and resonance frequency of receiver device based on conductor sphere model is illustrated;the effect of receiver device on shallow subsurface sounding is discussed.during and after the turn-off of transmitting current.If the resonance frequency and position of receiver device is known when the all-time transient responses and transmitting current are recorded as soon as transmitting current begin to shut off,the effect of receiver device can be removed by using numerical method.Even though the transition process of receiver device,the shallow subsurface sounding can be realized,the blind zone can be reduced and the sounding resolution and precision can be enhanced.