Research scientists contacted Sciencetech to develop a customized solar simulator for a high priority government research program. They had unique and specific spectral requirements for studying air pollution effects and photo-chemistry in the upper atmosphere. The client’s sample chamber was a rotating cylindrical drum holding suspended aerosols and this needed a uniform and collimated illumination. However, the tight laboratory space and the presence of other equipment connected to the sample drum imposed multiple constraints on Sciencetech’s proposed solution.
1) Irradiation of 1280W/m2 ; spectral distribution to match the spectrum measured in the upper atmosphere.
2) Solar simulator’s output spectrum specified from 280nm – 750nm.
3) Illumination area to cover an 80cm diameter target
4) Spatial non-uniformity of +/-10% (ASTM E927) through the drum volume.
5) Highly collimated light to uniformly illuminate through the depth of the sample drum.
6) Attenuation of irradiance in four steps, down to 10% of the total irradiance
7) The client needed the system to fit within a small lab space which added additional design and engineering constraints.
me of the major designing requirements are listed below