This paper has described the principle and method of using the dual frequency instrument to solve the problem of hydraulic connection for water leakage in wells and adits. Characterized by strong anti-interference capacity, high resolution ratio and portability of the instrument, the dual frequency gradient method has proved effective in practice.
张宗岭. 双频梯度测量探查井巷漏水水力联系[J]. 物探与化探, 1996, 20(5): 374-377,383.
Zhang Zhongling. THE APPLICATION OF DUAL FREQUENCY GRADIENT SURVEY TO THE DETECTION OF HYDRAULIC CONNECTION FOR WATER LEAKAGE IN WELLS AND ADITS. Geophysical and Geochemical Exploration, 1996, 20(5): 374-377,383.