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Month: February 2013

Filtering LI-7700 high frequency data using diagnostic value information

Filtering LI-7700 high frequency data using diagnostic value information

The LI-7700 outputs a variable titled DIAG – Diagnostic Value, at the same output rate as the measured data stream which can be used to filter the raw high frequency data. The diagnostic value from the LI-7700 is a 16-bit number that can be broken down to the 16 individual bits to identify various diagnostic information about the instrument.  When processing LI-7700 data for Eddy covariance measurements, the raw data needs to be filtered to exclude situations when the measured…

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New LI-6400XT iOS App Update

New LI-6400XT iOS App Update

Controlling your photosynthesis system just became easier and more convenient thanks to the latest LI-6400XT iOS app update (compatible with iPhone, iPod Touch, and iPad). New features include the ability to:

-Run a simulator for current or previous versions of LI-6400 software
-Copy files to and from the LI-6400 and your iPad/iPhone/iPod
-View, graph, and email…

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Measuring PPFD and PPFFR with LI-COR Underwater Radiation Sensors

Measuring PPFD and PPFFR with LI-COR Underwater Radiation Sensors

Phytoplankton, algae, and aquatic plants use photosynthetically active radiation (PAR) with wavelengths between 400 and 700 nanometers for photosynthesis.  This radiation comes from the sun and its intensity is characterized as Photosynthetic Photon Flux Density (PPFD) in units of micromoles of photons per square meter per second (µmol/m2/s).  These organisms are also illuminated by reflections from the bottom surface and particles suspended in the water.  The total number of photons incident on a point from all directions is called Photosynthetic…

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