Rb atoms are cooled down inside a vacuum chamber using lasers
At close to 0 K, the wave nature of atoms becomes apparent
Interference of these matter waves is contingent on gravity
overcomes
Conventional Gravimeters - Relative gravimeters like the CG-5/CG-6 work by comparing the extension of a spring, to which a mass is attached, to a base station. Since springs do not retain their length over a long period of time, there is drift in the measurements and the device needs to be frequently calibrated.
Ground Penetrating Radar (GPR) - Works by emitting radio waves into the ground and detecting the reflections. These signals attenuate in the ground by being absorbed or reflected away and thus, the signal cannot penetrate greater depths than 2 m in the real world. Using a lower frequency signal improves depth capabilities but at the cost of resolution.
Trial Trenching - Involves excavation work to establish the location, size, and orientation of underground utilities.
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