J.Feldhaar wrote:
>
> Hello Roman,
>
> these detectors are based on the magnetical ur of metals, altering the
> osc frequency of the device. The beeping is the mixed signal of the ref
> and the coil oscillators...
>
> Greets Jochen
> (I'm sure happy I haven't been removed - although I was told so...)
>
> Roman Black schrieb:
>
> > Just a quick question, are "security" type metal
> > detectors sensitive to carbon fibre? Or any other
> > dense non-metal substances? :o)
> > -Roman


Thanks Jochen, but it doesn't answer my question.
I have built a couple of metal detectors over the
years (and even some circuits that were sensitive
to metal when they were not supposed to be!) and
I know they will detect other things such as water,
especially if it conducts electricity and will
produce some type of inductance.

I would like to know specifically with "door frame"
type metal detectors if they will pick up carbon
fibre. I don't even know how conductive most
carbon fibre composites are. If no-one knows about
the metal detector, I might have to trot down
to the local airport with some samples! ;o)
-Roman

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