Older technologies which use analog methods suffer from drift with time. Our technology is all digital, so there is no drift. Our design eliminates the traditional wind vane and associated encoder from the sensor system. The single Rotorvane sensor is of the general form of a conventional cup anemometer but the rotor is made aerodynamically asymmetric so that its speed varies throughout each rotation in a manner which depends on wind direction. Wind direction is determined from the variations in rotor speed.
Wind speed is determined in the traditional way from mean rotor speed.
This technology is currently used in the RayMarine ST40 wind instrument. RayMarine has an exclusive licence for its use in products for the marine leisure industry. Additional licencees for other market areas are sought. We supply short form Kits for a DIY Rotorvane Anemometer which has LED dials, a serial port from which data can be read, and an integrated data logger suitable for wind power site assessment.