Mid-infrared laser absorption tomography for quantitative 2D thermochemistry measurements in premixed jet flames

Wei, Chuliang; Pineda, Daniel I.; Paxton, Laurel; Egolfopoulos, Fokion N.; Spearrin, R. Mitchell

doi:10.1007/s00340-018-6984-z

Cited by 58 publications

(15 citation statements)

References 31 publications

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“…Soot volume fraction can be inferred from Eq. 7: 8and 9, which are related to laser wavelength λ [21]:…”

Section: Multi-parameter Measurement Methodologymentioning

confidence: 99%

“…Other non-intrusive techniques such as coherent anti-Stokes Raman scattering (CARS) can also be used to measure the temperature distributions in the flame. But these optical systems require complicated optics and expensive laser sources to realize high spatial and temporal resolution measurements, which are sometimes challenging to meet [17]- [21]. Given the limitation of TDLAS by its path-integrated nature, it is suitable for homogeneous reaction systems.…”

Section: Introductionmentioning

confidence: 99%

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Multiparameter Measurement in Ethylene Diffusion Flame Based on Time-Division Multiplexed Tunable Diode Laser Absorption Spectroscopy

et al. 2019

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An optical method for measuring soot volume fraction, flame temperature, and concentration of combustion products in a diffusion flame based on time-division multiplexed tunable diode laser absorption spectroscopy technique is presented in this article. By moving the slot burner with an electric platform, two-dimensional profile of soot volume fraction, flame temperature, and gas concentrations along the flame sheet with 1-mm spatial resolution were obtained simultaneously. The flame temperature and soot volume fraction were simultaneously on-line monitored using one distributed feedback diode laser with a center wavelength at 1397.83 nm. Tunable diode laser absorption spectroscopy based temperature measurements in the flame were carried out by two-line thermometry of H 2 O and compared with the thermocouple technique. The attenuation of tunable diode laser intensity caused by soot extinction and gas absorption after transmitting through the diffusion flame was detected. And the soot volume fraction was determined quantitatively with laser extinction based on Rayleigh limit assumption. Two tunable distributed feedback diode lasers with center wavelength at 2001.6 and 2302 nm were used to determine the CO 2 concentration and CO concentration, respectively. The experimental results of soot volume fraction, flame temperature, and the mole fraction of combustion products by varying concentrations of CO 2 added in the diffusion flame were analyzed.

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“…Soot volume fraction can be inferred from Eq. 7: 8and 9, which are related to laser wavelength λ [21]:…”

Section: Multi-parameter Measurement Methodologymentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Multiparameter Measurement in Ethylene Diffusion Flame Based on Time-Division Multiplexed Tunable Diode Laser Absorption Spectroscopy

et al. 2019

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“…Since its first applications in measuring laminar flames, LAS has been widely used in lab‐scale as well as in practical combustion and propulsion systems 18 . By a combination of multiline profile‐fitting strategy or temperature‐binning strategy or the tomographic reconstruction method, LAS can resolve the nonuniform distribution of thermochemical parameters along the line‐of‐sight (LOS), 19–22 providing spatially resolved imaging of the target combustion field 23–28 . Considering its widespread and successful applications in both steady laminar flames 23–27 and unsteady turbulent flames, 28,29 LAS is believed to be suitable for quantifying the thermochemical structure in gas‐fired cooker flame.…”

Section: Introductionmentioning

confidence: 99%

Mid‐infrared multiline absorption tomography for in situ analysis of thermochemical structure in natural gas‐fired cooker flame

Sheng

Han

et al. 2022

Micro & Optical Tech Letters

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A mid-infrared laser absorption tomography technique was developed to quantify the nonuniform thermochemical structures of flames stabilized on a natural gas-fired cooker. Multispectral absorption spectroscopy coupled with Tikhonov-regularized three-point Abel inversion was used to resolve the spatially resolved temperature and species concentration. A tunable interband cascade laser (ICL) near 4.2 μm was used to access multiple CO 2 absorption lines in the fundamental vibration band. Multiline Voigt fitting strategy was used to improve the fitting of the overlap absorption features. Comprehensive measurements at a different height above the cooker were performed and assembled to display the contour of temperature and CO 2 concentrations, resolving the nonuniform thermochemical structure of the high-temperature combustion field. The measurement uncertainty analysis for temperature and CO 2 concentration was also discussed. The current technique is demonstrated to be capable of quantitatively distinguishing flame conditions under different fuel supply modes.

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“…Other lasers are also available in the MIR; for example, using DFB and interband cascade (IC) lasers (not operated simultaneously), Wei et al [ 18 ] were able to measure temperature, CO concentration (via two CO transitions at 2008.53 and 2006.78 cm −1 , respectively), and CO 2 concentration (via probing a CO 2 transition at 2384.19 cm −1 ) in an atmospheric-pressure pilot-stabilized C 2 H 4 /air jet flame. Profiles of these scalars were obtained by translating the sender/receiver units as a whole—and thus the analysis beam—horizontally and vertically through the fixed burner flame.…”

Section: Introductionmentioning

confidence: 99%

A Compact Fiber-Coupled NIR/MIR Laser Absorption Instrument for the Simultaneous Measurement of Gas-Phase Temperature and CO, CO2, and H2O Concentration

Shi

Endres

Jeffries

et al. 2022

Sensors

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A fiber-coupled, compact, remotely operated laser absorption instrument is developed for CO, CO2, and H2O measurements in reactive flows at the elevated temperatures and pressures expected in gas turbine combustor test rigs with target pressures from 1–25 bar and temperatures of up to 2000 K. The optical engineering for solutions of the significant challenges from the ambient acoustic noise (~120 dB) and ambient test rig temperatures (60 °C) are discussed in detail. The sensor delivers wavelength-multiplexed light in a single optical fiber from a set of solid-state lasers ranging from diodes in the near-infrared (~1300 nm) to quantum cascade lasers in the mid-infrared (~4900 nm). Wavelength-multiplexing systems using a single optical fiber have not previously spanned such a wide range of laser wavelengths. Gas temperature is inferred from the ratio of two water vapor transitions. Here, the design of the sensor, the optical engineering required for simultaneous fiber delivery of a wide range of laser wavelengths on a single optical line-of-sight, the engineering required for sensor survival in the harsh ambient environment, and laboratory testing of sensor performance in the exhaust gas of a flat flame burner are presented.

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Mid-infrared laser absorption tomography for quantitative 2D thermochemistry measurements in premixed jet flames

Cited by 58 publications

References 31 publications

Multiparameter Measurement in Ethylene Diffusion Flame Based on Time-Division Multiplexed Tunable Diode Laser Absorption Spectroscopy

Multiparameter Measurement in Ethylene Diffusion Flame Based on Time-Division Multiplexed Tunable Diode Laser Absorption Spectroscopy

Mid‐infrared multiline absorption tomography for in situ analysis of thermochemical structure in natural gas‐fired cooker flame

A Compact Fiber-Coupled NIR/MIR Laser Absorption Instrument for the Simultaneous Measurement of Gas-Phase Temperature and CO, CO2, and H2O Concentration

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