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Sunshine Pyrometer

Sunshine Pyrometer

Sunshine Pyrometer
Specifications :
Global (Total) and Diffuse irradiation in W.m-2
WMO sunshine threshold: 120 W.m-2 direct beam
No moving parts, shade rings or motorized tracking
protected by patents EP 1012633 and US 6417500
No routine adjustment or polar alignment
Works at any latitude
Precision ground glass dome
Direct and Diffuse Radiation:
To accurately measure the direct and diffuse components of incident solar radiation, it uses a range of seven miniature thermopile sensors and a computer-generated shading pattern
Besides, it can compute direct radiation by subtracting the diffuse from the global (total) radiation
Sunshine Duration:
The WMO threshold for bright sunshine is 120 W.m-2 in a plane perpendicular to the direct solar beam
The SPN1 uses an algorithm based on the ratio of direct to diffuse radiation
It is combined with the absolute values to effectively estimate sunshine duration within a few percent of the WMO standard
Requires neither adjustment or reposition to track the sun, which is a distinct advantage over devices with shadow rings
No complex electro-mechanical assemblies and no burnt paper tracks to interpret
Outputs and Logging:
It provides 2 analogue voltage outputs for global and diffuse radiation
A digital output for sunshine duration can be effectively connected to data loggers like Delta-T DL2e and GP1
Accurate readings can also be obtained directly from the RS-232 port
Following are its application areas:
Air pollution studies
Cloud cover research
ET and heat flux studies
Canopy analysis
Building energy management systems
PV (photo-voltaic) efficiency monitoring

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