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铁道科学与工程学报

JOURNAL OF RAILWAY SCIENCE AND ENGINEERING

Vol. 5    No. 4    December 1995

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NONLINEAR EFFECT OF THE DUALFREQUENCY IP SPECTRUM
He Jishan; Li Daqing; Tang Jingtian

Department of Geology; Central South University of Technology; Changsha 410083

Abstract:Experiments were carried out on more than fourty various mineral specimen with the dual-frequency IP instruments in a closed condition and a 3-D water tank to study the nonlinear effect of the dual-frequency IP spectrum.The comparison of experimental and theoretical analysis results showed that the sawtooth feature will be appeared on the dual-frequency IP spectral curves when the induced current density is increased to a certain value,and the feature is different for different minerals.Based on this feature,it is possible to develop a new geopgysical method to evaluate the IP anomalies using the dual-frequency IP method.

 

Key words: nonlinear effect; spectral curves; sawtooth feature; dualfrequency IP method

ISSN 1672-7029
CN 43-1423/U

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