If the discharge should be interrupted (e.g. What is the definition of mercury arc lamp? The outer bulb may be clear or coated with a phosphor; in either case, the outer bulb provides thermal insulation, protection from the ultraviolet radiation the light produces, and a convenient mounting for the fused quartz arc tube. To access this and other valuable technical resources, please sign in or register for a new online account. The pressure in the quartz arc-tube rises to approximately one atmosphere once the bulb has reached its working temperature. It needs to be vaporized and ionized before the lamp can produce its full light output. Enter your email address below to reset your account password. This helps to fill in the otherwise very-deficient red end of the electromagnetic spectrum. [16], In the US, ballasts for mercury vapor lamps for general illumination, excluding specialty application mercury vapor lamp ballasts, were banned after January 1, 2008. High-pressure mercury-vapor lamps are commonly used for general lighting purposes. HBO 200W: 400 hrs. [1] This is not flattering to human skin color, so such lamps are typically not used in retail stores. The arc discharge is generally confined to a small fused quartz arc tube mounted within a larger borosilicate glass bulb. Most modern mercury vapor lamps have this coating. Unlike most other UV sources, the medium-pressure lamp (MPL) has a polychromatic spectral distribution from 190 nm up to the infrared spectrum. HBO and HXP Mercury Short Arc Lamps (≤ 200W) XBO Xenon Short Arc Discharge Lamps (≤450W) XBO Xenon Discharge Lamps (>450W) Ultraviolet Lamps; Spectral Discharge Lamps; STUDIOLINE Lamps; Specialty Halogen and Incandescent; Specialty Lampholders and Sockets; DS (US) HBO Mercury Short Arc Lamps (>200W) Areas of application . The arc discharge is generally confined to a small fused quartz arc tube mounted within a larger borosilicate glass bulb. ), which has found application in modern compact projection devices. As with the ultraviolet output, the glass outer bulb is largely opaque at these frequencies and thus for this purpose needs to be removed (or omitted in purpose-made lamps). They generate UV and IR light in the 240-270nm and 350- 380nm regions of the spectrum and have a lifespan of about 1,500 hours. Ensure that only authorized personnel are in the vicinity of the source, and wearing the necessary safety equipment such as UV protective eyewear, clothing, and gloves. Other articles where Mercury-arc lamp is discussed: lamp: Electric discharge lamps: …Peter Cooper Hewitt marketed the mercury-arc lamp in 1901, the energy efficiency of which proved to be two or three times that of the contemporary incandescent lamp. Advanced Radiation Corporation's series of direct current Mercury Short Arc Lamps for photolithography represents the state-of-the-art in design, manufacture, and performance of high intensity ultraviolet sources. HBO ® Mercury Short Arc Lamps (>200W) Precision performance. [4] In February 1896 Herbert John Dowsing and H. S. Keating of England patented a mercury vapor lamp, considered by some to be the first true mercury vapor lamp.[5]. 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. [11] A common method of correcting this problem before phosphors were used was to operate the mercury lamp in conjunction with an incandescent lamp. The tube is filled with mercury and argon. One of the original complaints against mercury lights was they tended to make people look like "bloodless corpses" because of the lack of light from the red end of the spectrum. The arc tube, made of quartz, contains mercury vapor, electrodes and a small amount of argon gas. As the ionized argon conducts, the heat from its arc vaporizes the liquid mercury; next, the voltage between the two main electrodes will ionize the mercury gas. Clear mercury lamps produce white light with a bluish-green tint due to mercury's combination of spectral lines. Login to view your complete order history. HBO 100W: 200 hrs. Self-ballasted mercury vapor lamps can be screwed into a standard incandescent light socket supplied with the proper voltage. In fact, the first British fluorescent lamps were designed to operate from 80-watt mercury vapor ballasts. HXP lamps are short arc lamps in which the discharge arc burns in an atmosphere of mercury vapour at very high pressure. The outer bulb may be clear or coated with a phosphor; in either case, the outer bulb provides thermal insulation, protection from the ultraviolet radiation the light produces, and a convenient mounting for the fused quartz arc tube. When the lamp is in operation, the mercury within the tube evaporates completely and creates the required pressure. Mercury (Hg) arc lamps are ideal light sources for applications that require high intensity spectral lines emitted in the deep UV to visible light regions. There are also self-ballasted mercury vapor lamps available. They have many intense bands at wavelengths across the UV and visible light spectrum and emit bright UV light. In addition to the mercury, the tube is filled with argon gas at low pressure. It uses an arc through vaporized mercury in a high pressure tube to create very bright light directly from it's own arc. The Hewitt lamps used a large amount of mercury. The carbon arc light, which consists of an arc between carbon electrodes in air, invented by Humphry Davy in the first decade of the 1800s, was the first practical electric light. Key Features and Benefits. "Mercury Lamp" redirects here. Therefore, it requires a ballast to limit the current through it. Department of Energy §431.286 Energy conservation standards and their effective dates. In medium-pressure mercury-vapor lamps, the lines from 200–600 nm are present. They operate at an internal pressure of around one atmosphere and require special fixtures, as well as an electrical ballast. It does not affect the use of mercury in compact fluorescent lamp, nor the use of mercury lamps for purposes other than lighting. Although other types of HIDs are becoming more common, mercury vapor lamps are still sometimes used for area lighting and street lighting in the United States. mercury - Temperatur: Letzter Beitrag: 21 Mai 11, 22:42: The mercury could climb to a balmy 27 degrees in parts of South Germany on Monday. This is usually achieved by using a thin carbon strip, which will burn up in the presence of air, to connect one of the electrodes. Mercury vapor lamps without any phosphor are second best; they produce only a few distinct mercury lines that need to be filtered out. Usually, the borosilicate glass outer bulb of the lamp performs this function but special care must be taken if the lamp is installed in a situation where this outer envelope can become damaged. These are typically high powered to rapidly cure and set the inks used. So if the lamp is connected directly to a constant-voltage source like the power lines, the current through it will increase until it destroys itself. [6] Hewitt was issued U.S. Patent 682,692 on September 17, 1901. Because of the light emitted by the filament, they have slightly better color rendering properties than mercury vapor lamps. [17] Because of this, several manufacturers have begun selling replacement compact fluorescent (CFL) and light emitting diode (LED) bulbs for mercury vapor fixtures, which do not require modifications to the existing fixture. The center discharge tube of the high-pressure mercury lamp is made of quartz glass. [9][10] The entire warm-up process takes roughly 4 to 7 minutes. Special ultra high-pressure mercury vapor lamps called Ultra-high-performance lamps are commonly used in digital video projectors, including DLP, 3LCD and LCoS projectors. Even with these methods, some UV radiation can still pass through the outer bulb of the lamp. [citation needed], Mercury vapor lamps are used in the printing industry to cure inks. [15] The 185 nm line will create ozone in an oxygen containing atmosphere, which helps in the cleaning process, but is also a health hazard. The main motor pole is made of tungsten and filled with alkaline earth metal oxide electron-emitting substances. The reason for a prolonged period of time before the lamp restrikes is because the elevated pressure, which leads to higher breakdown voltage of the gas inside (voltage needed to start an arc – Paschen's law), which is outside the capabilities of the ballast. Fused silica is used in the manufacturing to keep the 184 nm light from being absorbed. When outside, coated or color corrected lamps can usually be identified by a blue "halo" around the light being given off. In the EU the use of low efficiency mercury vapor lamps for lighting purposes was banned in 2015. These lamps provide intense radiation corresponding to the photo-sensitivity of most presently available photoresist materials. Polycarbonate suffers particularly from this problem, and it is not uncommon to see fairly new polycarbonate surfaces positioned near the lamp to have turned a dull, yellow color after only a short time. 16, 15:54: Rechtschreibfehler. [citation needed]. For placements where light pollution is of prime importance (for example, an observatory parking lot), low-pressure sodium is preferred. These lamps use a tungsten filament in series with the arc tube both to act as a resistive ballast and add full spectrum light to that of the arc tube. To correct the bluish tinge, many mercury vapor lamps are coated on the inside of the outer bulb with a phosphor that converts some portion of the ultraviolet emissions into red light. Sodium iodide and scandium iodide are commonly in use. Their unique UV emission spectra make them popular for unique applications that need enhanced UV output such as UV spectroscopy, UV curing and other industrial processes, and environmental and medical applications. Additional drawings are not available for this product. These lamps can produce much better quality light without resorting to phosphors. A very closely related lamp design called the metal halide lamp uses various compounds in an amalgam with the mercury. This 200 watt Hg lamp has a 0.6 x 2.2 mm effective arc size. The increase in pressure results in further brightening of the lamp. Mit Flexionstabellen der verschiedenen Fälle und Zeiten Aussprache und … Also, special "safety" lamps are made that will deliberately burn out if the outer glass is broken. USHIO offers 3 types of special coated Low-Pressure Mercury-Arc lamps, UV-B, BL and BLB. The MLB series Mercury lamp ballasts are offered in 5 sizes from 650 to 7000 watts. How do you use mercury arc lamp in a sentence? Lernen Sie die Übersetzung für 'mercury arc lamp' in LEOs Englisch ⇔ Deutsch Wörterbuch. Choose products to compare anywhere you see 'Add to Compare' or 'Compare' options displayed. It is recommended to vent the ozone that is produced by some lamp models to the outside or use an Ozone Eater. Low-pressure mercury-vapor lamps[14] usually have a quartz bulb in order to allow the transmission of short wavelength light. These lamps have only the same or slightly higher efficiency than incandescent lamps of similar size, but have a longer life. The outer bulb, usually filled with nitrogen, protects the arc tube from damage and atmospheric corrosion. Mercury vapor lamps are becoming obsolete due to the higher efficiency and better color balance of metal halide lamps. Mercury arc lamps are the workhorses of the curing industry. osram.com.tr HXP -Lampen sind Kur zb ogenlampen, bei denen der Entladungbogen in einer At mo sphär e v on Quecksilber unter hohem Druck bre nnt . Mercury arc lamps usually feature starting coils on one or both of the electrodes to assist in arc formation during ignition and have an anode-cathode gap ranging from 0.25 to several millimeters, depending upon the lamp power rating. There is also an increase in red color (e.g., due to the continuous radiation) in ultra-high-pressure mercury vapor lamps (usually greater than 200 atm. vapor lamp is a high intensity discharge lamp. We recommend purchasing replacement Mercury lamps only as needed. Creating a nearly shadow-free light and less glare, the lamp immediately found wide use for industrial and street lighting in the United States. The arc tubes of high-pressure lamps, which have a diameter of 8–60 mm and a length of 30–1,500 mm, are made of refractory, transparent quartz glass and are filled with an inert gas and a certain quantity of mercury. [7] In 1903, Hewitt created an improved version that possessed higher color qualities which eventually found widespread industrial use. Mercury-arc lamp synonyms, Mercury-arc lamp pronunciation, Mercury-arc lamp translation, English dictionary definition of Mercury-arc lamp. Continued vaporization of the liquid mercury increases the arc tube pressure to between 2 and 18 bar, depending on lamp size. [20] When used in locations like gyms, the fixture should contain a strong outer guard or an outer lens to protect the lamp's outer bulb. This means its resistance decreases as the current through the tube increases. Between the electrode and the quartz glass, a non-matching gas-tight joint is formed with a molybdenum foil. The strongest peaks of the emission line spectrum are[12][13]. A mercury-vapor lamp is a gas-discharge lamp that uses an electric arc through vaporized mercury to produce light. After a lamp has reached its rated life in hours, it should be inspected for cloudiness. For example, a standard 250-watt general-lighting mercury lamp produces significant output from 120 GHz to 6 THz. This causes the aging process of some plastics used in the construction of luminaires to be accelerated, leaving them significantly discolored after only a few years' service. What are synonyms for mercury arc lamp? In contrast, xenon arc lamps contain pure xenon gas. HBO mercury lamps are short arc lamps in which the luminous arc burns in an atmosphere … 6283NS , 6285 and 6286 Mercury Lamp Spectral Irradiance. As it emits narrow spectral lines at two very close wavelengths, it is the easiest to filter out. In addition, shorter wavelengths in the mid-infrared are emitted from the hot quartz arc-tube envelope. [2], Charles Wheatstone observed the spectrum of an electric discharge in mercury vapor in 1835, and noted the ultraviolet lines in that spectrum. If you have turned a 100W burner on only 10 times for 20 hr periods and otherwise cared for it properly, it may not be cloudy and last for many hours beyond its rated life. The 6283NS Mercury Arc Lamp contains an exactly measured amount of mercury and either argon gas or xenon which acts as a starter gas as the mercury vaporizes. These lamps are each coated with special blended phospor to emit radiation peaking at 306nm (UV-B), 352nm(BL) or 368nm (BL & BLB). [6] The ultraviolet light from mercury vapor lamps was applied to water treatment by 1910. In the 1930s, improved lamps of the modern form, developed by the Osram-GEC company, General Electric company and others led to widespread use of mercury vapor lamps for general lighting. [19] There have been documented cases of lamps being damaged in gymnasiums by balls striking the lamps, resulting in sun burns and eye inflammation from shortwave ultraviolet radiation. When a mercury vapor lamp is first turned on, it will produce a dark blue glow because only a small amount of the mercury is ionized and the gas pressure in the arc tube is very low, so much of the light is produced in the ultraviolet mercury bands. An arc initiates between the two main electrodes and the lamp will then radiate[8] mainly in the ultraviolet, violet and blue emission lines. The mercury in the tube is a liquid at normal temperatures. ©2021 Newport Corporation. As the main arc strikes and the gas heats up and increases in pressure, the light shifts into the visible range and the high gas pressure causes the mercury emission bands to broaden somewhat, producing a light that appears more nearly white to the human eye, although it is still not a continuous spectrum. Also known as mercury lamp. Mercury (Hg) arc lamps are ideal light sources for applications that require high intensity spectral lines emitted in the deep UV to visible light regions. Semiconductor; HBO > 200W for ASML. It also regulates the arc tube operating temperature and acts as a filter to absorb ultraviolet radiation. Mercury vapor lamps are more energy efficient than incandescent and most fluorescent lights, with luminous efficacies of 35 to 65 lumens/watt. Rated life of mercury arc lamps is as follows: HBO 50W : 100 hrs. All rights reserved. The US Department of Energy determined in 2015 that regulations proposed in 2010 for the mercury vapor type of HID lamps would not be implemented, because they would not yield substantial savings.[18]. This is different from fluorescents which use the mercury vapor arc to create a weaker light that mainly creates [3] The German physicist Leo Arons (1860–1919) studied mercury discharges in 1892 and developed a lamp based on a mercury arc. These lamps are generally called "color corrected" lamps. Arc-lamps. The mercury vapor lamp is a negative resistance device. Newport strives to keep Hg bulbs in stock to reduce lead times when ordering a replacement. Mercury vapor lamp ballasts are similar to the ballasts used with fluorescent lamps. Product family … They also require a warm-up period of four to seven minutes to reach full light output. USHIO Germicidal lamps are Low-Pressure Mercury-Arc lamps that emit radiation peaking at 253.7nm (UV-C). The mercury short-arc lamps commonly utilized in fluorescence microscopy are gas-discharge lamps that contain a mixture of liquid mercury and an inert gas (such as argon or xenon), housed within a glass envelope together with a pair of closely spaced electrodes.

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