Abstract
Magnetic Signal Transmitting Method (MST) aims at transmitting the information of underground by radio to work efficiently in drilling work, investigating the nature of the soil.
MST is a system that makes used of its own boring rod for signal transmitting.
A concept of MST is the same of a transformer, but it needs the original analysis method, because its flux path is very long, structure is open flux path, and receiving side makes used of magnetic characteristics of low magnetic field.
In the present paper, we explained the fundamental structure of MST and the experimental model, and led an experimental expression of output voltage in receiving coil. Deciding the parameter of the experimental expression, we measured relative permeability in low magnetic field and considered an influence by the depth of penetration of magnetic flux. Moreover we measured the output voltage of receiving coil, verified the experimental expression, and searched the theoretical expression of transmitting distance to calculate the transmitting distance out of experimental expression, and then searched the signal transmitting distance when it applied to boring rod.
