tunable laser diode absorption spectroscopy
Rocket Motor Diagnostics using Tunable Diode Laser Spectroscopy for Chemically Non-Reacting Air/Water Vapor Mixture in Internal Flow
... When measuring small differences in intensity across combustion particles certain techniques have to be utilized in order to limit interference from beam steering and scattering due to refraction, combustion ...
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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
... DFB laser source was replaced by a VCSEL rather than a SC laser source in order to make the whole system portable, the applicable scanning range from ...the laser diode controller so that the ...
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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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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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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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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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Experimental Study of Broadening Coefficients for the v3 Band of CO by Tunable Diode Laser Spectroscopy
... In this paper, the high resolution spectra of CO at temperatures ranging from 323K to 873K are recorded by using a distributed feed-back (DFB) diode laser based spectrometer combined with high temperature ...
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Recovery of absolute absorption line shapes in tunable diode laser spectroscopy using external amplitude modulation with balanced detection
... 1 open) whilst the red signal is the output with the switch, S1, closed allowing the background signals to be nulled. In this example the lock-in gain could be increased (sensitivity setting changed from 50 mV to 20 mV) ...
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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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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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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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Wavelength calibration of Brewer spectrophotometer using a tunable pulsed laser and implications to the Brewer ozone retrieval
... a tunable pulsed laser system based on an optical parametric oscillator (OPO) was used at Physikalisch-Technische Bundesanstalt (PTB) in Braun- schweig ...The laser beam was guided into the direct ...
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Tunable diode laser measurements of hydrothermal/volcanic CO 2 and implications for the global CO 2budget
... Acknowledgements. The research leading to these results has received funding from the European Research Council un- der the European Union’s Seventh Framework Programme (FP7/2007/2013)/ERC grant agreement no. 1305377, ...
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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
... 300 µ m diameter, we measured the absorption spectra with spatial resolution of 30 µ m using a vertical-cavity surface-emitting laser diode. The spectra observed near the electrode at 10 kPa gas ...
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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
... airborne tunable diode laser spectrometer during the MUlti-platform remote Sensing of Isotopologues for investigating the Cycle of Atmospheric water (MUSICA) remote sensing validation ...
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OH detection by absorption of frequency doubled diode laser radiation at 308nm
... of diode lasers near 400 nm 19 , genera- tion of 308 nm radiation by mixing the outputs of two diode lasers in a non-linear crystal becomes a ...the diode laser fundamental output can be ...
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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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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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Field-deployable diode-laser-based differential absorption lidar (DIAL) for profiling water vapor
... the laser transmitter beam matches the f number of the telescope to maximize efficiency of the lens, to avoid vignetting, and to collimate the outgoing laser beam as it exits the ...the laser ...
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