Results 211 to 220 of about 17,184 (237)
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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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Plant growth depression by selective irradiation of the meristem with CO2 and diode lasers
Biosystems Engineering, 2008The application of CO2 and diode lasers as an alternative thermal method for the non-chemical control of weeds is investigated. Under laboratory conditions, experiments were carried out on the interaction of laser light with mono- and dicotyledonous plants represented by Echinochloa crus-galli and Nicotiana tabacum.
C. Wöltjen +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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Acta oto-rhino-laryngologica Belgica, 2002
Our study encompasses 61 patients (49 men--80.3%; 12 women--19.7%) treated from September 1998 through August 2001. Mean follow-up covers 25 months (range: 7-43 months). Our CO2-LAUP technique involves vaporizing the palatine mucosa along a rectangular surface from the palatal dimple to the base of the uvula; trimming the palatine arches under the ...
M, Remacle +3 more
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Our study encompasses 61 patients (49 men--80.3%; 12 women--19.7%) treated from September 1998 through August 2001. Mean follow-up covers 25 months (range: 7-43 months). Our CO2-LAUP technique involves vaporizing the palatine mucosa along a rectangular surface from the palatal dimple to the base of the uvula; trimming the palatine arches under the ...
M, Remacle +3 more
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Diode Laser Absorption Sensor Design and Qualification for CO2 Hypersonic Flows
Journal of Thermophysics and Heat Transfer, 2011The design of a diode laser absorption spectroscopy sensor to probe freestream conditions of hypervelocity CO2 flow in the Longshot Free-Piston Facility is presented. The Longshot Facility of the von Karman Institute is an important facility for ground test and numerical validation applications as it can produce high Mach number and highReynold’s ...
Jason M. Meyers, Doug Fletcher
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Journal of Molecular Spectroscopy, 1990
Abstract Heterodyne spectra of carbonyl sulfide have been obtained with saturation in a CO 2 waveguide laser and without saturation with a diode laser. The absolute uncertainties of the measured positions lie between 10 −4 and 7 × 10 −6 cm −1 . The CW submillimeter laser line of OCS at 378 μm has been assigned to the J = 65 → 64 transition in ...
A. Fayt +4 more
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Abstract Heterodyne spectra of carbonyl sulfide have been obtained with saturation in a CO 2 waveguide laser and without saturation with a diode laser. The absolute uncertainties of the measured positions lie between 10 −4 and 7 × 10 −6 cm −1 . The CW submillimeter laser line of OCS at 378 μm has been assigned to the J = 65 → 64 transition in ...
A. Fayt +4 more
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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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A Comparative Study of High-Power Diode Laser and CO2 Laser Surface Hardening of AISI 1045 Steel
Journal of Materials Engineering and Performance, 2014Zhuguo Li, Li Ruifeng, Qi Kai
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