Low Pressure Mercury Uv Lamp Spectrum

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Low pressure mercury uv lamp spectrum.

Low pressure germicidal lamps have an operating lifetime of up to 12 000 hours and convert up to 40 of the lamp s electrical power into uvc offering an efficient and cost effective alternative to medium pressure mercury lamps for water air and surface disinfection systems as well as controlling unwanted odours in the air. The german physicist leo arons 1860 1919 studied mercury discharges in 1892 and developed a lamp based on a mercury arc. Even though more cleaning may be required for medium and amalgam lamp based systems because they have a smaller number of lamps in the uv unit these systems can. Optimum mercury vapor pressure the concentration of mercury atoms in the discharge the mercury vapor pressure must be controlled in order to optimize the conversion of electrical power to uv radiation.

Often called germicidal or ozone absorption lamps they are very stable light sources. Medium pressure lamps produce the greatest uv output per unit length of lamp of the 3 lamp types. Charles wheatstone observed the spectrum of an electric discharge in mercury vapor in 1835 and noted the ultraviolet lines in that spectrum. New high power amalgam lamps are significantly more powerful than low pressure lamps.

Low pressure mercury lamps are also used as relatively efficient sources of ultraviolet light for applications like uv curing lithography uv spectroscopy solarium ozone generation water sterilization and other germicidal irradiation. Its humanitarian value has had worldwide success since. Designed by experienced engineers and by using quality material in combination with a tightly controlled manufacturing process we provide high quality lamps free of impurities to maintain strong and stable output throughout life of the lamp. These types of lamps are available in ozone producing and ozone free quartz with a variety of phosphors.

6 microns 006 torr. We re exposed to parts of the uv spectrum while outdoors. In 1860 john thomas way used arc lamps operated in a mixture of air and mercury vapor at atmospheric pressure for lighting. This was so important that westinghouse quickly commercialized the low pressure mercury vapor germicidal lamp in the early 1930 s.

Rather than a cold spot the lamp s amalgam spot on pellet regulates mercury vapor pressure during operation and yields up to three times the uvc output of a standard low pressure mercury lamp of the same length. The lamp will produce its maximum output when the mercury vapor pressure is approx. At low vapor pressures the. Amalgam lamps use a mercury amalgam mix to control mercury vapor pressure.

A particularly high radiance is not required for such applications.