The Vaisala LT31 Transmissometer, is operational at Masdar Field Station since November 2019 and provides high accuracy measurements of ground-level visibility with a temporal resolution of 10 seconds. Visibility indicates the distance to which human visual perception is limited by atmospheric conditions. Transmissometers are instruments which derive visibility by measuring the light transmittance of the atmosphere.
The LT31 incorporates a white LED as a light source. White light is needed for the best accuracy in transmittance measurement.
Fig 5: Vaisala LT31 Transmissometer.