For everyone who wants build a LRL's works

[Nicolas]

Hi all and for all skeptics

How to make a the ultimate metal detector! (detects a truck at 500m)

Apparently you can do this! And the key is to be able to measure
extremely small changes in magnetic field density while at the same
time nulling out the earth's magnetic field.

There is some complex maths in there and I don;t expect you'll be
making this on the bench at all but it is an interesting design that
shows how it is possible to use lasers and magnetstrictive material
to create a very sensitive magnetic field detector
Device in sight!

The motivation for the design is military and as it says in the text
just about the only thing you can never hide (camouflage) or jam (radar)
is the fact that military equipment is made of metal.
that now, when you think of printable plastic guns.

The idea is that you can always detect metal whether it is underwater
or hidden on the ground and by flying this unit over the terrain you
can detect them.