Vaisala launches a new visibility sensor based on forward scatter technology for Runway Visual Range (RVR) applications. Forward scatter technology is gaining ground in measurement of visibility at airports, one of the key parameters affecting aviation safety. The new Vaisala FS11 Visibility Sensor offers a number of new features that allow reliable measurement of visibility in all weather.

Forward scatters determine visibility for runway visual range (RVR) by measuring the attenuation of light in the atmosphere. The Vaisala FS11 Visibility Sensor measures the attenuation of light by transmitting a beam of light and measuring a portion of the light scattered out of the beam when it meets with fog, snow and rain.

The new Visibility Sensor utilizes a new technique to measure and automatically compensate for the attenuation effect of window contamination, which allows the sensor to maintain its measurement accuracy throughout the recommended interval between window cleanings. Moreover, this means a longer maintenance interval. The FS11 offers a measurement range of up to 75 km and meets FAA and ICAO specifications for visibility measurement in commercial aviation. For reliable operation in the harshest weather, the FS11 is equipped with high power heaters and optical path clearance monitoring mechanism.

The Vaisala Group is a successful international technology company that develops and manufactures electronic measurement systems and equipment for meteorology, environmental sciences, traffic safety and industry. Vaisala employs over 1,000 skilled professionals and achieved net sales of EUR 179.5 million in 2000. Vaisala serves customers throughout the world. In 2000, exports accounted for 96% of net sales. Vaisala's A-series shares are quoted on the Helsinki Exchanges (HEX).