Another way to highlight features is the use of ultraviolet radiation which has a wavelength of 10 to nm. By means of fluorescent lamps "black light" or ultraviolet LEDs it is relatively simple to generate UV light with a wavelength of nanometres in the near "UV-A range". Nevertheless normal glasses absorb large quantities of the emitted light even in this range. This also applies to standard optics of the camera system, filter glasses and also the protective glass on the sensor. Many applications can still be solved using standard components, as the excitation due to UV radiation causes many materials to fluoresce in the visible range. Real UV applications in shorter-wave light ranges, however, require special optics, e.
A UV bulb is sometimes referred to as a "germicidal" bulb because it inactivates germs. The bulb is similar to a fluorescent bulb, except that it lacks the internal phosphor coating and is housed in fused quartz rather than glass. UV light is shorter wavelength higher energy than visible. It is called ultraviolet because it is just beyond violet light. Technically, ultraviolet light is defined to be any wavelength of light - also called electromagnetic radiation - shorter than nanometer. Ultraviolet light is emitted by 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.
Ultraviolet Schools Wikipedia Selection. Related subjects: General Physics Ultraviolet UV light is electromagnetic radiation with a wavelength shorter than that of visible light, but longer than soft X-rays. It can be subdivided into near UV — nm wavelength; abbrev. NUV , far or vacuum UV —10 nm; abbrev.