anemometer Articles

49 Results found

Current filtering criteria

You can remove a filter by clicking on the x
  • Keyword: anemometer ×

The C3—an alternative anemometer for resource assessment

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. ...

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. ...

Minimizing flow distortion errors in a sonic anemometer

by Applied Technologies, Inc. (ATI)  (Mar. 20, 1990)

This paper describes a simple approach to minimizing probe-induced flow distortion errors in a three-axis sonic anemometer. By separating the three axes, mutual interference between the transducers and supports in the three arrays is reduced. Only a transducer shadow correction determined from wind tunnel tests is needed to obtain measurements ...

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. ...

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 ...

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 ...

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. ...

Canarina DISPER software · anaerobic digestion · commands 28

by Canarina Environmental Software  (Dec. 14, 2011)

The necessary data in the Meteorology command is:   Pasquill stability): Classification scheme that describes the degree of atmospheric turbulence. Categories range from extremely unstable (A=1) to extremely stable (F=6). Unstable conditions ...

Effects of averaging time on predicted gas concentrations

by Inderscience Publishers  (Jan. 26, 2004)

The potential consequences of a particular gaseous emission usually relate to a specific averaging time. However, the averaging time associated with gas monitoring data in the region of a discharge may differ from the averaging time implicit in a model employed to predict the concentration resulting from that emission. Tables of factors exist for ...

High-resolution wind-tunnel datasets from the University of Hamburg: validation of street canyon dispersion models

by Inderscience Publishers  (Jan. 26, 2004)

Air quality is one of the major environmental concerns in cities as it has a direct impact on human health. One of the biggest sources of air pollution is urban traffic. To predict air quality in urban areas, significant effort and considerable funding has been, and is being, spent in developing numerical models for urban dispersion and in ...

Basic tests for checking validity of field data

by Applied Technologies, Inc. (ATI)  (Dec. 1, 1990)

The following guidelines are suggested for verifying micrometeorological data gathered in field experiments. It is assumed, for simplicity, that the observations being tested are made over open, relatively flat and uniform terrain, with small roughness elements. It is also assumed that the sensors and the data acquisition and recording hardware ...

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 ...

Do you need to measure air flow?

by ATP Instrumentation Ltd  (Sep. 19, 2012)

Look no further. This hot wire thermo-anemometer is ideal for low air velocity, volume, and temperature measurement. If your desired application involves ventilation surveying, the maintenance of air conditioning systems, or environmental monitoring, this product will meet your requirements and more. Record your measurements on a slim plug-in ...

Intrinsically safe ultrasonic wind sensor

by Gill Instruments Limited  (Dec. 2, 2009)

The Gill Instruments Intrinsically Safe WindObserver™ is an ultrasonic wind sensor, developed specifically for use in hazardous areas and in particular for offshore applications. The sensor has no moving parts, utilising Gill Instruments’ advanced ultrasonic measurement technology to accurately monitor wind speed and direction. Approved to EEx ...

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 ...

The evolution of thermal mass flow meters

by Sierra Instruments, Inc.  (Oct. 6, 2010)

Who were some of the pioneers in thermal mass flow technology? A. Thermo-Systems, Inc. (TSI) began in its founder’s basement in 1959, with a cooled-film anemometer designed for transient measurements in high temperature fluid flows. This led to TSI’s hot-film and hot-wire anemometers, the first commercial products of this type. These ...

Some thoughts on in-situ flux measurement in the atmospheric surface layer

by Applied Technologies, Inc. (ATI)  (Jan. 1, 2003)

Due to its complexity, the state of a turbulent atmosphere can only be described using statistical quantities such as means, variances, and covariances. Computation of these statistical quantities, particularly those of higher order, must be done with considerable care. This is particularly true if the statistics are used to depict heat and ...

Another look at sonic thermometry

by Applied Technologies, Inc. (ATI)  (Nov. 12, 1990)

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 ...

Estimation of the surface stress from the streamwise pressure gradient: The Kármán Integral Momentum Equation revisited

by Springer  (Jan. 1, 2005)

A method is developed to estimate the stress at the surface in a portable wind tunnel for wind erosion studies. The boundary layer height and the pressure gradient are used in a simple expression from the Kármán Integral Momentum Equation. Values of friction velocity u * are within 10% of experimental values obtained through correlation ...

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 ...

Need help finding the right suppliers?

Let the XPRTs do the work for you