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Most airports now rely on automated weather systems that include a "forward scatter sensor." This instrument produces pulsed flashes of blue light, some of which is scattered at an angle toward a nearby detector. Visibility is estimated from the intensity of scattered light, which increases when there are more fog droplets, smoke or haze particles, raindrops or snowflakes in the beam.

A second device is a transmissometer, which allows a more direct approach as it measures the capacity of a portion of the atmosphere to transmit radiation.

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14y ago

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