Warning system

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There are 8'200 alarm sirens for civil protection throughout Switzerland. They are tested once a year, on the first Wednesday in February.[1] About this sound Sound sample 
Warning light indicating danger of laser exposure

Warning system is any system of biological or technical nature deployed by an individual or group to inform of a future danger. Its purpose is to enable the deployer of the warning system to prepare for the danger and act accordingly to mitigate or avoid it.

Biological warning systems[edit]

Man-made warning systems[edit]

Civilian warning systems[edit]

A fire alarm that warns people if a building is on fire

Military warning systems[edit]

Historical beacon-based systems:

Space based missile early warning systems:

Airborne early warning systems:

Ground based early warning radar systems:

Optical sensors:

Emergency broadcasting:

See also[edit]

Notes and references[edit]

  1. ^ Testing sirens, Swiss Federal Office for Civil Protection (page visited on 7 September 2013).
  2. ^ [1][dead link]