Search results for "diode laser"

showing 3 items of 23 documents

Volcanic CO2 flux measurement at Campi Flegrei by tunable diode laser absorption spectroscopy

2014

Near-infrared room-temperature Tunable Diode Lasers (TDL) have recently found increased usage in atmospheric chemistry and air monitoring research, but applications in volcanology are still limited to a few examples. Here, we explored the potential of a commercial infrared laser unit (GasFinder 2.0 from Boreal Laser Ltd) for measurement of volcanic CO2 mixing ratios, and ultimately for estimating the volcanic CO2 flux. Our field tests were conducted at Campi Flegrei near Pozzuoli, Southern Italy, where the GasFinder was used during three campaigns in October 2012, January 2013 and May 2013 to repeatedly measure the path-integrated mixing ratios of CO2 along cross-sections of the atmospheric…

geographygeography.geographical_feature_categoryTunable diode laser absorption spectroscopyVolcanic CO2 fluxesFar-infrared laserMineralogyVolcanologyLaser7. Clean energyFumaroleSettore GEO/08 - Geochimica E Vulcanologialaw.inventionTunable diode lasers Atmospheric CO2 monitoring Volcanic CO2 fluxes Campi FlegreiAtmosphereVolcanotunable diode lasers atmospheric CO2 monitoring volcanic gas sensing by laser spectroscopy volcanic CO2 fluxes Campi Flegrei13. Climate actionGeochemistry and PetrologylawAtmospheric chemistryAtmospheric CO2 monitoringTunable diode lasersCampi FlegreiGeologyRemote sensingBulletin of Volcanology
researchProduct

Volcanic CO2 measurements at Campi Flegrei by Infrared Tunable Diode Laser absorption Spectroscopy

2014

Gas studies add information for the interpretation of fluid circulation dynamics at dormant volcanoes and can contribute to eruption forecasting. Direct in-situ and remote-sensing techniques were used in order to improve volcanic gas monitoring, essential for hazard assessment. In the last decades, near-infrared diode lasers have increasingly been used in atmospheric research and, though in an experimental phase, are now finding applications in volcanic gas studies. The Tunable Diode Laser Spectroscopy technique (TDLS) relies on measuring the absorbance at specific wavelengths due to the absorption of IR radiation by a target gas. Here, we report on the application of the GasFinder 2.0, an …

hazard assessmenttunable diode laserlaser spectroscopyCampi Flegreivolcanic CO2 fluxevolcanic gas sensing
researchProduct

Twenty Years of Airborne Water Vapor and Total Water Measurements of a Diode Laser Based Photoacoustic Instruments

2020

We present relevant issues collected over twenty years of development and operation of an airborne water vapour / total water detector based on photoacoustic spectroscopy. The WaSulHygro instrument possesses high selectivity, short response time, and wide dynamic range, that are key requirements against trace gas measurement systems for applications in atmospheric sciences. Besides the major properties of WaSul-Hygro we discuss our efforts to develop a robust instruments that have proved its long-term reliability over the last fifteen years operating on-board a commercial aircraft within the framework of the CARIBIC project.2

instrument developmentMaterials Science (miscellaneous)BiophysicsGeneral Physics and Astronomy01 natural scienceslaw.inventiondiode laserlaw0103 physical sciencesWide dynamic rangePhysical and Theoretical Chemistry010306 general physicsairborne measurementsPhotoacoustic spectroscopyMathematical PhysicsRemote sensingSystem of measurementhumidityHumidityLaserlcsh:QC1-999Trace gasWater detectorEnvironmental sciencephotoacousticslcsh:PhysicsWater vaporFrontiers in Physics
researchProduct