Mid-infrared laser polarization spectroscopy for quantitative measurement of species and temperature: a review

Zhao, Wanxia; Alwahabi, Zeyad T.; Dally, Bassam B.

doi:10.1007/s00340-022-07884-x

Cited by 3 publications

(4 citation statements)

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“…The background in uence can be reduced by a high-quality pair of crossed polarizers so that the signal from the target species can be discriminated from the surrounding environment. 3 PS has been applied in the UV/visible range based on electronic transitions of OH, C 2 , NH, [4][5][6] and twophoton electronic transitions of NH 3 and CO. 7 However, only limited species can be measured in this χ max C 2 H 2 spectral range. Many important species, such as CO 2 , C 2 H 2 , and CH 4 , cannot be probed by UV/visible PS as they do not possess accessible transitions.…”

Section: Introductionmentioning

confidence: 99%

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Quantifying Acetylene Mole Fraction in Rich Flat Laminar Premixed C2H4/Air Flames

Zhao

Alwahabi

Dally

2023

Preprint

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Mid-infrared laser polarization spectroscopy (IRPS) has been applied to measure the mole fraction of acetylene in rich premixed laminar C2H4/Air flat flames at equivalence ratios (Φ) of 1.7, 2.1, and 2.3, and under atmospheric pressure. The detection was conducted by probing the ro-vibrational P(19) transition at ~ 3.1 µm. The total collisional broadening coefficient of C2H2 was approximately 0.074 cm− 1atm− 1 and varied within a range of 0.5% under different flame conditions, which made the effect of linewidth not obvious in the CH4/air flame. The calculated mole fraction of C2H2, using the Chemkin model, at Φ = 1.3 and 1.5 was used to calibrate the recorded IRPS signal intensities at different Height Above Burner (HAB). A single scaling factor was then used to quantify the measured C2H2 at highly sooting conditions, Φ = 1.7, 2.1, and 2.3, with a Limit of Detection (LoD) of 35 ± 5 ppm. The first observed C2H2 mole fraction appeared at HAB of 3 mm and measured as 2003 ppm, 2217 ppm, and 2495 ppm, for Φ = 1.7, 2.1, and 2.3, respectively. The mole fraction increased as the HAB increased to reach the maximum value of 2296 ppm, 2807 ppm, and 3478 ppm, for Φ = 1.7, 2.1, and 2.3, respectively, up to HAB of 5 mm. It was observed that the C2H2 mole fraction reaches a plateau region at HAB of ~ 8 mm. The production of C2H2 has been observed to be subject to a critical gas temperature of 1400 ± 30 K. The critical soot inception temperature, where the first incepted soot particles are observed, is the same as the gas temperature where ${\chi }_{{{C}_{2}H}_{2}}^{max}$ was detected, namely at 1500 ± 30 K. These measurements and calibration procedure demonstrate a plausible technique to probe other flames and to better understand soot inception and its correlation with C2H2.

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Section: Introductionmentioning

confidence: 99%

“…Mid-infrared laser polarization spectroscopy (IRPS) has been introduced as a tool to detect molecules in the mid-IR (2-5 um) via ro-vibrational transitions. 3 By probing molecular vibrational transitions, it is expected that the in uence of molecular collisions on the signal will be reduced.…”

Section: Introductionmentioning

confidence: 99%

Quantifying Acetylene Mole Fraction in Rich Flat Laminar Premixed C2H4/Air Flames

Zhao

Alwahabi

Dally

2023

Preprint

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“…Compared with other nonlinear laser techniques, PS has the advantage of high intensity, and its experimental setups are relatively simple. The background influence can be reduced by a high-quality pair of crossed polarizers so that the signal from the target species can be discriminated from the surrounding environment [3].…”

Section: Introductionmentioning

confidence: 99%

“…Many important species, such as CO 2 , C 2 H 2 , and CH 4 , cannot be probed by UV/visible PS as they do not possess accessible transitions. Mid-infrared laser polarization spectroscopy (IRPS) has been introduced as a tool to detect molecules in the mid-IR (2-5 um) via ro-vibrational transitions [3]. By probing molecular vibrational transitions, it is expected that the influence of molecular collisions on the signal will be reduced.…”

Section: Introductionmentioning

confidence: 99%

Quantifying acetylene mole fraction in rich flat laminar premixed C2H4/air flames using mid-infrared polarization spectroscopy

2023

Self Cite

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Mid-infrared laser polarization spectroscopy (IRPS) has been applied to measure the mole fraction of acetylene in rich premixed laminar C2H4/Air flat flames at equivalence ratios (Φ) of 1.7, 2.1, and 2.3, and under atmospheric pressure. The detection was conducted by probing the ro-vibrational P(19) transition at ~ 3.1 μm. The total collisional broadening coefficient of C2H2 was approximately 0.074 cm−1 atm−1 and varied within a range of 0.5% under different flame conditions, which made the effect of linewidth not obvious in the CH4/air flame. The calculated mole fraction of C2H2, using the Chemkin model, at Φ = 1.3 and 1.5 was used to calibrate the recorded IRPS signal intensities at different Height Above Burner (HAB). A single scaling factor was then used to quantify the measured C2H2 at highly sooting conditions, Φ = 1.7, 2.1, and 2.3, with a Limit of Detection (LoD) of 35 ± 5 ppm. The first observed C2H2 mole fraction appeared at HAB of 3 mm and measured as 2003 ppm, 2217 ppm, and 2495 ppm, for Φ = 1.7, 2.1, and 2.3, respectively. The mole fraction increased as the HAB increased to reach the maximum value of 2296 ppm, 2807 ppm, and 3478 ppm, for Φ = 1.7, 2.1, and 2.3, respectively, up to HAB of 5 mm. It was observed that the C2H2 mole fraction reaches a plateau region at HAB of ~ 8 mm. The production of C2H2 has been observed to be subject to a critical gas temperature of 1400 ± 30 K. The critical soot inception temperature, where the first incepted soot particles are observed, is the same as the gas temperature where $${\chi }_{{{\mathrm{C}}_{2}\mathrm{H}}_{2}}^{\mathrm{max}}$$ χ C 2 H 2 max was detected, namely at 1500 ± 30 K. These measurements and calibration procedure demonstrate a plausible technique to probe other flames and to better understand soot inception and its correlation with C2H2.

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Megahertz detection of spectroscopic polarization by a time-encoded supercontinuum vector beam

Inoue,

Ogawa,

Morita

et al. 2024

Appl. Opt.

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We demonstrated a 40-MHz detection of spectroscopic polarization by a supercontinuum vector beam with a wavelength-dependent polarization state. To achieve the high-repetition-rate measurement, we detected the rotation angle of polarization and the spectrum by measuring the temporal waveform using a photodetector after expanding the pulse duration of the supercontinuum vector beam. The spectrum of the supercontinuum vector beam was measured using a spectrometer. We compared it with the temporal waveforms, confirming a good agreement of spectra between the conventional spectrometer and the temporal waveforms. The detection method is useful for many applications requiring high-repetition-rate spectroscopic-polarization measurements, such as the defect inspection of thin optical materials.

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Mid-infrared laser polarization spectroscopy for quantitative measurement of species and temperature: a review

Cited by 3 publications

References 46 publications

Quantifying Acetylene Mole Fraction in Rich Flat Laminar Premixed C2H4/Air Flames

Quantifying Acetylene Mole Fraction in Rich Flat Laminar Premixed C2H4/Air Flames

Quantifying acetylene mole fraction in rich flat laminar premixed C2H4/air flames using mid-infrared polarization spectroscopy

Megahertz detection of spectroscopic polarization by a time-encoded supercontinuum vector beam

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