Quantitative Planar Laser-Induced Fluorescence Technology

Yang, Zhen; Yu, Xin; Peng, Jiangbo; Zhang, Jianlong

doi:10.5772/intechopen.79702

Cited by 4 publications

(3 citation statements)

References 22 publications

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“…(3) Equation ( 3) derives that the OH concentration at any position 𝑥 can be determined using only two experimental parameters, 𝜎 0 and the gradient of the natural logarithm of the fluorescence ratio. Precise details of bi-directional LIF can be found in previous studies (Versluis et al, 1997;Yang et al, 2009). Elimination of the quenching effect in the Stern-Volmer factor is advantageous under high pressures.…”

Section: Oh(20) Band Bi-directional Lif Methodsmentioning

confidence: 97%

Quantitative OH concentration measurement using OH(2,0) band bi-directional LIF method for high-pressure and high-temperature symmetrical flames

Higuchi

Nunome

Takada

et al. 2022

JTST

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Combustion measurements using laser diagnostics are vital for experimentally revealing both qualitative and quantitative flame characteristics. This paper focuses on the application of the quantitative OH laser-induced fluorescence (OH-LIF) method for high-pressure and high-temperature flames. Under high-pressure conditions, the intense OH chemiluminescence drastically decreases the signal to noise ratio (S/N). However, OH(2,0) band excitation is an alternative method to the typical OH(0,0) or OH(1,0) band excitation LIF under high-pressures. OH(2,0) band LIF sufficiently maintains the S/N under high-pressure because the OH fluorescence can be detected away from the peak OH chemiluminescence wavelength. In addition, the bi-directional LIF method is known as a quantitative OH concentration measurement that can ignore the quenching factor. Therefore, this study proposed a quantitative OH concentration measurement by combining the OH(2,0) band LIF and bidirectional LIF methods for high-pressure and high-temperature flames. First, an H2/air premixed flame created by a McKenna burner under atmospheric pressure was used to validate the quantitative OH(2,0) band bidirectional LIF method. Furthermore, a CH4/O2/N2 oxygen-enriched premixed flame created by a multi-hole calibration burner was used to verify the method under high-pressure (~0.5 MPa) and high temperature (~2900 K) conditions. A comparison of the experimental and numerical results revealed that the calculated OH concentrations were within the experimental uncertainty for the McKenna burner configuration. The experimental OH concentration results under high-pressure conditions deviated approximately 10%-20%, but they were also in good correlation with the calculation. In addition, the qualitative correlations with equivalence ratio and pressure variation were also acceptable. Although further consideration of the method is desirable for high-pressure turbulent flames, the results in this study showed that the OH(2,0) band bi-directional LIF method is feasible for measuring OH concentration in high-pressure and high-temperature flames.

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Section: Oh(20) Band Bi-directional Lif Methodsmentioning

confidence: 97%

Quantitative OH concentration measurement using OH(2,0) band bi-directional LIF method for high-pressure and high-temperature symmetrical flames

Higuchi

Nunome

Takada

et al. 2022

JTST

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“…These techniques in principle probe the ground state of the target species and provide maps of ground state concentrations. However, such measurements, especially with respect to plume laser induced fluorescence are difficult to quantify due to variations in quenching rate, laser line/spectral line overlap, self-absorption, saturation, and other effects [27].…”

Section: Introductionmentioning

confidence: 99%

Quantitative absorption spectroscopy of laser-produced plasmas

Weerakkody¹,

Glumac²

2021

J. Phys. D: Appl. Phys.

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Absorption spectroscopy with a xenon flash lamp source has been used to probe laser-produced plasmas. Signatures from atomic, ionic, monoxide, monohydride, and mononitride species are demonstrated. The strong uranium monoxide band at 593.55 nm is shown in absorption and emission at high resolution. U I, U II, BeH, ZrN, and SiO absorption spectra are also reported. Challenges and critical issues with using broadband absorption in laser plasmas to determine ground state path-averaged number densities and temperatures are discussed.

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“…Laser Induced Fluorescence (LIF) is a classical spectroscopic method utilized to observe specific species concentration in flow [1][2][3]. LIF operates by measuring the fluorescence of a passive flow tracer and relating that fluorescent signal to the concentration of the tracer.…”

Section: Introductionmentioning

confidence: 99%

Confounding effects of temperature in laser-induced fluorescence concentration measurements with iodine vapor

Karthick¹,

Cukurel²,

Jacobi³

2020

Meas. Sci. Technol.

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Laser Induced Fluorescence (LIF) provides a non-invasive, quantitative measurement of fluorescent tracers in complex mixing flows. The common availability of broad linewidth lasers and their use with iodine vapor tracers raises a significant concern about confounded tracer concentration measurements, due to the strong dependence of iodine fluorescence on both tracer concentration and flow temperature. We model the sensitivity of iodine fluorescent response to temperature fluctuations, especially for flows with significant temperature contrasts to ambient conditions, and establish a temperature uniformity requirement that bounds the relative error in tracer concentration measurements. We show that in a conventional laboratory setup, in order to bound the measured concentration error to about 5%, the relative temperature fluctuations in iodine LIF must be approximately an order of magnitude smaller than the desired measurement resolution of relative concentration fluctuations. Iodine LIF should thus be employed with great caution.

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Quantitative Planar Laser-Induced Fluorescence Technology

Cited by 4 publications

References 22 publications

Quantitative OH concentration measurement using OH(2,0) band bi-directional LIF method for high-pressure and high-temperature symmetrical flames

Quantitative OH concentration measurement using OH(2,0) band bi-directional LIF method for high-pressure and high-temperature symmetrical flames

Quantitative absorption spectroscopy of laser-produced plasmas

Confounding effects of temperature in laser-induced fluorescence concentration measurements with iodine vapor

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