Results 281 to 290 of about 227,483 (326)
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Chemical Physics Letters, 1986
Infrared diode laser spectroscopy was applied to the detection of CF2 carbene produced by CO2-laser-induced dissociation of CHClF2. Time-resolved spectra of CF2 in several rotation-vibration states were observed. The initial concentration of CF2 was estimated to be 5 × 1016 molecules cm−1 from an analysis of the time-resolved spectra.
Ko-ichi Sugawara +3 more
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Infrared diode laser spectroscopy was applied to the detection of CF2 carbene produced by CO2-laser-induced dissociation of CHClF2. Time-resolved spectra of CF2 in several rotation-vibration states were observed. The initial concentration of CF2 was estimated to be 5 × 1016 molecules cm−1 from an analysis of the time-resolved spectra.
Ko-ichi Sugawara +3 more
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Performance comparison of CO2 and diode lasers for deep-section concrete cutting
Thin Solid Films, 2004Abstract Layer-by-layer laser machining with mechanical removal of vitrified dross between passes is a new technique with a demonstrated capability for deep-section cutting, not only of concrete, but of ceramic and refractory materials in general. For this application fairly low power densities are required. A comparison of experimental results using
Philip L. Crouse +2 more
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Diode laser spectroscopy of carbon and oxygen stable isotopes in CO2
Optical Society of America Annual Meeting, 1991Using tunable diode lasers it is possible to resolve individual rovibrational spectral lines within the vibrational bands of carbon dioxide and measure their absorbance. These measurements can be used to determine CO2 gas concentration and isotopic ratios of 13C/12C and 18O/16O.
Todd B. Sauke +4 more
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Measurements of sulfur compounds in CO2 by diode laser atomic absorption spectrometry
Spectrochimica Acta Part B: Atomic Spectroscopy, 2003Abstract Two simple methods for the analysis of the total concentration of sulfur in CO2 by diode laser atomic absorption spectrometry of excited, metastable sulfur atoms in a direct current discharge are presented. In the first method, the CO2 sample gas is mixed with the plasma gas (Ar or He) while the second is based on reproducible measurements ...
Franzke, J, Stancu, D.G, Niemax, K
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Diode Laser Absorption Measurements of Free Stream Hypervelocity CO2 Flow at 1.6µm
41st AIAA Thermophysics Conference, 2009High-speed tunable diode laser absorption spectroscopy (TDLAS) was developed using an external cavity diode laser operating in the near infra-red to monitor CO2 in the Longshot impulse hypervelocity facility at the Von Karman Institute for Fluid Dynamics (VKI). The light source selected was a tunable external cavity diode laser (ECDL) near 1600nm where
Jason Meyers, S Paris, D Fletcher
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Anode heating in an intense ion beam diode with a CO2 laser
Applied Physics Letters, 1984In order to accelerate intense ion beams, we heat the anode of a pinch-reflex diode with a CO2 laser. At laser power densities of 1010 W/cm2 over a 2-mm focal spot, we demonstrate that gap closure is avoided and that ion efficiency is increased by at least a factor 3 over diode operation without the laser.
N. Camarcat +3 more
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Photoacoustic CO2 sensor based on a DFB diode laser at 2.7 μm
The European Physical Journal Special Topics, 2008We present a new detection scheme for carbon dioxide (CO2) based on a custom-made room temperature distributed feedback (DFB) diode laser at 2.7 μm, currently representing one of the lasers with the highest emission wavelength of its kind. The detector's especially compact and simple set-up is based on photoacoustic spectroscopy (PAS).
M. Wolff +3 more
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Review of Scientific Instruments, 2001
A diode laser sensor was developed to measure CO2 concentration using absorption spectroscopy at 2 μm. The simplicity of the optical setup and detection electronics makes this spectrometer very compact and well suited for field studies, while the use of optical fibers enables one to probe remote environments.
Gagliardi G +5 more
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A diode laser sensor was developed to measure CO2 concentration using absorption spectroscopy at 2 μm. The simplicity of the optical setup and detection electronics makes this spectrometer very compact and well suited for field studies, while the use of optical fibers enables one to probe remote environments.
Gagliardi G +5 more
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Diode-laser absorption measurements of CO2, H2O, and N2O near 2 μm
Laser Applications to Chemical, Security and Environmental Analysis, 1998A tunable external-cavity diode laser (ECDL) operating near 2.0 μm was used to perform absorption measurements of CO2, H2O, and N2O in a heated static cell at various pressures (15 - 760 torr) and temperatures (294 K - 1460 K). The present work represents an extension of previous diode-laser absorption measurements of weaker vibrational overtones near ...
R. M. Mihalcea +3 more
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Diagnostics of a fast-axial-flow CO2 laser active medium using a diode laser spectroscopy technique
SPIE Proceedings, 1994waveguide CO2 lasers 3.Fast-axial-flow CO2 lasers are very effective systems with output power from several hundredsW to several kW, and they have a good quality of output beam. Furthermore, these systems are rathersimply designed and relatively cheap.
Maxim Spiridonov +2 more
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