Searched for: subject%3A%22Laser%255C+Diagnostics%22
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document
Mazza, F. (author)
The present dissertation covers the development of ultrabroadband femtosecond/picosecond coherent Raman spectroscopy (CRS) to measure temperature and species concentrations in gas-phase chemically reacting flows.<br/>Since its first demonstration in 1965, CRS has been vastly employed as a non-linear optical spectroscopic technique to quantify...
doctoral thesis 2023
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Thornquist, Ona (author)
With the onset of climate change it is crucial to eliminate emissions, particularly for aviation reliant on gas turbine combustion. Computational models aid combustor improvement, but experimental data needed for validation is difficult to obtain. Fortunately, laser diagnostics can now achieve non-intrusive, high-resolution combustion...
master thesis 2022
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Mazza, F. (author), Griffioen, N. (author), Castellanos, Leonardo (author), Klyukin, Dmitry (author), Bohlin, G.A. (author)
We present ultrabroadband two-beam femtosecond/picosecond coherent Raman spectroscopy on the ro-vibrational spectra of CO<sub>2</sub> and O<sub>2</sub>, applied for multispecies thermometry and relative concentration measurements in a standard laminar premixed hydrocarbon flame. The experimental system employs fs-laser-induced filamentation...
journal article 2022
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Vijayaraghavan, Anand (author)
Hybrid fs/ps coherent anti-Stokes Raman CARS is a powerful laser diagnostic technique for thermometry and concentration measurements in chemically-reacting flows. The use of SHBC to generate the ps probe pulse is simple, robust, and relatively efficient. However, the presence of spectral sidebands in this pulse determines an additional...
master thesis 2021
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Klyukin, Dmitry (author), Mazza, F. (author), Castellanos, Leonardo (author), Bohlin, G.A. (author)
Cascaded coherent anti-Stokes Raman scattering (CARS) signals can be efficiently generated from CARS signals when propagating collinearly with the pump/Stokes and probe beams. This effect can be seen as the CARS beam acting as the probe beam and being inelastically scattered a ‘second time’ from the Raman coherence induced along the focus of...
journal article 2021
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Huang, X. (author)
The technique called "flameless combustion", also denoted as "MILD" combustion, was developed to reduce the nitrogen oxides (NOx) emission in the combustion process. The term "flameless" refers to the low visibility of the flame. The technique is particularly of interest when hot exhaust gas is used to preheat inlet air to high temperature. The...
doctoral thesis 2018
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Bohlin, G.A. (author)
We develop simultaneous ultrafast CARS thermometry and species detection as a unique tool to investigate combustion modes with reduced emissions of NOx, particulates, CO and unburned hydrocarbons. Coherent anti-Stokes Raman spectroscopy (CARS) has been developed over the last 4 decades for various gas-phase-, plasma-, flame- and combustion...
abstract 2018
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Shah, Yash (author)
Laser diagnostic techniques such as Particle Image Velocimetry and Particle Tracking Velocimetry to measure the flow of a fluid around an object have been in prevalence for a few decades. Typically, the fluid, whose motion is of interest, is seeded with micron scale particles and illuminated with a laser. Due to scattering inefficiencies of...
master thesis 2017
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