Signal lamps Optical communication

an air traffic controller holding signal light gun can used direct aircraft experiencing radio failure (2007).

signal lamps (such aldis lamps), visual signaling devices optical communication (typically using morse code). modern signal lamps focused lamp can produce pulse of light. in large versions pulse achieved opening , closing shutters mounted in front of lamp, either via manually operated pressure switch or, in later versions, automatically.

with hand held lamps, concave mirror tilted trigger focus light pulses. lamps equipped form of optical sight, , commonly deployed on naval vessels , used in airport control towers coded aviation light signals.

aviation light signals used in case of radio failure, aircraft not equipped radio, or in case of hearing-impaired pilot. air traffic controlers have long used signal light guns direct such aircraft. light gun s lamp has focused bright beam capable of emitting 3 different colors: red, white , green. these colors may flashing or steady, , provide different instructions aircraft in flight or on ground (for example, cleared land or cleared takeoff ). pilots can acknowledge instructions wiggling plane s wings, moving ailerons if on ground, or flashing landing or navigation lights during night time. 12 simple standardized instructions directed @ aircraft using signal light guns system not utilized morse code.