A novel environmental risk free microwave discharge electrodeless lamp mdel in advanced oxidation processes. Induction high bay fixture,electrodeless lamp,lvd flood. Discharge lamp definition of discharge lamp by merriam. The spectral characteristics of the electrodeless lamp resemble more those of highpressure mercury lamps. Fluorescent lamps are low pressure discharges, operating at an electron temperature of 12ev.
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. 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. The uv emission can stimulate phosphors coated on the surface of the bulb. The spectral output of the electrodeless discharge mercury lamp is known. The electrode less discharge lamp uses an induction coil or energycoupling antenna without electrodes, which use the application of lowpressure gas discharge. 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. A lossfree resistorbased versatile ballast for discharge. 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. If specific atomic lines are desired, a small amount of the desired element is introduced in the discharge. Pdf a novel environmental riskfree microwave discharge. External core lamps are basically fluorescent lamps with magnetic cores wrapped around a part of the discharge tube. How does it work the high frequency electrodeless discharge lamp is made of three parts. It may come back into the public eye as it is improved.
Electrodeless lowpressure discharge lamp having a glass lamp vessel 1 which is sealed in a gaastight manner and which is filled with at least a metal vapor and a rare gas, said lamp having a first winding 6 which is connected to a highfrequency electric power supply unit and which generates an electric discharge in the lamp vessel 1, one of the supply wires of the first winding being. Low pressure mercuryargon electrodeless fluorescent lamp. 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 advantages. The internal electrodeless lamp or induction lamp is a gas discharge lamp in which an electric. 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. However, only inductive discharges have been successfully exploited as a commercial lamp for general lighting purposes. This is in contrast to a typical gas discharge lamp that uses internal electrodes connected to the power supply by conductors that pass. The photodegradation of organic dye rhodamine b rhb in an aqueous solution was studied using a microwave electrodeless uv lamp mwuvl. Photodegradation of rhodamine b dye using a microwave. Other advantages of the electronic ballasts are that the light is flickerfree and there is the opportunity of. This function is provided by a dimmer control unit which may be in an analog or digital form and may respond to a control signal provided by a potentiometer, a. Atomic absorption lamps perkinelmer has over 40 years of expertise designing and manufacturing lamps. In operation the gas is ionized and free electrons, accelerated by the electrical field. Standard spectrophotometer cells 10 cm long with quartz end windows may be used.
Apr 09, 2020 his lamp looked like a large lightbulb and had strange greenish phosphors. New patent cd for electrodeless ultraviolet discharge. Discharge lamp definition of discharge lamp by the free. May 21, 1996 it should be appreciated that, according to the foregoing electrodeless discharge lamp, the annular or continuous stringshaped preliminary discharge can be generated with the application of the high frequency voltage to the single type auxiliary electrode, and its shift to the electrodeless discharge d a is rendered easier.
Electrodeless lighting electrical contractor magazine. Highfrequency electrodeless discharge lamps for atomic. An acidic condition was preferred for the degradation of rhb. If the efficiency of discharge lamps could be increased by 1%, it would result in a saving of 10 9 kwh per year worldwide. In principle, electrodeless lamps can be excited by three discharge mechanisms, i. 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. Highfrequency electrodeless discharge lamps hfedls are widely used as sources of intensive atomic spectral lines in atomic emission and absorption spectroscopy 1. The lamp gives over three times as much uv radiation as the conventional electrode lamp. Perkinelmer n3050657 lead system 2 electrodeless discharge. Electrodeless discharge lamp including impedance matching and. 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.
The bulb contains a small quantity of the element of interest. The induction lamp, a new source of visible and ultraviolet radiation. When an rf field of sufficient power is applied, the. Radiation sources atomic absorption spectroscopy learning. Electrodeless lamp article about electrodeless lamp by.
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. This paper presents a versatile ballast for discharge lamps, whose operation is based on the notion of a loss free resistor lfr. Any multirange variablespeed recorder that is compatibl e with the uv detection system is suitable. The luminous efficacy of the endura is comparable to that of fluorescent lamps. Perkinelmer system 2 edls consist of the element or a salt of the element sealed in a quartz bulb containing an inert gas atmosphere. Us20020047615a1 electrodeless discharge lamp system. Inductive lighting electrodeless lamp the talk page discussion reveals that electrodeless lampis the correct common title for this page the preceding unsigned comment was added by gerben49 talk contribs 30 june 2005, 21. Electrodeless lamp article about electrodeless lamp by the.
The pfc acts as a controlled power source and provides mid and longterm stability to the system, while the stability of the current through the lamp is. Electrodeless discharge definition of electrodeless. From an electrical point of view, the lamp can be thought of as a transformer, where the coil acts as the primary and the plasma acts as the secondary. Atomic spectra from rf electrodeless discharge sources for. Effect of xenon pressure and plasma parameters on luminance since there is much concern about. 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. His lamp looked like a large lightbulb and had strange greenish phosphors. 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. This paper presents the design, control strategy and experimental results of a twostep, power factor correction stage pfc and resonant inverter ri, electronic ballast proposal to supply 150 w electrodeless fluorescent lamps efl. Microwave discharge electrodeless lamps mdel part vii. N3050675 tin sn electrodeless discharge lamp analytics.
Introduction the electric discharge lamp is one of the most important plasma devices today. A qc team with more than 20 professional and technical personnel. But the high price of the technology remained a barrier to production. Hfedls have been used in various scientific devices such as emission and absorption spectrometers, spectrometers for refractive index measurements, frequency. Discharge lamp definition is an electric lamp in which an enclosed gas or vapor glows or causes a phosphor coating on the lamps inner surface to glow. Lumina hollow cathode and electrodeless discharge lamps. These are sealed quartz tubes filled with inert gas at low pressure, much like hcl. 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. An electrodeless discharge borosilicate glass lamp. Safe driving from start to finish with bright flickerfree light and extremely. The discharge gas includes a halide of rare earth metal. In one embodiment the highfrequency signal delivered to the induction coil is interrupted during a predetermined portion of a full duty cycle. Singleuse syringes 10 ml, luer approach, individually sterile packed, 100 pcpak. Perkinelmer n3050657 lead system 2 electrodeless discharge lamp, 2 o.
It is a further object of the invention to provide a mercury free electrodeless high intensity discharge lamp having a boron sulfidebased fill including a small. New patent cd for electrodeless ultraviolet discharge fluid remediation. 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. Electrodeless lamp lighting systems utilizing the sulfur based bulb type developed by.
A lossfree resistorbased versatile ballast for discharge lamps. 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. An arrangement for adjusting the intensity of an electrodeless discharge lamp is described. A device that generates light by means of an internal electrical discharge between electrodes in a gas. The 185 nm vacuum uv vuv intensity of the mwuvl amounted to 12% of the total uv output, about 1. Dec 11, 1990 electrodeless lowpressure discharge lamp having a glass lamp vessel 1 which is sealed in a gaastight manner and which is filled with at least a metal vapor and a rare gas, said lamp having a first winding 6 which is connected to a highfrequency electric power supply unit and which generates an electric discharge in the lamp vessel 1. Electrodeless lamp lighting systems utilizing the sulfur based bulb type developed by fusion lighting, inc. Request pdf mercuryfree electrodeless discharge lamp.
Other articles where electrodeless lamp is discussed. 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 comparable hcls. 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. When the power goes through the high frequency power supply generator, it creates a 2. Induction high bay fixture,electrodeless lamp,lvd flood light. Note multielement lamps are not designed to be used with furnace systems.
A novel environmental riskfree microwave discharge electrodeless lamp mdel in advanced oxidation processes. System 2 electrodeless discharge lamp for the detection of elemental cadmium cd. A new flat dark discharge lamp for backlight applications based on electron. Electrodeless discharge article about electrodeless. Electrodeless lowpressure discharge lamp free patents online. Electrodeless discharge lamps edls electrodeless discharge lamp edls are line sources that provide radiant energy that has a greater intensity than hcl. Suitable cells may be constructed from plexiglass tubing, 1 in. A novel mercury free 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 ign. 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.
It is a further object of the invention to provide a mercuryfree electrodeless high intensity discharge lamp having a boron sulfidebased fill including a small. Every genuine perkinelmer lumina lamp is designed for use with and tested on our spectrometers to assure compatibility and the highest performance. Temperature of an electrodeless discharge lamp and determination of the oscillator strength for the i2p32 183. 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. They offer better precision and lower detection limits for analyses that are noisy due to weak hollow cathode emission. This paper presents a versatile ballast for discharge lamps, whose operation is based on the notion of a lossfree resistor lfr.