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波兰Farmas等人研制了一种用来测定地下钻孔(通风用、联络用)孔底空间位置的仪器,以便及时纠正钻孔的方向。此仪器包括一个带有电磁波发射装置的钻孔探测器及若干个用铁氧体天线的接受器。发射的电磁波有两种频率——295及305千
Poland Farmas et al. developed an instrument for determining the position of the hole in the underground borehole (ventilation and communication) in order to promptly correct the direction of the borehole. The instrument includes a borehole detector with an electromagnetic wave launcher and a number of ferrite antenna receivers. The emitted electromagnetic waves have two frequencies - 295 and 305 thousand