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PYRHELIOMETER

A pyrheliometer is used to measure beam or direct solar radiation.  Most often called Direct Normal Irradiance (DHI)  Typically, the pyrheliometer is mounted on a tracking mechanism and is pointed directly at the sun. The motorised tracking system automatically tracks the sun as it moves across the sky.  An Active Solar Tracker will lock to the sun's position and automatically follow every minute of the day throughout the year.

PYRANOMETER

A pyranometer is used to measure global Horizontal Irradiance (GHI) and can also be used to measure the total irradiance that would fall on the solar panels of a static Array, by positioning the sensor on this angle.  Likewise, you can install the sensor on a single or dual axis tracking array to determine Array performance.

Commonly required in partnership with the DNI; Pyranometers are often called for to measure both diffuse irradiance in an active solar tracker with a shading disc & Total (global ) irradiance.  By subtracting the diffuse from the total you can calculate the Direct Normal Irradiance, albeit not as accurately as with a dedicated tracking Pyrheliometer. 

NET RADIOMETER / NET PYRRADIOMETER

Net radiation monitoring can be achieved for both global radiation (short and long wave incoming and outgoing (reflected) in the one instrument, or by separating out the short wave incoming and outgoing from the long wave incoming and outgoing, providing a 4 component net radiometer.  The data derived is used in solar power plant design, solar panel design, and scientific research on materials testing & evaporation studies to name a few.

ALBEDOMETER

An Albedometer measures the ratio of global and reflected solar radiation (solar reflectance) on a plane surface.  Different soil types and roof surfaces can reflect light; if sufficient light is reflected back towards the PV panel, it may be beneficial to utilise a Bifacial PV Panel to absorb this additional light.