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21
Null Mode
When horizontal magnetic field through the horizontal antenna is generated induced
current in the coil, the size of the induced current with magnetic field through the
horizontal antenna how many (flux), only when the cable is directly above through the
magnetic field of horizontal antenna is the most largest (magnetic flux), both receiver
measured signal is the strongest. As shown in the figure:
The wave peak method is suitable for path detection, depth testing, fault prediction,
etc.
(2) Trough law (trough)
In a particular signal transmission cable, measured signal receiver is weakest, about
mobile receiver on the same plane to signal will increase immediately, in contrast to
the wave crest, so named trough method. In fact, it USES a vertical antenna in the
receiver to detect magnetic field signals.
When the vertical magnetic field through the vertical antenna is generated induced
current in the coil, the size of the induced current with magnetic field through the
vertical antenna how many (flux), only when cable is directly above or away from the
cable through the magnetic field is vertical antenna at least minimum (flux), both
receiver measured signal is the weakest.
Because the signals on the top of the cable and away from the cable are weak, the
trough method is designed to indicate the direction of orientation. Suitable for path
validation and depth of 45 °.