1/8/2024 0 Comments Mercury color![]() be damaging for eyes and the skin.įurther, in combination with a phosphor on the inner surface of the glass tube one can generate white light for illumination purposes (→ fluorescent lamps). lighting), one often requires an absorbing UV filter for removing the ultraviolet light, which could otherwise e.g. 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.Ī particularly high radiance is not required for such applications.įor efficient UV generation, one of course requires a lamp glass with a high transmittance in that spectral region.įor applications where only the visible lamp output is utilized (e.g. There is a substantial number of standard spectral lines of mercury, which can be produced with mercury-based spectral lamps typical wavelengths are 184.5 nm, 253.7 nm, 365.4 nm, 404.7 nm, 435.8 nm, 546.1 nm, 578.2 nm and 1014 nm. The emission of low-pressure mercury lamps exhibits a characteristic optical spectrum with pronounced spectral lines mostly in the visible and the ultraviolet spectral region, but partly also in the infrared. The power density and the radiance of the emitted light are relatively low. ![]() In low-pressure lamps, the temperature rise is moderate, leading to a substantial, but not dramatic increase of mercury pressure during operation. See the article on metal vapor lamps for general properties of such lamps. Like most other types of metal vapor lamps, mercury vapor lamps need to be operated with a suitable electrical ballast for stabilizing the electric current. When such a lamp is switched off, the mercury is largely bound in the amalgam, which implies that the toxic risk associated with breaking the lamp is reduced: one may collect the amalgam pieces before much of the mercury has evaporated. Instead of liquid mercury, a mercury vapor lamp may contain an amalgam. The lamp can start with a relatively low vapor pressure, which subsequently (within a couple of minutes) increases due to the heating during operation, because more of the liquid mercury is evaporated. Therefore, a lamp enclosing may in principle contain mercury only, but often there is also some starter gas like argon or xenon. Mercury (Hg) is the only elementary metal which has a substantial vapor pressure at room temperature. Mercury vapor lamps are metal vapor lamps based on light emission from mercury (Hg) atoms. How to cite the article suggest additional literature Using our ad package, you can display your logo and further below your product description.ĭefinition: metal vapor lamps based on light emission from mercury (Hg) atoms
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