Interesting use of technology I thought.
Saper is the Polish term for minesweeper and, at the same time, an acronym for Sensor Amplified Perception For Explosives Recognition. The aptly named application uses the magnetometer - normally responsible for your phones compass-like functionality - to detect minute disturbances in the magnetic field around an explosive material. Forty different kinds of explosive materials can be sniffed out from 30 cm (11.8 inches) away.Before the suspected area can be inspected, the application, which has been successfully field tested, needs a short while to calibrate to the environment. Once thats done, all you need to do is wave the phone in the air as if painting a grid measuring a maximum of 30 cm by 30 cm, no further than 30 cm away from the potential threat source (the distance can be increased with an outstretched arm - or with a stick, for that matter).The app connects to a cloud-based server and compares the recorded magnetic disturbance signature with other signatures in the database. If a threat is detected, the app returns a warning message and identifies the likelihood of there being a certain type of explosive material in the sampled area. GPS connectivity is used to pinpoint the site and to immediately alert the authorities