Product Overview:

The Vaisala CL51 altimeter is capable of measuring high-altitude cirrus clouds or vertical visibility under adverse weather conditions through low and hollow cloud layers.

CL51 uses pulsed diode laser LIDAR (Laser Detection and Ranging) technology to emit short, powerful laser pulses in a vertical or nearly vertical direction. The laser reflection (backscattering) caused by clouds, precipitation, or other light shielding objects can be used to analyze and determine the height of the cloud base.

The CL51 model is designed specifically for analyzing the height profile of high-altitude cumulus clouds, and can also provide detailed data and vertical visibility of mid to low level clouds. Its detection range can reach 15 kilometers.

• Measurement starts from the ground

The enhanced single lens technology used in CL51 ensures outstanding performance from absolute zero height measurement onwards. This is due to the strong and stable signal it obtains throughout the entire range. CL51 can simultaneously detect three cloud layers. If the cloud base is obstructed by precipitation or ground fog, it can also measure vertical visibility. CL51 can provide a full range backscatter profile, which provides the possibility for further boundary layer and atmospheric analysis.

• Specially designed for harsh weather conditions

The CL51 has a protective cover with a window blower and heater, which ensures smooth operation even in precipitation and extreme temperatures. Optical filters provide it with sun protection. The tilted protective cover further shields it from the effects of precipitation and ice crystal mirror reflection. The tilt angle can be automatically adjusted.

Performance advantages:

▪ Cloud detection range up to 13 kilometers (43000 feet)

▪ The second-generation advanced single lens optical components have the same performance in low altitude detection

▪ Modular design,

Easy to install and maintain

▪ Reliable operation in all weather conditions: unparalleled performance under precipitation conditions

▪ Detecting cirrus clouds

▪ The backscatter profile covers the entire distance up to 15 kilometers

▪ Practical verification shows that it can operate automatically 24/7 under all weather conditions

▪ Rich self diagnostic program with fault analysis capability

▪ Based on solid and low-cost laser diode technology

▪ * * * * from the world's leading manufacturer, based on over 5000 Vaisala cloud altimeters installed around the world.