Open Path Eddy Covariance System
11
The library of programs covers a variety of sensors and is continuously
growing. If your system has sensors that are not part of any program in the
library, simply add the appropriate measurement and processing instructions to
the program or contact Campbell Scientific, Inc. for assistance. Campbell
Scientific, Inc. charges for custom datalogger programming with a one hour
minimum and one hour resolution; call for current Application Engineering
time rates.
The datalogger programs align the measurements in time from the CSAT3,
LI-7500, KH20, and FW05. The CSAT3 has a fixed two scan delay and
LI-7500s shipped from Campbell Scientific, Inc. are programmed with a fixed
300 milliseconds (297.25 milliseconds) delay. These sensor delays are
removed before the time series data is saved to Final Storage and before they
are used to compute the online fluxes.
Depending on the system configuration, the datalogger programs compute
carbon dioxide flux, latent heat flux, sonic sensible heat flux, sensible heat
flux, momentum flux, and friction velocity, along with all the second moment
covariances, standard deviations, and means. The program will also compute a
sensible heat flux from the sonic sensible heat flux and latent heat flux (see
Appendix B). Each datalogger program is shipped with a Microsoft
®
Excel
workbook (tab) that describes the datalogger program outputs. There is one
worksheet (tab) per output data table.