The laws of optics dictate that a solar collector with a low concentration ratio can have a high acceptance angle and thus in some instances does not require active solar tracking.
22.
Concentrating technologies exist in five common forms, namely parabolic trough, enclosed trough, dish Stirlings, acceptance angle, that is, for the same overall tolerances for the system.
23.
When a light ray is incident from a medium of refractive index n to the core of index at the maximum acceptance angle, Snell's law at the medium core interface gives
24.
For example, the parabolic trough concentration is about 1 / 3 of the theoretical maximum for the same acceptance angle, that is, for the same overall tolerances for the system.
25.
The core is surrounded by a medium with a lower index of refraction, typically a acceptance angle, and the rays that are confined by the core / cladding boundary are called guided rays.
26.
If the acceptance angle of the optic is wide enough, sunlight incident along the optical axis will be captured by the concentrator, as shown in the " angular aperture of sunlight " figure.
27.
Compared to the similar Glan Foucault prism, the Glan Thompson has a wider acceptance angle, but a much lower limit of maximal irradiance ( due to optical damage limitations of the cement layer ).
28.
For a given concentration, nonimaging optics combine the widest possible high concentrations, a wide acceptance angle can be seen as a measure of how tolerant the optic is to imperfections in the whole system.
29.
The amount of light energy available for use depends on the intensity of the source in the space defined by the slit ( width & times; height ) and the acceptance angle of the optical system.
30.
Compared to the Glan Thompson prism, the Glan Foucault has a narrower acceptance angle over which it works, but because it uses an air gap rather than cement, much higher irradiances can be used without damage.
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