Temperature and bath gas composition dependence of effective fluorescence lifetimes of toluene excited at 266 nm

Faust, S.; Dreier, Thomas; Schulz, Christof

doi:10.1016/j.chemphys.2011.03.013

Cited by 30 publications

(10 citation statements)

References 33 publications

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“…Since the absorption wavelengths of toluene are within the low UV spectrum, excitation can be achieved by means of high-power lasers such as krypton fluoride (KrF) lasers at 248 mm, quadrupled (fourth harmonic) neodymium-doped yttrium aluminium garnet (Nd:YAG) lasers at 266 nm, as well as tunable lasers. Following laser excitation, the fluorescence lifetimes of toluene are generally below about 50 ns for pure nitrogen at ambient conditions and decrease with temperature and oxygen concentration, exhibiting lifetimes shorter than 1 ns in pure air at ambient pressure and temperature (Faust et al 2011). …”

Section: Toluene Plifmentioning

confidence: 98%

Toluene-based planar laser-induced fluorescence imaging of temperature in hypersonic flows

et al. 2015

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Section: Toluene Plifmentioning

confidence: 98%

Toluene-based planar laser-induced fluorescence imaging of temperature in hypersonic flows

et al. 2015

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“…[48][49][50] Being able to determine lifetimes as short as nanoseconds will require shorter laser-pulse durations and hence picosecond lasers are used in such measurements. With picosecond laser pulses, fluorescence-lifetime data can be acquired in two dimensions using either intensified chargecoupled device (CCD) cameras or streak cameras.…”

Section: Laser-induced Fluorescencementioning

confidence: 99%

Advanced Laser-Based Techniques for Gas-Phase Diagnostics in Combustion and Aerospace Engineering

Ehn

Zhu

et al. 2017

Appl Spectrosc

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Gaining information of species, temperature, and velocity distributions in turbulent combustion and high-speed reactive flows is challenging, particularly for conducting measurements without influencing the experimental object itself. The use of optical and spectroscopic techniques, and in particular laser-based diagnostics, has shown outstanding abilities for performing non-intrusive in situ diagnostics. The development of instrumentation, such as robust lasers with high pulse energy, ultra-short pulse duration, and high repetition rate along with digitized cameras exhibiting high sensitivity, large dynamic range, and frame rates on the order of MHz, has opened up for temporally and spatially resolved volumetric measurements of extreme dynamics and complexities. The aim of this article is to present selected important laser-based techniques for gas-phase diagnostics focusing on their applications in combustion and aerospace engineering. Applicable laser-based techniques for investigations of turbulent flows and combustion such as planar laser-induced fluorescence, Raman and Rayleigh scattering, coherent anti-Stokes Raman scattering, laser-induced grating scattering, particle image velocimetry, laser Doppler anemometry, and tomographic imaging are reviewed and described with some background physics. In addition, demands on instrumentation are further discussed to give insight in the possibilities that are offered by laser flow diagnostics.

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“…Once these dependencies are known [3][4][5], measurements of τ eff can be used to determine a specific quantity of interest, assuming the other variables can be controlled or calculated.…”

mentioning

confidence: 99%

“…For the present application toluene was chosen as a tracer since the dependence of relative fluorescence quantum yield, and hence effective fluorescence lifetime, on temperature and oxygen partial pressure are well known [8,9] and captured by a simple phenomenological model [5,8]. In particular, in pure nitrogen, where quenching by molecular oxygen is absent, the temperature dependence of τ can be described by a monoexponential decay [5]:…”

mentioning

confidence: 99%

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In-cylinder temperature measurements via time-correlated single-photon counting of toluene laser-induced fluorescence through a fiber-based sensor

et al. 2012

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In a near-production internal combustion engine, the effective fluorescence lifetime of toluene was determined by time-correlated single-photon counting with a minimally invasive fiber-optic spark-plug sensor. The lifetime measurement provided continuous crank-angle-resolved measurements of gas temperature. Proof-of-concept experiments in a motored four-cylinder spark-ignition engine were evaluated with a time resolution of 500 μs, yielding temperature precision of 25 K (standard deviation) at top-dead center. In these experiments, 10% toluene was added to the nonfluorescent base fuel iso-octane. Fluorescence lifetimes were related to temperature via calibration measurements in a high temperature pressure vessel, with the data fitted to a functional dependence derived from a previously published phenomenological model.

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Temperature and bath gas composition dependence of effective fluorescence lifetimes of toluene excited at 266 nm

Cited by 30 publications

References 33 publications

Toluene-based planar laser-induced fluorescence imaging of temperature in hypersonic flows

Toluene-based planar laser-induced fluorescence imaging of temperature in hypersonic flows

Advanced Laser-Based Techniques for Gas-Phase Diagnostics in Combustion and Aerospace Engineering

In-cylinder temperature measurements via time-correlated single-photon counting of toluene laser-induced fluorescence through a fiber-based sensor

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