Browsed by
Tag: radiation

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…

Read More Read More

Appropriate Sky Conditions for Using the LAI-2000

Appropriate Sky Conditions for Using the LAI-2000

For users of the LAI-2000 Plant Canopy Analyzers, just a reminder that an overcast sky is the best condition in which to use the instrument.

Under cloudy skies, the contribution of scattered radiation is low; when the direct beam of the sun is shining on foliage, scattered radiation is significantly increased. The LAI-2000 optical sensor is filtered to reject radiation above 450 nm, which minimizes the influence of radiation scattered by the foliage. If scattered radiation is present, however, the…

Read More Read More

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…

Read More Read More

Interfacing LI-COR Radiation Sensors with Campbell Scientific Dataloggers

Interfacing LI-COR Radiation Sensors with Campbell Scientific Dataloggers

Many of our users like to interface LI-COR radiation sensors with dataloggers from Campbell Scientific. LI-COR can provide millivolt adapters for use with our type “SA” radiation sensors; these adapters have a BNC connector that mates with the sensor, and are terminated with bare wire leads for connection to the datalogger. If a differential measurement is used for your LI-COR radiation sensor that is not referenced to the…

Read More Read More