Tunable diode laser absorption spectroscopy
Tunable diode laser absorption spectroscopy based detection of propane for explosion early warning by using a vertical cavity surface enhanced laser source and principle component analysis approach
... transportation. Tunable diode laser absorption spec- troscopy (TDLAS) technology has the potential to provide an excellent basis both for early warning of explosion hazards and additionally to ...
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TDLAS Detection of propane and butane gas over the near-infrared wavelength range from 1678nm to 1686nm
... Abstract. It is important in the petrochemical industry that there are high sensitivity, high accuracy, low-power consumption and intrinsically safe methods for the detection of propane, butane and their gas mixtures, to ...
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Application of continuous-wave cavity ring-down spectroscopy to laminar flames
... as tunable diode laser absorption spectroscopy, produce little to no perturbation in the combustion process as it is non-intrusive and measurements can be made ...single-pass ...
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Experimental Study of Broadening Coefficients for the v3 Band of CO by Tunable Diode Laser Spectroscopy
... A diode laser sensor based on absorption spectroscopy is developed for measurement of self-broadening coefficients for the three lines of v3 band of CO at high ...
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Recovery of absolute absorption line shapes in tunable diode laser spectroscopy using external amplitude modulation with balanced detection
... the absorption- dependent AM signal from the linear output with the background AM ...AM absorption signal scales exactly with the DC absorption signal and the autobalance operation of the circuit ...
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Rocket Motor Diagnostics using Tunable Diode Laser Spectroscopy for Chemically Non-Reacting Air/Water Vapor Mixture in Internal Flow
... Finally absorption spectroscopy became of interest due to its versatility and advantages in a range of ...powered, tunable lasers could measure concentration of species, velocity, and temperature in ...
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A new RAM normalized 1f-WMS technique for the measurement of gas parameters in harsh environments and a comparison with 2f/1f
... gas absorption line-shape, allowing the recovery of gas parameters in the same manner as using direct tunable diode laser ...the laser, which still requires ...
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Tunable diode laser in-situ CH4 measurements aboard the CARIBIC passenger aircraft: instrument performance assessment
... kilometre. Diode-laser absorption spectroscopy offers the capability for precise and accurate measurements at small instrument size, and several research instruments have been developed in the ...
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Fast Laser Spectroscopy: Dynamical Absorption Line
... small laser beam cross-section, and short laser beam paths, the absorption line achieved with tunable diode laser is non-repeatable and chaotically modulated in principle, even ...
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Sampled grating DBR laser as a spectroscopic source in multigas detection at 1 52 1 57um
... Multigas detection has been achieved using a widely tunable SG-DBR laser diode as a light source using absorption spectroscopy.. The characteristics power, SMSR and wavelength tuning of [r] ...
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Portable Laser Photoacoustic Methane Sensor Based on FPGA
... infrared absorption spectroscopy ...technique. Tunable near-infrared diode lasers and tunable mid-infrared quantum cascade lasers (QCLs) are generally employed as excitation light ...
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Tunable diode laser measurements of hydrothermal/volcanic CO 2 and implications for the global CO 2budget
... from the fumaroles of the Campi Flegrei (the Phlegraean Fields, southern Italy), by using a portable tunable diode laser (TDL) system. Here we extend this previous work, discussing the results of TDL ...
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Wavelength calibration of Brewer spectrophotometer using a tunable pulsed laser and implications to the Brewer ozone retrieval
... ozone absorption coefficients used by the Brewer ozone ...a tunable laser source at PTB in the framework of the EMRP project ENV59 ATMOZ “Traceability for the total column ...ozone absorption ...
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Time resolved infrared imaging and spectroscopy for engine diagnostics
... Not all IR bands are equally useful. The near infrared band (NIR, 0.7-1.4 µm) offers a performance/price ratio only slight- ly worse than the visible band but only offers access to emis- sion lines of water. The ...
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Spatially Resolved Absorption Spectroscopy on a Microhollow Cathode Helium Plasma Using a Vertical-Cavity Surface-Emitting Laser
... the laser light in front of the discharge ...the laser light intensity without the absorption I 0 by ...helium absorption was ...the absorption spectra using the following ...
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Nonresonant self-injection seeding of a gain-switched diode laser
... The simple estimates (2)–(4) are only valid, first, for very small and, second, in the absence of modulation. Experi- mentally, spectrum narrowing and mode hopping due to external cavity adjustments are indeed observed ...
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OH detection by absorption of frequency doubled diode laser radiation at 308nm
... nm, a conversion efficiency about an order of magni- tude lower than that calculated for an optimally focused Gaussian beam in the crystal. Our UV re- flection loss at the crystal output face was estimated to be 30%, and ...
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Airborne in situ vertical profiling of HDO / H 16 2 O in the subtropical troposphere during the MUSICA remote sensing validation campaign
... Seven research flights were conducted from Las Palmas Airport (LPA), Canary Islands, Spain. The Canary Islands are located in the subtropical North Atlantic, approximately 200 km west off the coast of Morocco at 28 ◦ N ...
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Improved Optical Probe for Measuring Phytoplankton Suspension Concentrations Based on Optical Fluoresensce and Absorption
... of absorption by using a single light source, laser diode 690 nm has been ...on absorption characteristic of phytoplankton intensity ...
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