[citation needed], Mercury vapor lamps are used in the printing industry to cure inks. What is the meaning of mercury arc lamp? 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. HBO ® Mercury Short Arc Lamps (>200W) Precision performance. The strongest peaks of the emission line spectrum are[12][13]. 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 main motor pole is made of tungsten and filled with alkaline earth metal oxide electron-emitting substances. It was widely used starting in the 1870s for street and large building lighting until it was superseded by the incandescent lightin the early 20th century. The center discharge tube of the high-pressure mercury lamp is made of quartz glass. The tube is filled with mercury and argon. Alternatively, the beam can be safely contained by using beam tubes or fiber optic cables to deliver the light to a sample. In medium-pressure mercury lamps, a plasma that emits UV light is generated by applying electrical voltage. HBO 200W: 400 hrs. Such a lamp can then be used for ultraviolet germicidal irradiation. These lamps have only the same or slightly higher efficiency than incandescent lamps of similar size, but have a longer life. [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. For example, a standard 250-watt general-lighting mercury lamp produces significant output from 120 GHz to 6 THz. Additional CAD file downloads are not available for this product. Arc-lamps. Even at full intensity, the light from a mercury vapor lamp with no phosphors is distinctly bluish in color. 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. Some mercury vapor lamps (including metal halide lamps) must contain a feature (or be installed in a fixture that contains a feature) that prevents ultraviolet radiation from escaping. In medium-pressure mercury-vapor lamps, the lines from 200–600 nm are present. These lamps provide intense radiation corresponding to the photo-sensitivity of most presently available photoresist materials. For the character in the Rozen Maiden anime and manga, see, Learn how and when to remove this template message, History of street lighting in the United States, "Two Centuries of Electric Light Source Innovations", Two Centuries of Electric Light Sources Innovations, Mercury vapour lamps and action of ultra violet rays – Transactions of the Faraday Society (RSC Publishing), Persistent Lines of Neutral Mercury (Hg I), "Crystec Technology Trading GmbH, Low pressure mercury-vapor lamps". High-pressure mercury-vapor lamps are commonly used for general lighting purposes. Arc lamps may emit dangerous levels of UV radiation depending on their source type. 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. HBO 100W: 200 hrs. 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. Low-pressure mercury-vapor lamps[14] usually have a quartz bulb in order to allow the transmission of short wavelength light. The mercury in the tube is a liquid at normal temperatures. 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. 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. The lamps can be constructed to emit primarily in the UV-A (around 400 nm) or UV-C (around 250 nm). It continued in use in more specialized applications where a high intensity point light source wa… They also require a warm-up period of four to seven minutes to reach full light output. 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. In fact, the first British fluorescent lamps were designed to operate from 80-watt mercury vapor ballasts. The XLB series lamp ballasts are offered in 7 sizes from 150 to 6000 watts and are constant current sources designed for precision operation of short-arc Xenon lamps. In contrast, xenon arc lamps contain pure xenon gas. 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). Rated life of mercury arc lamps is as follows: HBO 50W : 100 hrs. Some bulbs include a thermal switch which shorts the starting electrode to the adjacent main electrode, extinguishing the starting arc once the main arc strikes. How do you use mercury arc lamp in a sentence? ), which has found application in modern compact projection devices. [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. 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. After a lamp has reached its rated life in hours, it should be inspected for cloudiness. What is the definition of mercury arc lamp? Mercury arc lamps are the workhorses of the curing industry. In the EU the use of low efficiency mercury vapor lamps for lighting purposes was banned in 2015. They operate at an internal pressure of around one atmosphere and require special fixtures, as well as an electrical ballast. 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 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. 16, 15:54: Rechtschreibfehler. To access this and other valuable technical resources, please sign in or register for a new online account. HXP lamps are short arc lamps in which the discharge arc burns in an atmosphere of mercury vapour at very high pressure. [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]. 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. Key Features and Benefits. 06, 01:13 The arc tube, made of quartz, contains mercury vapor, electrodes and a small amount of argon gas. The arc discharge is generally confined to a small fused quartz arc tube mounted within a larger borosilicate glass bulb. Mercury vapor lamp ballasts are similar to the ballasts used with fluorescent lamps. Mercury vapor lamps without any phosphor are second best; they produce only a few distinct mercury lines that need to be filtered out. Banned in 2015 vaporization of the light from being absorbed small amount of argon gas inks.! So such lamps are becoming obsolete due to mercury 's combination of spectral lines filter absorb. Stock to reduce lead times when ordering a replacement output from 120 to. 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