Solar Radiation Measurement

1. Solar Irradiance Monitoring

A knowledge of the solar irradiance may be a valuable manner of research-based monitoring of the performance of an operational solar installation.

Since the Antarctic ozone hole was announced in 1985 (Farman et al.), Bentham has been a driving force in spectroradiometer developments for the measurement of solar irradiance.

Envirobox System
Field-based measurements with the laboratory accuracy are achievable with the Bentham Envirobox system. 

The system is based around either a compact 300mm focal length DMc150 (280-600/ 300-1100nm) or a 600mm focal length DTMc300 (280-2500nm) double monochromator, with photomultiplier detection, detection electronics and a choice of input optics.

Housed in the rugged, temperature controlled Envirobox, the spectroradiometer may be operated unattended, recording spectra up to every five minutes, over extended periods.

Input Optics
A choice of input optics are available to measure the following quantities:

Global irradiance: with an environmentally-sealed cosine diffuser and quartz fibre bundle.
Diffuse irradiance: with the addition of an automated rotating shadow band to the above. 
Direct normal irradiance: with a solar tracker mounted direct solar accessory, measuring to view the solar disk directly.

2. Accurate Spectroradiometry

Over the years, our systems have been developed with input from the solar community, resulting in high performance spectroradiometers compliant with the WMO type S-2 instrument requirements.