Open-Path Eddy-Covariance System
Customizable, Integrated System
Requires as little as 6 W of power
weather applications supported water applications supported energy applications supported gas flux & turbulence applications supported infrastructure applications supported soil applications supported


The open-path eddy-covariance systems measure sonic-sensible heat flux, momentum flux, and the flux of other scalars between the atmosphere and earth’s surface. The system consists of a data logger, fast-response, three-dimensional sonic anemometer, and fast-response scalar sensors. An independent measure of temperature and humidity from a slow-response sensor is also measured to calculate background meteorological variables. Horizontal wind speed and direction are computed by the data logger from the three-dimensional measurements of wind made by the sonic anemometer.

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This system typically measures the following parameters:

  • Carbon-dioxide flux
  • Water-vapor flux
  • Momentum flux
  • Turbulence intensity
  • Sensible heat flux
  • Three-dimensional wind velocity
  • Sonic temperature
  • Air temperature
  • Barometric pressure

Benefits and Features

  • Customizable system providing a range of measurement options
  • Measurements are temporally synchronized through a common set of electronics
  • Low noise
  • Fully integrated, turn-key system
  • User-selectable output bandwidths
  • Low power consumption; suitable for solar power applications
  • Field rugged
  • Field serviceable
  • On-board data storage using CompactFlash cards and a memory module
  • Extensive set of diagnostic parameters to warn of questionable data
  • Colocated measurement volumes for both analyzer and anemometer


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