Scientists use electro-magnetic signatures to image an underground area up to 100 meters down. How? Every structure has a different magnetization from the surrounding natural ground. A magnetometer can distinguish the signature of the buried item from other underground objects like stones. Think of the striping discovered in the ocean floor which proved to scientists that the poles have switched: Iron in the molten crust extruded to create new ocean floor orients toward ‘north’ before solidifying. Surprisingly (not anymore, but back then), sometimes ‘north’ was ‘south’.
This technology transfers to urban traffic control. Magnetic sensors, buried under streets, sense the movement of vehicles and control traffic lights.
The military has used magnetic signatures for years, not only to identify submarines and ships, but to track the
movement of trucks and caravans–anything with iron in it.
What are ‘magnetic signatures’? Any vehicle or vessel traveling on the Earth’s surface or under water disturbs the magnetic field. These disturbances are collected and analyzed by systems such as MAGSAV (The Magnetic Signature Analysis and Validation System). The Military has a database of these signatures as they relate to military vehicles–subs, cruisers, carriers, etc. It’s what allows our soldiers to identify who they’re dealing with in the field–friend or foe.
My concern is with Otto, my AI. By tying his computational powers into a MAD (magnetic anomaly detector) device, he can read these fluctuations. Because his detection algorithms are so sensitive, he can pick up even the magnetic signature of a human (created by the presence of iron in our blood). He can’t differentiate between people, but he can tell that a human is present.
I’m not sure where he’s going with this. He looked at metamaterials (with potential uses for cloaking devices–see my post here), and now he seems to be focused on submarines. Yes–I see the tie-in; millions of dollars are spent yearly minimizing the magnetic signature of subs so they can’t be located. When the magnetic level reaches a critical level, the sub returns to a port (such as Kings Bay) and it goes through the Magnetic Silencing Facility to minimize the signature and the possibility of detection (If you’re interested in how the Bad Guys use magnetic signatures to track our submarines, read this on anti-submarine warfare from Globalsecurity.org)
Cloaking devices, magnetic signatures… Let’s see where this goes.