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  • 1916 Greenleaf St. Evanston, IL 60202
  • sales@sterlingprecision.com
  • (847) 864 6900
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  • CUSTOM OPTICAL FILTERS CUSTOM OPTICAL FILTERS
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UV OPTICS
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UV OPTICS

Ultraviolet (UV) is a form of electromagnetic radiation with wavelength from 10 nm to 400 nm, shorter than that of visible light, but longer than X-rays. UV radiation is present in sunlight, and constitutes about 10% of the total electromagnetic radiation output from the Sun. It is also produced by electric arcs and specialized lights, such as mercury-vapor lamps, tanning lamps, and black lights. Although long wavelength ultraviolet is not considered an ionizing radiation because its photons lack the energy to ionize atoms, it can cause chemical reactions and causes many substances to glow or fluoresce. Consequently, the chemical and biological effects of UV are greater than simple heating effects, and many practical applications of UV radiation derive from its interactions with organic molecules.


**We want to emphasize the sterilization of surfaces, especially during this time with COVID.**

 

Short-wave ultraviolet light damages DNA and sterilizes surfaces with which it comes into contact. For humans, suntan and sunburn are familiar effects of exposure of the skin to UV light, along with an increased risk of skin cancer. The amount of UV light produced by the Sun means that the Earth would not be able to sustain life on dry land if most of that light were not filtered out by the atmosphere. More energetic, shorter- wavelength UV below 121 nm ionizes air so strongly that it is absorbed before it reaches the ground. However, ultraviolet light (specifically, UVB) is also responsible for the formation of vitamin D in most land vertebrates, including humans. The lower wavelength limit of human vision is conventionally taken as 400 nm, so ultraviolet rays are invisible to humans, although some people can perceive light at slightly shorter wavelengths than this. The UV spectrum has effects both beneficial and harmful to life. 

Ultraviolet Light From Our Sun

The sun is a source of the full spectrum of ultraviolet radiation, which is commonly subdivided into UV-A, UV-B, and UV-C. These are the classifications most often used in Earth sciences. UV-C rays are the most harmful and are almost completely absorbed by our atmosphere. UV-B rays are the harmful rays that cause sunburn. Exposure to UV-B rays increases the risk of DNA and other cellular damage in living organisms. Fortunately, about 95 percent UV-B rays are absorbed by ozone in the Earth's atmosphere.

We make UV mirrors, lenses, windows, filters, and prisms that go into scanners and detectors to detect UV light.

 

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  • Address: Sterling Precision Optics
    1916 Greenleaf St.
    Evanston, IL 60202
  • Phone:  (847) 864 6900
  • Fax:  847.864.6910
  • Email:  sales@sterlingprecision.com

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