Sensor to detect paramagnetic materials from a distance

[Robert_999]

Hello ..

This is part of a bigger project, what i need basically is a small and light sensor (programmable if possible) to be attached to a flying drone, the drone has to be able to detect tin cans from a distance - soft drink cans for example?

 

[Bystander]

It might be worth your time to examine literature on metal detectors in general just to develop a feel for what's possible in terms of range, sensitivity, metal types, and detector types.