Lufft has developed the Marwis weather-sensor detecting road and runway conditions. It comes optionally with CAN connectivity.
The road weather sensor can be installed on vehicles with a distance of 1 m to 2 m above the surface and delivers information about temperatures, waterfilm heights, dew points, road conditions (dry, moist, wet, snow, ice), ice percentages, relative humidity, and friction with a frequency of up to 100 times per second. It serves as an decision support with regard to preventive gritting. Due to the optional CAN interface protocols, they can be integrated into existing winter maintenance monitoring networks. Similarly, the road sensor can communicate directly with the control system on gritting vehicles. A standardized CANopen profile would simplify the integration into heavy-duty vehicles and open networks such as CiA 447 (profile for special-purpose cars).
The product uses optical LED transmitters, photo receivers, pyrometer, and infrared sensors to measure the above-mentioned weather values. Typical application examples include decision support for winter maintenance operators on roads, motorways, and highways (municipalities, federal states and provinces) as well as for the de-icing of runways (higher efficiency). As important part of the IDS (Ice Detection System) in form of a RCC (Runway Condition Code), water film height (aqua-planning risk) and friction detector on airports (digital alternative to mechanic grip testers) are used.