Excimer laserinduced fragmentation fluorescence elif spectroscopy has been introduced for monitoring of alkali compounds and lead vapors in power plant boilers and in combustion flames 12. Pdf measurement of polystyrene nanospheres using excimer. Elif e xcimer l aser induced fragmentation fluorescence. The detection of atomic pb emission from solid pbno 3 and pbno 3 mixed into a soil, by excimer laser fragmentation fluorescence spectroscopy elffs using a 193 nm arf excimer laser, was discussed. Carbon atom fluorescence at 248 nm and the na dline at 589 nm are used as signatures of soot and nacl, respectively. Article information, pdf download for laserinduced photofragmentation fluorescence imaging of. Lucas, detection of lead in soil with excimer laser fragmentation fluorescence spectroscopy, appl. Preparatory study for detection of nickel in industrial flue gas by excimer laserinduced fragmentation fluorescence spectroscopy. Excimer laser fragmentationfluorescence spectroscopy elffs is shown to be an effective detection strategy for ammonium nitrate and ammonium sulfate particles at atmospheric pressure and room. Gertler, an assessment of motor vehicle particulate matter emissions measurements th international scientific symposium on transport and air pollution, boulder, colorado, september 15 2004. We report in situ, realtime detection of soot particles coated with nacl using excimer laser fragmentation fluorescence spectroscopy elffs.
Patents james jz, crosby, js, lucas d, koshland cp. Spectroscopy of ions and their clusters 0 n terry a. Lead exposure and intelligence in 7yearold children. Soot particle disintegration and detection by twolaser. Following photofragmentation of the ammonium salt particle, fluorescence of the nh fragment is observed at 336 nm. However, a more comprehensive approach is to derive a pdf transport equation that may be. National institute of environmental health sciences. Characterization of diesel particulate matter with excimer. Excimer laserinduced fragmentation fluorescence elif spectroscopy has been introduced for monitoring of alkali compounds and lead vapors.
Laserbased diagnostic techniques in single particle analysis. The elffs detection limit for soot is 40 ppt in cooled combustion exhaust. Excimer laser fragmentationfluorescence spectroscopy elffs is shown to be an effective detection strategy for ammonium nitrate and ammonium sulfate particles at atmospheric pressure and room temperature. However, the technique struggles to identify the precursor of emitting photodissociation products induced by the laser pulse. In situ, realtime detection of soot particles coated with. Measurement of polystyrene nanospheres using excimer laser fragmentation fluorescence spectroscopy article pdf available in applied spectroscopy 5910. Excimer laser fragmentation fluorescence spectroscopy elffs is used to monitor lead in soil sample and investigate lasersolid interactions.
History and future prospects of excimer laser technology. Two separate 20 ns laser pulses irradiate combustiongenerated soot nanoparticles with 193 nm photons. Ramanujam, fluorescence spectroscopy of neoplastic and nonneoplastic. Measurement of polystyrene nanospheres using excimer laser. With a homogeneous beam profile and energystabilization, they.
Uv fluorescence analyzer all industrial manufacturers. Excimer laser fragmentationfluorescence spectroscopy elffs can provide continuous, reallime monitoring information for metals which evolve from a variety of hightemperature processes. Uvlaserbased method of measuring of gaseous alkaline compounds for example naci, naoh, kci, koh. Multiwavelength monitoring of photofragment fluorescence. Choi j, damm c, odonovan n, sawyer r, koshland c and lucas d 2016 detection of lead in soil with excimer laser fragmentation fluorescence spectroscopy, applied spectroscopy, 10. An experimental system has been developed wherein a pulsed laser beam photofragments molecules of a gaseous sample introduced into a vacuum chamber. Abstract excimer laser fragmentationfluorescence spectroscopy is an effective detection strategy for nh 3 in combustion exhausts at atmospheric pressure and high temperatures. Additional dilution downstream of the flame allows us to generate particle concentrations spanning those produced. Localized surface plasmon resonance mercury detection system and methods.
Excimer laser fragmentation fluorescence spectroscopy elffs is an effective technique for monitoring diesel particulate matter in engine exhaust. Gordon research conference on laser diagnostics in combustion, oxford, england, august, 2003. Detection of lead in soil with excimer laser fragmentation fluorescence spectroscopy elffs. Laser ablation of surfaces normally produce high temperature plasmas that are difficult to control. National institute of environmental health sciences superfund basic research program. Optical remote sensing for environmental and process monitoring. Measurement of polystyrene nanospheres using excimer laser fragmentation fluorescence spectroscopy. Applied spectroscopy 1207 laser photolysis of other polymer. Elif excimer laser induced fragmentation fluorescence is a technique used for analysis of alkali metal compounds. Excimer laser fragmentation fluorescence spectroscopy elffs fragments soot particles with 193 nm photons to produce excited carbon atoms that emit at 248 nm. Twophoton photofragmentation of nh 3 with 193nm light yields emission from the nh a x band at 336 nm. Lucas mechanical engineering department, university of.
Application of fluorescence spectroscopy for microbial detection to enhance clinical. Muzio in situ monitoring of toxic metal emissions using excimer laser 102 fragmentationfluorescence spectroscopy steven g. Ega evolved gas analysis insitu evolved gas analysis in. By a enuating the intensity of the laser beam from a pulsed laser, the mean number. Excimer laser fragmentation fluorescence spectroscopy. Also not polar molecules like h2 or n2 are measurable. Highenergy photon beams fragment the contaminants that can then be optically detected by laserinduced fluorescence. When the particle concentration is high, laser fragmentation rather than laser. By adjusting the flow rates of air, methane, and nitrogen in the fuel, the mean electric mobility diameter and number concentration are varied.
Metal emissions monitoring using excimer laser fragmentationfluorescence spectroscopy steven g. Pollutant detection in stack gases using laser raman spectroscopy 81. Nanoparticle production by uv irradiation of combustion. Detection of lead in soil with excimer laser fragmentation fluorescence spectroscopy. Pure lead nitrate salt and soil doped with lead nitrate are photolyzed with 193 nm light from an arf excimer at fluences from 0. Pdf application of fluorescence spectroscopy for microbial.
A twolaser technique is used to study laserparticle interactions and the disintegration of soot by highpower uv light. Laser photolytic fragmentationfluorescence spectrometric. Studies of emission by photoproducts of the excimer laser photolysis of nitromethane at 193 nm are reported here. Pdf fluorescence spectroscopy represents an universal method and very useful.
Mlase excimer laser mli series these compact standalone uv lasers offer the bestlife times and reliability available on the market. Important performance parameters for solar pv systems conversion efficiency what percentage of incident power is converted to electrical power 15 percent is typical peak watt rating for a module this is a lab measurement at a low cell temperature nominal operating cell temperature notc watt rating for a module expected energy output for a given time period. Sawyer, and donald lucas applied spectroscopy 2005 59. Pdf soot particle disintegration and detection by two. Soot particle disintegration and detection by two laser excimer laser fragmentation fluorescence spectroscopy article pdf available in applied optics 4431. Using excimer laser fragmentation fluorescence, proceedings of the combustion institute, vol 2 pp. Evaluation of lubricating properties of diesel based fuels. Optical remote sensing for environmental and process. Laserinduced photofragmentation fluorescence imaging of alkali.
An arf excimer laser, providing pulses of wavelength. The researchers are applying excimer laser fragmentation fluorescence spectroscopy elffs technology. Its measuring principle is based on a simultaneous cleavage of molecules, and excitation of the respective alkali atom by a vuvlaser. Detection of lead in soil with excimer laser fragmentation.
Inverted coflow diffusion flame for producing soot. Laser measurement of kcl vapor in 4 mw cfb boiler during. Measurement of polystyrene nanospheres using excimer laser fragmentation fluorescence spectroscopy jong hyun choi, catherine p. Excimer laser production, assembly, sintering, and fragmentation. Raman excitation plus laserinduced electronic fluorescence. Fluorescence of the fragments so produced is observed. Elif excimer laser induced fragmentation fluorescence gas concentration of alkali components. Find your uv fluorescence analyzer easily amongst the 41 products from the leading brands environnement s. Excimer laser fragmentationfluorescence spectroscopy as a. Generation of agcl cubes by excimer laser ablation of bulk ag in aqueous nacl solutions. Excimer laser fragmentation fluorescence spectroscopy, proceedings of the combustion institute 29, 2767 2774 2002, presented at the 29 th international symposium on. Here, we irradiate soot with 193 nm light from an arf excimer laser. The technique uses excimer laser fragmentation fluorescence spectroscopy to detect and quantify multiple components in combustion exhausts avakian et al. Measurements were made in the exhaust of a singlecylinder, 4 kw diesel generator with several different air to exhaust dilution ratios.