Non-imaging optics
is an approach to collecting, concentrating and transporting light. As the name suggest, a non-imaging optic does not produce an image of the light source, but rather concentrates light at high density.
Comparison
The difference between non-imaging and imaging optics is that non-imaging optics have a focal zone, or target, rather than a single focal point and an acceptance angle. All light falling within the acceptance angle is transmitted to the target.
Solar Radiation
One application of non-imaging collectors is to increase the power density of solar radiation. A non-imaging concentrator can concentrate low-density solar radiation with the need to track the sun across the sky.
History
The history of non-imaging optics can be traced back to the 1960s, when it was discovered that it was possible to build an optical system capable of collecting an amount of light close to the theoretical maximum. There were three periods of rapid development in the field in the 1970s, 1980s and 1990s, driven by the desire to create wide-angle solar collectors.
Tags: acceptance angle, non-imaging optics
