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New Sensors Set the Standard for Light Measurements

New Sensors Set the Standard for Light Measurements

LI-200RLINCOLN, Neb., June 18, 2015 /PRNewswire/ — For more than 40 years LI-COR light sensors have been the industry standard for light measurement. Building on this proven experience LI-COR is introducing a redesigned pyranometer, quantum sensor, photometric sensor, and line quantum sensor, all providing improved high-speed measurements with microsecond response times.

LI-COR sensors are proven performers designed for continuous monitoring in…

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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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Daily Light Integral (DLI) measurement using LI-COR Light Sensors

Daily Light Integral (DLI) measurement using LI-COR Light Sensors

Definition of DLI

The daily light integral (DLI) is a measure of the amount of light received in a single day in a particular area. For example, the number of moles of Photosynthetically Active Radiation (PAR) photons received during a single day in a square meter, or: mol m-2 d-1. Another example is  the total solar radiation received during a single day in a square meter, or: W m-2. Depending on the application or research question the time integral of…

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A Day in the Life of a Sea Ice Ecologist

A Day in the Life of a Sea Ice Ecologist

Dr. Lars Chresten Lund-Hansen, sea ice ecologist at Aarhus University in Denmark, recently completed a field campaign in which he and his team collected data and cores from sea ice. The photos below present a day’s work sampling the sea ice near Kangerlussuaq, West Greenland. Read more about this research…

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At the first look, not much appears to be going on within the temporary ice sheets that border Greenland and Earth’s polar oceans. Over the years,…

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Obtaining Correct (Positive) Values with LI-COR Underwater Radiation Sensors

Obtaining Correct (Positive) Values with LI-COR Underwater Radiation Sensors

The LI-192 Underwater Quantum Sensor and LI-193 Spherical Quantum Sensor from LI-COR are terminated with two pins that mate with the underwater cable (Figure 1).

In order to obtain the correct (positive) readings when using the underwater sensors, it is important to attach the sensor and underwater cable correctly. There is a yellow dot on the sensor connector (Figure 3) that should be aligned with the raised nub on the sensor cable before pushing them together. If the dots are…

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