With the fast development of economy and technology,these days,there are all types of infrared optical lens online and in the market. For example,there are spherical lenses,aspheric lenses,aberrations and so on. Below discussed is some detailed and professional information about the optical lens. If you read them carefully and seriously,you will get more than you think.
It is a well-known fact that most lenses series
are spherical lenses. Their two surfaces are parts of the surfaces of
spheres. Each surface can be convex-bulging outwards from the lens,
concave-depressed into the lens, or planar (flat). Lenses may be cut or
ground after manufacturing to give them a different shape or size.
Aspheric lenses are more complex. These are lenses where one or both
surfaces have a shape that is neither spherical nor cylindrical. Such
lenses can produce images with much less aberration than standard simple
lenses.
Aspheric lenses are also sometimes used for eyeglasses.
These are typically designed to give a thinner lens, Aspheric eyeglass
lenses typically do not provide better vision than standard "best form"
lenses, but rather allow a thinner, flatter lens to be made without
compromising the optical. A single aspheric lens can often replace a
much more complex multi-lens system. The resulting device is smaller and
lighter, and possibly cheaper than the multi-lens design. Aspheric
elements are used in the design of multi-element wide-angle and fast
normal lenses to reduce aberrations.
Lenses do not form perfect
images, and there is always some degree of distortion or aberration
introduced by the lens which causes the image to be an imperfect replica
of the object. Careful design of the lens ensure that the aberration is
minimized. Dioptric correction is the term used for the adjustment of
the optics for a person's eyes. It is the adjustment of one lens to
provide compatible focus when the viewer's eyes have different visual
capabilities.
Most common glass has other ingredients added to
change its properties. Lead glass or flint glass can be more brilliant
because the increased refractive index, while boron may be added to
change the thermal and electrical properties, as in Pyrex. Barium also
increased the refractive index. Thorium oxide was formerly used in
producing high-quality lenses, but due to its radioactivity it has been
replaced by lanthanum oxide in modern eye glasses. An antireflective
coating is applied to the surface of lenses and other optical devices to
reduce reflection. This improves the efficiency of the system since
less light is lost.
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