4-Component Net Radiometer
Integrated net radiometer, providing global hemispheric values of incoming and outgoing (from the surface) radiation in the total visible and total infrared wavelengths. From these, net radiation (ISFS Rsum), albedo, and radiative sky and surface temperature may be calculated. Typically mounted by ISFS on a stand-alone tripod at 2m above the surface. ISFS embeds a PIC-based microprocessor to digitize the measurements inside the sensor and report calbrated values over an RS232 or I2C digital interface. Note that infrared (long-wave) radiation (Rlw) is the sum of a radiative flux measured by a thermopile (Rpile) plus the equivalent black-body radiation of the temperature of the sensor (Tcase). A description of this calculation is in an ISFS guide.
Provided with a factory calibration, though ISFS compares values to reference sensors as needed and is developing a black-body system to calibration the infrared radiometers in EOL's calibration laboratory.