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New coil idea
Got a new invention idea-flash but it needs alot development first:
The coil is not directly a coil but transmitter and receiving unit
with motor located at the "coils" center.
One of the units is attached to the spinning center by a
stable plastic or glasfiber-arm with adjustable lenght !!!
RPS (rounds per second, RPM= rounds per minute) perhaps
1 to 20.
Sounds complicated but isn't!
TX-RX coil distance always will be the same like center of circle.
Of course circuit must be adjustable for different lenghts
or spoken in terms of electronic - different inductivity & S/N-ratio.
This could be achieved by reducing transmission power.
Advantages:
*
Very lightweight large coils could be created because the
distant "satellite" transmission or receiving coil unit has not
the complete diameter but only the coils weight incl. the
light but still stable plastic or fiberglas arm.
*
The detector no longer needs heavy and expensive seperate
sized coils for different tasks.
*
If the arm has the shape of a bow even high grass would be
no longer a problem.
disadvantages:
*
additional power for motor
*
EMI from motor
*
dangerous for the feets (safety-boots required)
However, this new concept is just for additional inspiration.
Motorized machines also could be built. Or devices for
scanning high walls with such a method.
Even some "helicopter-style" detector would be possible
with counter weight (or better coil) and adjustable very long
arms for extreme depths!
In that case each one of the both hanging down rotors
at their ends could be designed as a long coil.
A single person could find extremly deep large metal objects
in deserts or other flat areas with such a backpack-heli-detector.
The coil is not directly a coil but transmitter and receiving unit
with motor located at the "coils" center.
One of the units is attached to the spinning center by a
stable plastic or glasfiber-arm with adjustable lenght !!!
RPS (rounds per second, RPM= rounds per minute) perhaps
1 to 20.
Sounds complicated but isn't!
TX-RX coil distance always will be the same like center of circle.
Of course circuit must be adjustable for different lenghts
or spoken in terms of electronic - different inductivity & S/N-ratio.
This could be achieved by reducing transmission power.
Advantages:
*
Very lightweight large coils could be created because the
distant "satellite" transmission or receiving coil unit has not
the complete diameter but only the coils weight incl. the
light but still stable plastic or fiberglas arm.
*
The detector no longer needs heavy and expensive seperate
sized coils for different tasks.
*
If the arm has the shape of a bow even high grass would be
no longer a problem.
disadvantages:
*
additional power for motor
*
EMI from motor
*
dangerous for the feets (safety-boots required)
However, this new concept is just for additional inspiration.
Motorized machines also could be built. Or devices for
scanning high walls with such a method.
Even some "helicopter-style" detector would be possible
with counter weight (or better coil) and adjustable very long
arms for extreme depths!
In that case each one of the both hanging down rotors
at their ends could be designed as a long coil.
A single person could find extremly deep large metal objects
in deserts or other flat areas with such a backpack-heli-detector.
cause I don't even understand what your getting at! Your right, it does need a hell of a lot of development. That should keep you busy for a long time 
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