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Degreane - Model DF320 -Visibility Sensor
The DF320 visibility sensor uses forward scattering to measure visibility. It is used to measure synoptic visibility (Meteorological Optical Range) up to 70 km) and aeronautical visibility. Used in combination with a LU320 luminancemeter, it provides Runway Visual Range (RVR) and Aeronautical Visibility (AV).
The forward scatter sensor DF320 is a sensor designed for visibility measurements. DF320 consists of a white light source and a
receiver placed off axis from the source.
The intersection of the source`s and receiver`s visual fields defines the analysis volume. The suspended particles in this volume scatter the light in all directions.
The intersection of the source`s and receiver`s visual fields defines the analysis volume. The suspended particles in this volume scatter the light in all directions.
It delivers accurate and tracable values over a wide range (up to 70 Km) of measurements, even in harsh weather conditions. Associated with a luminancemeter, it is suitable built for aeronautical meteorological purposes (Runway Visual Range-RVR, and Aeronautic visibility-AV, as defined by ICAO standards).
It also can be used for other application such as synoptic meteorology, road or harbor.
To perfectly meet measurement height as requested in ICAO rules, the DF320 uses a 4 meters frangible tilting mast with adjustable measurement heads height.
The meteorological optical range (MOR) is determined using the flux measurement of the forward scattered light. Low sensibility depending on the causes of the reduction of the visibility (fog, rain, snow hail) is obtained by a low frequency modulation of a spread spectra light in a large volume, avoiding all scintillation effects.