anemometers Articles

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Flow measurement technology comparison: GA5000 Vs Hot Wire Anemometer

by Geotech  (Jul. 22, 2014)

A typical landfill or contaminated land site under investigation will comprise of a suitable number of gas monitoring wells, with a planned series of monitoring visits.  The monitoring will include gas flow measurements, which together with methane and carbon dioxide concentrations will be used to calculate gas screening values (GSV) and ...

Why Does the Non-Orthogonal Sonic Anemometer Underestimate

by Applied Technologies, Inc. (ATI)  (May 16, 2014)

The performance of non-orthogonal sonic anemometers has been the subject of much discussion in recent years.  It followed findings that they underestimated vertical winds and vertical heat fluxes by 10-15%.  For agricultural and forestry scientists who depended on them for their large-scale energy balance studies this was a bad surprise. ...

A preliminary analysis of measurements from a near-field pollutants dispersion campaign in a stratified surface layer

by Inderscience Publishers  (Dec. 1, 2014)

In order to study pollutants dispersion in a stably stratified surface layer at small scales, a pollutants dispersion field experiment programme is being conducted on the site SIRTA in the southern suburb of Paris. In a preliminary campaign held during the winter of 2012 with continuous gas releases, we had 12 ultrasonic anemometers measuring ...

Dynamic validated model of a DFIG wind turbine

by Inderscience Publishers  (Oct. 24, 2014)

This paper presents the development and qualitative validation of a doubly-fed induction generator (DFIG) wind turbine model that is represented in terms of behaviour equations of each of the subsystems, mainly the turbine rotor, the drive train, the induction generator, the power converters and associated control systems and a protection system. ...

The C3—an alternative anemometer for resource assessment

by Second Wind  (Oct. 1, 2007)

Executive Summary. Second Wind Inc. is pleased to offer a new standard anemometer for resource assessment that incorporates industry proven geometry and features. The new three-cup anemometer, the Second Wind Model C3, is physically similar to a popular anemometer designed by Maximum, Inc. and used in the wind industry for more than 30 years. ...

Comparisons of models with data: effects of averaging time as indicated by sonic anemometer measurements

by Inderscience Publishers  (Sep. 17, 2009)

For continuous sources, plots of predicted against observed gas concentrations often display considerable scatter. These differences are apparent even when the averaging times for the models and data match. Possible sources of error in the observations are shifts in direction of the mean wind or disturbance by intermediate- and large-scale eddies. ...

Verification of wind energy related measurements with a SODAR system

by Atmospheric Systems Corporation (ASC)  (Sep. 14, 2013)

Abstract Complex terrain and growing wind energy converters (WEC) in wind parks generate increasing interest in determining wind profiles and turbulence besides the general forecast of annual energy production. Increasing hub heights and growing rotor diameters of advanced WEC make SODAR systems a valuable alternative to meteorological towers. ...

Sonic Thermometry

by Applied Technologies, Inc. (ATI)  (Sep. 1, 2012)

Sonic anemometers have had extensive use in the scientific community. These instruments are used to measure atmospheric parameters that most rotating instruments cannot. Wind speed and wind direction or individual axes of wind velocity are most commonly measured. Along with these measurements, another parameter can be extracted from the sonic ...

Estimates of lateral dispersion parameters in low wind speed conditions

by Inderscience Publishers  (Dec. 28, 2012)

Wind speed time series recorded during stable low wind speed conditions are typically non–stationary, with large horizontal oscillations, commonly known as meandering. In this paper, two wavelet–based methods are proposed to obtain lateral dispersion coefficients from such time series. These methods, associated with a specific wind model, have ...

A simple methodology for surface layer characterization during diabatic extremes

by Applied Technologies, Inc. (ATI)  (Mar. 8, 2013)

Increased global environmental awareness has fostered widespread use of remote automated weather station (RAWS) networks to monitor meteorological conditions, and reliance on atmospheric dispersion modeling for decisions concerning pollutant dispersion. Dispersion models require as input a characterization of surface layer (SL) heat and momentum ...

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