The Shadow Band Stand,
Model SBS, is constructed of anodized aluminum, weighs
approximately 24 pounds and uses a 3" band of approximately
25" diameter to shade the pyranometer. The declination
setting must be adjusted regularly.Diffuse Solar Radiation can be determined by measuring the Direct Beam Radiation using a Normal Incidence Pyrheliometer on a Solar Tracker and the Total Solar Radiation using a Precision Spectral Pyranometer and computing the difference. However, the Diffuse measurement can be taken by shading the Direct Beam from the pyranometer measuring Total Radiation. The Eppley Laboratory manufactures two standard types of Shading Devices to be used to block the Direct Beam Radiation from a receiving sensor, the Shadow Band Stand and the Shade Disk Kit (to be used on the Automatic Solar Tracker).
The Shadow Band Stand,
Model SBS, is constructed of anodized aluminum, weighs
approximately 24 pounds and uses a 3" band of approximately
25" diameter to shade the pyranometer. The declination
setting must be adjusted regularly.
Many
National Authorities wished to shade the Precision Infrared
Radiometer to reduce the heating effect of the silicon dome.
Since they already owned the Automatic Solar Tracker, an adaption
kit was designed to shade and ventilate the PIR while the tracker
aligned NIP for direct measurement. This Shade Disk Kit, Model
SDK also allows for the measuring of Diffuse and Direct Solar
Radiation simultaneously. The SDK attaches onto the SMT-3 Tracker
and includes a mounting plate with built-in ventilators that
allows one or two instruments to be shaded by a shade disks
extended over the radiometers on an arm. The standard 1:10 ratio
is maintained by using a 6 cm diameter disk at a distance of 60
cm from the receivers of the instruments. This picture shows the
SMT-3 Tracker equipped with the SDK and an HF Cavity Radiometer,
a Normal Incidence Pyrheliometer, a Precision Spectral
Pyranometer and a Precision Infrared Radiometer.
