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Showing 1 to 20 of 34 for “"Ring down."”.
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Pulsed cavity ring-down spectroscopy in combustion environments
Contains fulltext : 19193_pulscaris.pdf (Publisher’s version ) (Open Access)
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Pulsed ring-down antennas for implementation in a phased array
… compactness for field application. The pulsed ring-down antenna has become of great interest due to its compact size and peak power on target potential. A pulsed ring-down antenna operates by charging the single element antenna with a high potential source and then closing a switch to develop …
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Continuous-wave cavity ring down spectroscopy sensor for Hall thruster erosion measurement
… its development in future applications requiring a long operational time (several thousands of hours). Sputter erosion of boron nitride (BN) acceleration channel wall is principal lifetime limitation for Hall thrusters. The sputtered particles can redeposit causing a critical contamination …
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Entwicklung eines breitbandigen Cavity-Ring-Down-Spektrometers unter Verwendung nahinfraroter, inkohärenter Strahlung
… ist ein spektral breitbandiges Cavity-Ring-Down-Spektrometer (CRD-Spektrometer). Ausgangspunkt der hier vorgestellten Arbeit ist ein Spektrometer auf Basis klassischer Absorptionsspektroskopie in einer Multireflexionszelle. Für dieses Spektrometer wurde als Strahlquelle ein …
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Indirect Detection of Explosive Vapours by Thermal Dissociation Cavity Ring-Down Spectroscopy
… technique exploited radicals generated during the thermal decomposition of triacetone triperoxide (TATP), a peroxide explosive, for detection. These radicals were amplified via a peroxide radical chemical amplification scheme (PERCA) that required the addition of NO and a radical chain …
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Cavity ring down and thermal lens techniques applied to vibrational spectroscopy of gases and liquids.
… fast time response. In this dissertation cavity ring down (CRD) absorption of oxygen around the region 760 nm has been used to measure the temperature of flowing air in an open optical cavity. This sensor could be a convenient method for measuring the temperature at the input (cold air) and …
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Characterisation of a Cavity Ring-Down Spectrometer for measuring CO2, CH4, delta13CO2, and delta13CH4 in ambient air
… identifying their sources and sinks. The Cavity Ring-Down Spectrometer (CRDS) G2201-i measures 12CO2, 13CO2, 12CH4, 13CH4, and H2O continuously and simultaneously in a gas sample. In this thesis, the CRDS G2201-i has been installed in Heidelberg for routine ambient air analysis and for …
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Cavity ring down: Construction, validation and experiments measuring the optical extinction of pure clays and their mixtures with salts and carboxylic acids under a range of atmospherically relevant conditions
… interact directly with solar radiation by scattering and absorbing incident light to affect the Earth's climate system. Models indicate that aerosols cool the Earth counterbalancing greenhouse gases, but contribute the largest uncertainty to anthropogenic effects on climate. To address these …
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Entwicklung und Optimierung absorptionsspektroskopischer Techniken zur Untersuchung von Verbrennungsprozessen
… ermöglichen. Neben der hochsensitiven Cavity Ring-down Spektroskopie wird auch die direkte Absorptionspektroskopie eingesetzt. Die Erschließung des mittleren infraroten Spektralbereichs für die Flammendiagnostik bietet hierbei Zugang zu Molekülen, welche bisher nicht nachgewiesen werden …
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Spectroscopic investigations of the X and A state dynamics of ¹³C₂H₂
… (LIF), Dispersed Fluorescence (DF), Cavity Ring-Down Spectroscopy (CRDS), Noise Immune Cavity Enhanced Optical Heterodyne Molecular Spectroscopy (NICE-OHMS) and Stimulated Emission Pumping (SEP) are employed to study the spectroscopy and dynamics of acetylene. All of these experiments focus …
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Instrument development for exploring the influence of interfacial chemistry on aerosol growth, aging, and partitioning of gases
… rotating aerosol suspension chamber with cavity ring-down spectroscopy provided key insight into the effect of pollutants and other vapors on the overall atmospheric lifetime of particulate matter. The Atmospheric Cloud Simulation Instrument (ACSI) creates a well-defined and controllable …
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Laser-induced plasmas in air for pulsed broadband cavity-enhanced absorption spectroscopy
… azulene through (i) time-dependent cavity ring-down (CRDS), and (ii) intensity-dependent incoherent broadband cavity-enhanced absorption spectroscopy (IBBCEAS) methodologies. Based on the broadband ring-down time of light within the cavity, cavity mirror reflectivities may be calibrated in …
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Supercontinuum radiation for ultra-high sensitivity liquid-phase sensing
… a time-resolved variant called broadband cavity ring-down spectroscopy (BB-CRDS), was successfully developed. Use of a novel single-photon avalanche diode (SPAD) array enabled the simultaneous detection of ring-down events at multiple spectral positions for BB-CRDS measurements. The performance …
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Dynamics of Small Elastic Systems in Fluid: Tension and Nonlinearity
… which is computed from the deterministic ring down. This agreement is shown across different fluids (air and water), and for multiple measuring points including at the beam midpoint and the quarter point. In addition to exploring the linear dynamics of these systems, the case of large …
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The Elements of Catholicism in the Plays of Philip Massinger
… play of a vanishing glory before the Puritans ring down the curtain on the epilogue of the greatest literary spectacle of the ages—the Elizabethan Drama. A century and a half will elapse before Massinger returns for his curtain call in that spotlight of popularity where his own age had held …
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Tunable and broadband loop gap resonator for nitrogen vacancy centers in diamond
… Fields up to 14 gauss. Furthermore, with cavity ring-down-times in the single nanoseconds, the resonator is compatible with the pulsed MW techniques necessary for a wide range of NV-diamond applications.
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Development, Validation, and Application of Methods for High Time-Response Measurement of Gaseous Atmospheric Chlorinated Species
… We configured a commercial HCl cavity ring-down spectrometer (CRDS) for sampling HCl in the ambient atmosphere and developed validation techniques to characterize the measurement uncertainties. The HCl analyzer was used to make continuous HCl measurements in the polluted marine boundary …
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Methane Dynamics in St. Louis Bay, Mississippi
… methane analysis was developed utilizing cavity ring-down spectroscopy and headspace equilibration. Samples of 70 mL were collected in 140 mL plastic syringes and equilibrated with a methane free headspace. Reproducibility was high (i.e. 4% typical RSD), and samples were successfully measured in …
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Geographic Classification of Wines Using Their Elemental and Water Isotopic Composition; Special Emphasis on Washington State, USA
… Plasma Mass Spectrometry (ICP-QQQ) and Cavity Ring-Down Spectroscopy, respectively. Linear discriminant analysis resulted in successful regional and continental classification, with 97.5% and 99.2% correct assignments, respectively. WA and California wines were significantly different from each …
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Aircraft-based measurements for the identification and quantification of sources and sinks in the carbon cycle
… platform equipped with a high-precision cavity ring-down spectrometer for CO<sub>2</sub>, CH<sub>4</sub> and H<sub>2</sub>O quantification was used to acquire data from previously un-sampled sources. The aircraft mass-balance technique was used to quantify CH4 emissions from natural gas well …
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