FIELD: means of ensuring safety; physics.
SUBSTANCE: during evacuation of a vehicle, temporal and amplitude variations of the magnetic field are continuously recorded, they are compared every 5–10 s with reference dependencies of the magnetic field changes that are characteristic of the fields created by a boom of a tow truck, and when the dynamics of the magnetic field coincide with the reference one, a signal about the beginning of evacuation is sent. Device for signaling about vehicle evacuation is also offered.
EFFECT: it is possible to create a high-speed, highly selective "evacuation" salon alarm system.
1 cl, 2 dwg
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