Atomic Dielectric Resonance (ADR) , , is a patented investigative technique (US 6864826 B1) that can image inside materials (e.g. underground) and classify the materials being imaged. It does this by measuring and interpreting resonant energy responses of natural or synthetic materials while these interact with pulsed electromagnetic radio waves, microwaves, millimetric or sub-millimetric radio waves being passed through them.