metal detector jammer

terminatorboy2020 said:

hi
i have a question and would appreciate any idea about it.
i know that metal detectors work by sending out radio frequency signals and listen for reflected signals.
in my country some thieves are using metal detectors to break into someone house and steal just the Jewellery in matter of minutes.
i was a victim of such crimes a few years back.
i want to know if it's possible to built a jammer that disrupts the metal detectors and make them unable to find any gold.
i have come to understand that just wrapping your gold with another metal like aluminium is not gonna be effective. is that right?
i searched the internet and there was nothing about this on net that i could buy.
thanks in advance
waiting for your answer

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gophert said:

I convert all of my jewelry to cash and cash cannot be detected by metal detectors.

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Nigel Goodwin said:

Coins can!

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rjenkinsgb said:

You cannot stop a metal detector detecting metals. But, you can make it useless for finding jewelry:

Put good size pieces of aluminium foil or shorted loops of copper wire on every shelf & in the base of every drawer etc., so no one stands out from the rest!

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gophert said:

I convert all of my jewelry to cash and cash cannot be detected by metal detectors.

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terminatorboy2020 said:

so your wife goes around in weddings and other ceremonies with cash around her neck?

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terminatorboy2020 said:

thanks for your input but i'm afraid it's useless since a house is already full of metals and metal detectors can find the gold despise that . i think they can tell between aluminium and copper and gold

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rjenkinsgb said:

Metal detectors can discriminate between ferrous and non-ferrous easily.

They cannot easily tell apart non ferrous metals, especially those with similar conductivity and similar mass.
Gold and aluminium are similar, likewise copper and silver.

The cheaper metals have slightly lower conductivity so need to be slightly larger mass to give a similar reading to the expensive ones - so eg. reasonable size copper and aluminium washers should give the same results as silver or gold rings.

Having done a bit more technical research since my last answer, sheet aluminium foil would not work well as it will not retain an induced current for long - but metal washers should be ideal.
eg.
**broken link removed**

Pieces of copper or aluminium sheet metal would also work to confuse things.

This is a small extract from a very long technical article on metal detector technology:
View attachment 126960

As you can see, the detection effects are as much from the mass as from the metal type.

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