About: Toroidal reflector

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A toroidal mirror is a reflector whose surface is a section of a torus, defined by two radii of curvature. Such reflectors are easier to manufacture than mirrors with a surface described by a paraboloid or ellipsoid. They suffer from spherical aberration and coma, but do not suffer from astigmatism like a spherical mirror when used in an off-axis geometry, provided the angle of incidence is matched to the design angle. Because they are easier to manufacture, they are much cheaper than ellipsoidal or paraboloidal mirrors for the same surface quality.

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  • A toroidal mirror is a reflector whose surface is a section of a torus, defined by two radii of curvature. Such reflectors are easier to manufacture than mirrors with a surface described by a paraboloid or ellipsoid. They suffer from spherical aberration and coma, but do not suffer from astigmatism like a spherical mirror when used in an off-axis geometry, provided the angle of incidence is matched to the design angle. Because they are easier to manufacture, they are much cheaper than ellipsoidal or paraboloidal mirrors for the same surface quality. Toroidal mirrors are used in Yolo telescopes and optical monochromators. In these devices, the source and detectors of the light are not located on the optical axis of the mirror, so the use of a true paraboloid of revolution would cause a distorted image. (en)
  • 環形面鏡是一種拋物面鏡，取決於鏡像的角度而有不同的焦距。曲率實際上就是的橢圓。如形狀是環形，鏡像就會表現出球面像差。 環形面鏡使用在Yolo 望遠鏡和單色器 (圖上的C和E)。在這些設備中，光線的來源和探測器不位於面鏡的光軸上，所以使用真實旋轉拋物面會導致圖像的扭曲。 (zh)
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  • 環形面鏡是一種拋物面鏡，取決於鏡像的角度而有不同的焦距。曲率實際上就是的橢圓。如形狀是環形，鏡像就會表現出球面像差。 環形面鏡使用在Yolo 望遠鏡和單色器 (圖上的C和E)。在這些設備中，光線的來源和探測器不位於面鏡的光軸上，所以使用真實旋轉拋物面會導致圖像的扭曲。 (zh)
  • A toroidal mirror is a reflector whose surface is a section of a torus, defined by two radii of curvature. Such reflectors are easier to manufacture than mirrors with a surface described by a paraboloid or ellipsoid. They suffer from spherical aberration and coma, but do not suffer from astigmatism like a spherical mirror when used in an off-axis geometry, provided the angle of incidence is matched to the design angle. Because they are easier to manufacture, they are much cheaper than ellipsoidal or paraboloidal mirrors for the same surface quality. (en)
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  • Toroidal reflector (en)
  • 環形面鏡 (zh)
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