Abstract. In this note we reassess the role of sonic thermometry in boundary-layer studies. The sonic temperature signal, when corrected for crosswind velocity contamination, very closely approximates the virtual temperature of air. This variable is needed for many boundary-layer calculations. We describe preliminary tests with a new sonic anemometer-thermometer that performs the velocity correction in real time. Our test results offer new insights into the nature of the velocity error on temperature standard deviations and fluxes. They also draw attention to the high noise threshold that appears as an f+1- rise in the fS(f) spectrum when spectral levels drop below 10-4°C2.
Mechanical vs. Ultrasonic Anemometers for Wind Turbine Control
What do you think? Does the replacement of mechanical wind sensors trough ultrasonic anemometers in wind turbine control pay off after less than a few years? Free Cost Benefit Analysis about Replacement of Mechanical Wind Sensors Anemometers are vital components of utility-scale wind turbines and determine the performance of the turbine’s output.In the market today, companies are transitioning to ultrasonic anemometers. These sensors contain no moving parts and are entirely electric, which reduces...
Case study - Barnsley Council
As part of their commitment to improving the energy efficiency of all homes and buildings within their borough, Barnsley Council contacted Logic Energy to see if they could assist Dearne Carrfield Primary School in discovering their “green potential” before investing in a renewable energy system. With solar thermal systems, wind, solar PV and biomass systems all an option, the school wanted a monitoring system that would measure various meteorological sensors to help them to decide on the most...
What are the advantages of ultrasonic wind sensors?
Whether mechanical, ultrasonic or laser wind measurements: All measuring methods have technical limits. While for mechanical wind sensors the measuring element – cups and vanes – itself predominantly produces a disturbance in the flow field, for ultrasonic anemometers a disturbance can be caused by the sensor holder or housing construction. Only optical methods, e.g. LDA (Laser Doppler Anemometer), enable a disturbance-free measurement of wind speeds. However, for this particles are required and such...
Introducing The RNRG Goalpost Boom
We are happy to introduce a new goalpost mounting solution for installing redundant class 1 anemometers. This new boom, designed specifically for use with our 80m XHD TallTower, positions anemometer cups at exactly 80 m above ground level—2.5 m away from each other—and 1.99 m above the horizontal arm of the boom. This configuration complies with guidelines provided in Annex G of the IEC 61400-12-1:2005 standard when installed on a RNRG 80m XHD TallTower—a solution that is well-suited for conductin...
Metek Introduces the New Multi-Path Ultrasonic Anemometers
Our news report about recent instrumentations or measurements of our customers which might be of special interest for other web site visitors. The reports are added on the fly whenever we have received such information. The experienced support is highly welcome and appreciated. Metek is proud to present the new members of the uSonic-family: The ultrasonic anemometers uSonic-3 Class A MP and uSonic-3 Cage MP represent an innovative step forward to highest performance in atmospheric turbulence sounding. Based on...