Transmissometer
A transmissometer is an instrument used to measure the horizontal visibility at an airport or in flight. It works by emitting a beam of light and measuring the amount of light that is scattered or absorbed by the atmosphere. This measurement is then used to calculate the visibility in meters or miles. Transmissometers are commonly used in aviation to determine if the visibility is above the minimum required for takeoff and landing. They are also used to monitor visibility during flight and to provide pilots with real-time information about the visibility conditions ahead.
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