Classification of discharge lamps and the major areas of their application. Gas-discharge light source or a discharge lamp is called the electric lamp in which light is produced by the electric discharge in a gas and (Or) metal vapor. The principle of the device used and type of discharge. The vast majority of gazogazorazryadnyh tubes are transparent to optical radiation flask cylindrical, spherical or other shapes. A flask is hermetically soldered two main electrodes, between which a discharge occurs. Sometimes the plugs are soldered to facilitate additional electrodes. The interior space flask after removing the air and thorough bake-out lamps (removal of adsorbed material in the bulb and the electrodes of the water vapor and other gases by heating under evacuation) is filled with a specific gas (usually inert) to a different pressure or inert gas and a small amount of metal with a high vapor pressure, such as mercury, sodium, etc.

Since the mid 60's lamps are widely used, but in which an inert gas and mercury enter the special emitting additives, which are mostly various metal halides. There is a category discharge lamps with electrodes, operating in an open atmosphere in which the discharge occurs in air and vapor material of electrodes. This carbon arc. In this type of lamp is consumed during the electrode material. In special types of lamps lit in the flowing discharge gas. There are also lamps, which use high-frequency electrodeless discharge. They are a sealed flask without electrodes, containing the necessary gases or vapors.

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