Electrodeless microwave uv lamps geometry, spectra, integrated reflectors for multi lamp microwave uv systems by vladimir danilychev uv quantum technologies, inc. However, only inductive discharges have been successfully exploited as a commercial lamp for general lighting purposes. A novel electrodeless discharge lamp coated with titania oxide anatase and placed in a microwave field directly in a bulk of suspension was used. Basic idea of multi lamp microwave uv light source. In the 1980s the subject of a lowwattage incandescent retrofit lamp was being extensively researched in the labs of philips and thorn lighting, both of whom created advanced prototypes that came very close to a market launch. Osa spatial distribution of radiant intensity from. A magnetron produces an electromagnetic field that is guided into place around a glass capsule, converting its contents into lightemitting plasma with pointsource distribution. An excitedstate faraday anomalous dispersion optical filter fadof has been demonstrated, which utilizes a rubidium electrodeless discharge vapor lamp rather than an external pump laser. Apr 09, 2020 his lamp looked like a large lightbulb and had strange greenish phosphors. There is strong uv emission from the plasma at 185 nm and 253 nm. Photocatalytic degradation of hydrogen sulfide using tio2.
Electrodeless discharge lamp matsushita electric works, ltd. The lamp design generally includes an amalgam and a cold chamber, or a cold spot to control the mercury vapor pressure and light output ansiies rp1610. The population ratio between the excited states is calculated according to the spontaneous transition probabilities with rate equations. The universal c2642unv electronic fluorescent ballast kit operates 2 26 watt cfl lamps at 120277 input volts. Smaller induction lamps for household use start at 7 usd as of 2012. The lamp gives over three times as much uv radiation as the conventional electrode lamp. Microwave discharge electrodeless lamps mdel part vii. The spatial distribution of radiant intensity from electrodeless discharge lamps edls used as radiation sources in atomic absorption spectrometry is investigated with a digital photodiode array imaging system. The rf source consists of that portion of the system up through the output matching circuitry but does not. Electrodeless lighting electrical contractor magazine. A novel mercuryfree dewarlike doublewalled structure microwave discharge thermallyinsulated electrodeless lamp mdtiel was fabricated and its performance evaluated using the photoisomerization of transurocanic acid transua in aqueous media as a test process driven by the emitted uv light when ignited with microwave radiation.
Featuring a thermally resistant case and efficient systems to promote lamp life, universal has brought a. Excitation coil for hid electrodeless discharge lamp. This is in contrast to a typical gas discharge lamp that uses internal electrodes connected to the power supply by conductors that pass through the lamp envelope. Distribution of populations in excited states of electrodeless discharge lamp of rb atoms springerlink. Estimation of the emission temperature of an electrodeless discharge lamp and determination of the oscillator strength for the i 2 p 32. This paper shows that with appropriate laser and lamp parameters, such a system appears to be possible and attractive. Recent citations low pressure mercury argon electrodeless fluorescent lamp simulation using the finite volume method. An electrodeless discharge lamp system includes an excitation coil placed in proximity of the electrodeless discharge lamp, a resonance circuit for supplying appropriate power to the excitation coil, and a high frequency power source driver and wherein, the combined output is achieved by operating the parallel connected power sources in synchronization or.
The low excitation threshold for mercury atoms means that even though the mercury is present in small concentrations, its behavior dominates. An electrodeless discharge lamp system includes an excitation coil placed in proximity of the electrodeless discharge lamp, a resonance circuit for supplying appropriate power to the excitation coil, and a high frequency power source driver and wherein, the combined output is achieved by operating the parallel connected power sources in synchronization or approximately in synchronization with. His lamp looked like a large lightbulb and had strange greenish phosphors. Determination of arsenic by atomic absorption spectrometry. Perkinelmer offers a full range of singleelement and multielement hollow cathode lamps and high intensity electrodeless discharge lamps for those elements for which they are more effective. An auxiliary electrode is disposed on or adjacent to an outer periphery wall of the lamp tube such that the auxiliary electrode is capacitively coupled to an interior space of the lamp tube. Ep0788140b1 electrodeless high intensity discharge lamp. Experimental investigation of electrodeless discharge. Electrodeless lamp article about electrodeless lamp by. Temperature and envelope materialdependent emission characteristics. Jun 28, 20 the results provide the potential applications of electrodeless discharge lamp in atomic filter and optical frequency reference at higher excited states without a pumping laser. Mercury hg electrodeless discharge lamp from perkinelmer.
Pinaacle instruments require the purchase of an edl driver assembly, part number 03030997, for each of the lamp positions to be used electrodeless discharge lamps for greater brightness edls are typically much brighter and, in some cases, provide better sensitivity than. The first practical electrodeless lamp appeared a short time later, and the technology continues to gain in popularity today due to its energy and maintenance. The other type of electrodeless lamp is the plasma lamp, which uses one or more gases, coupled with materials such as metallic halides, sodium or sulfur. An electrodeless discharge vapor lamp is employed to replace the rb vapor cell in a traditional faraday anomalousdispersion optical filter system.
Experimental techniques for evaluation of lamps all electrodeless discharge lamps were evaluated primarily with regard to their use as analytical sources for atomic fluorescence flame spectrometry, i. A qc team with more than 20 professional and technical personnel. The internal electrodeless lamp or induction lamp is a gas discharge lamp in which an electric or magnetic field transfers the power required to generate light from outside the lamp envelope to the gas inside. The french astronomer jean picard observed 1675 a faint glow in a mercurybarometer tube when it was agitated, but the cause of the glow. Performance evaluation of a novel microwave discharge granulated electrodeless lamp mdgelphotoassisted defluorination of perfluoroalkoxy acids in aqueous media. Determination of arsenic by atomic absorption spectrometry with an electrodeless discharge lamp as a source of radiation. At these temperatures the plasma radiates substantial visible light with a spectrum similar to sunlight. This model simulates an electrodeless lamp with argonmercury chemistry. Atomic absorption lamps perkinelmer has over 40 years of expertise designing and manufacturing lamps. Osa atomic population distribution of excited states in. Highfrequency electrodeless discharge lamps for atomic. The photocatalytic degradation of hydrogen sulfide h 2 s was examined with the tio 2 filmcoated reactor with a selfmade microwave electrodeless discharge lamp medl as the light source. Other articles where electrodeless lamp is discussed. An item from our full range of system 2 electrodeless dicharge lamps for 3100 spectrometer.
Intensity distribution over the radial and longitudinal sections of pb and hg lamps is measured for both atomic and ionic lines of the analyte and the filler gas. If the efficiency of discharge lamps could be increased by 1%, it would result in a saving of 10 9 kwh per year worldwide. These are sealed quartz tubes filled with inert gas at low pressure, much like hcl. The present invention relates to a radiofrequency rf coil for exciting a plasma discharge, and, more specifically, to a novel rf coil for exciting a visiblelightproducing plasma in a highintensity discharge hid electrodeless lamp and having a shape with reduced blockage of the luminous flux from the discharge lamp. Perkinelmer system 2 electrodeless discharge lamps edl. Highfrequency electrodeless discharge lamps hfedls are widely used as high intensity sources of narrow spectral lines, covering the spectrum from the vacuum ultraviolet to the infrared. Electrodeless discharge lamps are an ideal source for determining volatile elements. Electrodeless discharge lamps have several advantages compared to.
In principle, electrodeless lamps can be excited by three discharge mechanisms, i. Cadmium cd system 2 electrodeless discharge lamp perkinelmer. The internal electrodeless lamp or induction lamp is a gas discharge lamp in which an electric or magnetic field transfers the power required to generate light. Electric discharge lamp, lighting device consisting of a transparent container within which a gas is energized by an applied voltage and thereby made to glow. Perkinelmer system 2 edls consist of the element or a salt of the element sealed in a quartz bulb containing an inert gas atmosphere. A lossfree resistorbased versatile ballast for discharge lamps. Electrodeless discharge lamp fusion systems corporation.
The electrodeless discharge lamp with populations in excited states can be used to realize the frequency stabilization reference of the laser frequency standard. Abstract electrodeless discharge lamps have several advantages compared to lamps containing electrodes, including longer life, improved lumen maintenance, lamp efficacy, flexibility of lamp design, the use of chemical doses that would interact with electrodes, and improved electrical control. System 2 electrodeless discharge lamp for the detection of elemental cadmium cd. An electrodeless discharge lamp having an ultraviolet radiation transmission envelope containing a plasmaforming medium. Electrodeless lamp article about electrodeless lamp by the. The electrodeless flashlamp configuration offers both. The intensity of the medl light was largely dependent on the microwave mw output power. External core lamps are basically fluorescent lamps with magnetic cores wrapped around a part of the discharge tube. High frequency hf discharge electrodeless lamp hfdel, a typical uv light source, has been invented over 100 years and started to apply into the photolysis of organic compounds in solution and the irradiation of gases since 1970s 6. The filling material stabilizes a discharge of the luminescent material.
This is in contrast to a typical gas discharge lamp that uses internal electrodes connected to the power supply by conductors that pass. Universal triad c2642unv 2 lamp 26 watt cfl 120277 volt programmed start 0. Pdf highfrequency electrodeless lamps for application in atomic. The spectral output of the electrodeless discharge mercury lamp is known.
Highfrequency electrodeless lamps in argon mercury mixtures. Electrodeless discharge one of the kinds of ac electrical discharges in which energy is supplied without a contact and the circuit of the discharge current is completed. When an rf field of sufficient power is applied, the. But the high price of the technology remained a barrier to production. These electrodeless discharge lamps are preferred for certain volatile elements. The bulb contains a small quantity of the element of interest.
The envelope is formed from two different types of quartz, one of which blocks transmission of ultraviolet radiation 253 nm and shorter, and the other of which transmits radiation of 253 nm or shorter. Mercury hg system 2 electrodeless discharge lamp perkinelmer. Pdf the high frequency hf electrodeless lamps edl with different. Definition of electrodeless discharge merriamwebster.
An electrodeless discharge lamp includes a discharge gas sealed in a lamp tube. Hello fellow wikipedians, i have just added archive links to 2 external links on electrodeless lamp. While experimenting with highfrequency current, inventor nikola tesla developed an electrodeless lamp, but the concept remained largely unexplored for the next century except as a novelty lamp in the 1980s. Electrodeless discharge lamps edls have been demonstrated to be an intense source of halogen atomic emissions in the ultraviolet uv and far uv vuv. The discharge gas includes a halide of rare earth metal. Mercury electrodeless discharge lamps hgedls were used to generate uv radiation when exposed to a microwave field. Electric discharge lamp, also called vapour lamp, lighting device consisting of a transparent container within which a gas is energized by an applied voltage and thereby made to glow. Aug 26, 2014 light sources incandescent lamp discharge lamp florescent lamp sodium lamp high pressure mercury vapour lamp 3. They also have longer life than corresponding hcls hollow cathode lamp. Hfdel consisted of an hf power supply and electrodeless lamps. The electrode less discharge lamp uses an induction coil or energycoupling antenna.
Electrodeless discharge definition is a discharge produced in the neighborhood of a highfrequency alternating current under certain conditions through a gas contained in a closed tube without electrodes. They offer better precision and lower detection limits for analyses that are noisy due to weak hollow cathode emission. This lamp can also build esfadofs for submarine communication application in the bluegreen wavelength to simplify the system without the use of a pump laser. Distribution of populations in excited states of electrodeless discharge lamp of rb atoms. Its a new lighting source for the green lighting and energy was saving. An electrodeless discharge lamp 24 includes an envelope 8 filled with a luminescent material 9 to be excited to emit light and a filling material 10 that substantially does not discharge to emit light. The french astronomer jean picard observed 1675 a faint glow in a mercurybarometer tube when it was agitated, but the cause of the glow static electricity was not then understood. Electrodeless discharge article about electrodeless. Prices will drop and the light may become more popular as an alternative to higher priced led bulbs. Pinaacle instruments require the purchase of an edl driver assembly, part number 03030997, for each of the lamp positions to be used.
Electrodeless discharge lamp including impedance matching and. Dt is a discharge tube containing a rarefied gas, c is the capacitor of an oscillatory circuit, l is the inductance coil, and g is an electromagnetic oscillation generator. They are a class on electrodeless lamps, but not induction, which is a subclass of electrodeless. The intensity of fluorescence spectral lines of rb atoms in the region of 3501110 nm is measured in eletrodeless discharge lamp.
The induction lamp, a new source of visible and ultraviolet radiation. If specific atomic lines are desired, a small amount of the desired element is introduced in the discharge. The spectral characteristics of the electrodeless lamp resemble more those of highpressure mercury lamps. Hfedls have been used in various scientific devices such as emission and absorption spectrometers, spectrometers for refractive index measurements, frequency. Atomic spectra from rf electrodeless discharge sources for uv. Electrodelessdischargevaporlampbased optical atomic. Light sources incandescent lamp discharge lamp florescent lamp sodium lamp high pressure mercury vapour lamp 3. Electrodeless discharge lamps edls electrodeless discharge lamp edls are line sources that provide radiant energy that has a greater intensity than hcl.
Mar 24, 1987 an electrodeless discharge lamp comprising an ultraviolet radiation transmissive envelope containing a plasmaforming medium, said envelope comprising a first ultraviolet transmissive portion and a second ultraviolet transmissive portion, said first ultraviolet transmissive portion comprising quartz which blocks transmission of substantially. Concretely, for a given discharge lamp type, higherpower bulbs usually have better efficacy. At the same time, the population density of energy level is also obtained. Ideal for use in normal light areas, this programmed rapid start ballast is typically used in offices, board rooms, and retail. Radiation sources atomic absorption spectroscopy learning. A novel electrodeless discharge lamp coated with titania oxide anatase and placed in a microwave field directly in a bulk of suspension was used to generate uvvis radiation. At the time of writing led units were more expensive to produce than induction lamps, that could change however.
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