"K" Probe

The Original Kaimal Orthogonal Probe. Engineered primarily for boundary layer studies.

"Sx" Probe

Measure the same volume of air horizontally with a separate vertical axis. Ideal for environmental monitoring applications

"Vx" Probe

Orthogonal probe to measure a single volume of air. Designed for turbulent flux measurements in canopies.

"Vxsp" Probe

Full circle version of the "Vx" Orthogonal probe to measure a single volume of air. Designed for turbulent flux measurements in canopies.

"V" Probe

10 cm orthogonal probe which measures a single volume of air. Perfect for turbulence where the eddy measurement must be the smallest.

"A" Probe

Non-orthogonal design for high range of velocity. Has the same accuracy as our orthogonal probes. No obstruction in the vertical axis.

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Orthogonal and Non-Orthogonal Scientific Ultrasonic Anemometers

Since 1976 we have provided the only true, orthogonal scientific ultrasonic anemometers based on the design of Dr. Jagadish Chandran Kaimal.  The Applied Technologies, Inc. Ultrasonic Anemometer incorporates state-of-the-art microprocessor and surface mount technologies. Software that computes the wind speed, wind direction and sonic temperature has been enhanced and optimized to provide a rapid response ultrasonic anemometer/thermometer. 

The calibration of the sensor is established by its design parameters, therefore it can be used as an absolute wind instrument.
That is correct, an Absolute Wind Instrument, with an accuracy that is controlled by the operator.

The electronics that operate the Sonic Anemometer are located inside the probe array. Typically, the Sonic Anemometer/Thermometer is DC powered, however other power options are available by either external adapters or by contacting the factory. The Sonic Anemometer/Thermometer is usually connected to a computer running a terminal emulation program or can be connected directly to a dumb terminal. The Applied Technologies, Inc. Ultrasonic Anemometer is a stable, low-powered anemometer, capable of running unattended for extended periods of time.

The system may include a single, double, or triple axis probe array, along with several other novel probe array designs. These designs reduce errors from both flow asymmetry and interference from structural members.

The system detects wind speed components along mutually orthogonal acoustic paths, computes the wind velocity and provides an output directly in engineering units. The probe array designs of the Applied Technologies, Inc. Sonic Anemometer/Thermometer are the only TRUE orthogonal ultrasonic anemometer and provides a true vertical velocity measurement. The "W" component is not inferred or calculated from some other measurement but is a direct measurement that has an alignment accuracy of better than ±0.1°.

The system also provides calculations necessary to compute the sonic temperature, (in the "W" path), corrected for velocity contamination. It provides these data with excellent frequency response and makes it ideal for many aspects of basic atmospheric research, along with any requirement for a very accurate temperature.

These instruments have been established for use in Eddy Covariance work, which includes Momentum Fluxes, Latent Heat Fluxes and Sensible Heat Fluxes. This is an atmospheric measurement technique used to calculate vertical turbulent fluxes within atmospheric boundary layers.

We also manufacture a non-orthogonal probe array that has the same accuracy and resolution as our orthogonal probes.  The "W" path is open with no obstructions to cause vertical velocity errors.

Here's a short 2 min. video about our "K" Style Sonic Anemometer

Other Products from Applied Technologies, Inc.

DataPacker/
DataLogger

Combine and Log Data from multiple devices

Temperature Probe

High-Speed & High Accuracy Temperature Probe

The Perfect Fit for Your Unique Application

ATI Ultrasonic Anemometers are ideal for capturing accurate flux measurements, latent heat flux, sensible heat flux, momentum flux, eddy covariance method, eddy correlation, eddy flux, atmospheric research, meteorological research, ecosystem carbon, surface energy balance, sonic thermometry, carbon sequestration monitoring, and more. Additional details on all our Ultrasonic Anemometers is here.

Custom Design Work Available

Our research and development department can also do custom-designed work should you need an instrument or system because the off-the-shelf Ultrasonic Anemometers do not physically fit your application. We work collaboratively with our customers to develop meteorological instruments and systems that meet their exact requirements.  Visit our Custom Designs page for more information.

Understanding Probe Geometry

Researchers have discovered that non-orthogonal sonic anemometers can underestimate vertical wind component and heat flux by as much as 15%. Learn how coordinate transformation works and its impact on sensor accuracy.  Learn More about probe geometry...