Mid-infrared dual frequency comb spectroscopy for combustion analysis from 2.8 to 5 µm

Makowiecki, Amanda S.; Herman, Daniel I.; Hoghooghi, Nazanin; Strong, Elizabeth F.; Cole, Ryan K.; Ycas, Gabriel; Giorgetta, Fabrizio R.; Lapointe, Caelan; Glusman, Jeffrey F.; Daily, John W.; Hamlington, Peter E.; Newbury, Nathan R.; Coddington, Ian; Rieker, Gregory B.

doi:10.1016/j.proci.2020.06.195

Cited by 43 publications

(17 citation statements)

References 34 publications

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“…Future work will focus on extensions to include additional pyrolysate species, finite-rate chemistry, char oxidation, and smoldering combustion. With more pyrolysis and combustion relevant species, comparisons to the mid-infrared frequency comb measurements of Makowiecki et al (2020b) will be possible with the inclusion of the reduced biomass combustion model published by Glusman et al (2019). Moreover, coupling these computationally efficient simulations with parameter estimation methods such as approximate Bayesian computation (Christopher et al, 2018), could allow for automated estimation of simulation parameters (i.e., heat of reaction and Arrhenius reaction coefficients) as well as initial conditions (i.e., temperature and water mole fraction) and/or boundary conditions (i.e., unmeasured parameters during experimental procedure).…”

Section: Discussionmentioning

confidence: 99%

Validation of Computationally Efficient Simulations of Douglas Fir Pyrolysis and Combustion Using Time-Resolved Frequency Comb Laser Measurements

Glusman

Lapointe

Makowiecki

et al. 2022

Front. For. Glob. Change

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Computational simulations have the potential to provide low-cost, low-risk insights into wildland fire structure and dynamics. Simulation accuracy is limited, however, by the difficulty of modeling physical processes that span a wide range of spatial scales. These processes include heat transfer via radiation and turbulent advection, as well as both solid- and gas-phase chemistry. In the present study, we perform large eddy simulation (LES) with adaptive mesh refinement to model the multi-phase pyrolysis and combustion of dry Douglas fir, where temperature-based lookup tables corresponding to a multi-step pyrolysis mechanism are used to represent the composition of gas-phase pyrolysis products. Gas-phase and surface temperatures, mass loss, and water vapor mole fraction from the LES are shown to compare favorably with experimental measurements of a radiatively heated Douglas fir fuel sample undergoing pyrolysis and combustion beneath a cone calorimeter. Using frequency comb laser diagnostics, optical and infrared cameras, and a load cell, the experiments provide simultaneous in situ, time-resolved measurements of chemical composition, temperature, and mass loss. The present study thus combines cutting edge computational and experimental techniques with multi-step chemical pyrolysis modeling to provide a validated computational tool for the prediction of solid fuel pyrolysis and combustion relevant to wildland fires.

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Section: Discussionmentioning

confidence: 99%

Validation of Computationally Efficient Simulations of Douglas Fir Pyrolysis and Combustion Using Time-Resolved Frequency Comb Laser Measurements

Glusman

Lapointe

Makowiecki

et al. 2022

Front. For. Glob. Change

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“…The DCS can also be used for studying fast chemical reactions in the harsh conditions of combustion processes. For example, a fuel/tracer reaction in a continuously scavenged calibration flow cell at high temperature and pressure [75] and to study the dynamics of pyrolysis in combustion systems [76].…”

Section: Discussionmentioning

confidence: 99%

Broadband Time-Resolved Absorption and Dispersion Spectroscopy of Methane and Ethane in a Plasma Using a Mid-Infrared Dual-Comb Spectrometer

Abbas

Dijk

Jahromi

et al. 2020

Sensors

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Conventional mechanical Fourier Transform Spectrometers (FTS) can simultaneously measure absorption and dispersion spectra of gas-phase samples. However, they usually need very long measurement times to achieve time-resolved spectra with a good spectral and temporal resolution. Here, we present a mid-infrared dual-comb-based FTS in an asymmetric configuration, providing broadband absorption and dispersion spectra with a spectral resolution of 5 GHz (0.18 nm at a wavelength of 3333 nm), a temporal resolution of 20 μs, a total wavelength coverage over 300 cm−1 and a total measurement time of ~70 s. We used the dual-comb spectrometer to monitor the reaction dynamics of methane and ethane in an electrical plasma discharge. We observed ethane/methane formation as a recombination reaction of hydrocarbon radicals in the discharge in various static and dynamic conditions. The results demonstrate a new analytical approach for measuring fast molecular absorption and dispersion changes and monitoring the fast dynamics of chemical reactions over a broad wavelength range, which can be interesting for chemical kinetic research, particularly for the combustion and plasma analysis community.

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“…Coherent light sources in the MIR frequency range (3 µm to 25 µm) are critical for molecular spectroscopy as applied to fundamental materials science and chemistry [55,56], environmental monitoring [57,58], the determination of protein structure [59], combustion analysis [60,61] and medical diagnostics such as breath analysis [62]. With high peak power and a broad spectrum, the output pulse is suitable to produce MIR pulse through IP-DFG, which we explore with both OP-GaAs and CSP.…”

Section: Mir Generation and Characterizationmentioning

confidence: 99%

Single-cycle all-fiber frequency comb

Xing,

Lesko,

Umeki

et al. 2021

Preprint

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Single-cycle pulses with deterministic carrier-envelope phase enable the study and control of light-matter interactions at the sub-cycle timescale, as well as the efficient generation of low-noise multi-octave frequency combs. However, current single-cycle light sources are difficult to implement and operate, hindering their application and accessibility in a wider range of research. In this paper, we present a single-cycle 100 MHz frequency comb in a compact, turn-key, and reliable all-silica-fiber format. This is achieved by amplifying 2 µm seed pulses in heavily-doped Tm:fiber, followed by cascaded self-compression to yield 6.8 fs pulses with 215 kW peak power and 374 mW average power. The corresponding spectrum covers more than two octaves, from below 700 nm up to 3500 nm. Driven by this single-cycle pump, supercontinuum with 180 mW of integrated power and a smooth spectral amplitude between 2100 and 2700 nm is generated directly in silica fibers. To broaden applications,few-cycle pulses extending from 6 µm to beyond 22 µm with long-term stable carrier-envelope phase are created using intra-pulse difference frequency, and electro-optic sampling yields comb-tooth-resolved spectra. Our work demonstrates the first all-fiber configuration that generates single-cycle pulses, and provides a practical source to study nonlinear optics on the same timescale.

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Mid-infrared dual frequency comb spectroscopy for combustion analysis from 2.8 to 5 µm

Cited by 43 publications

References 34 publications

Validation of Computationally Efficient Simulations of Douglas Fir Pyrolysis and Combustion Using Time-Resolved Frequency Comb Laser Measurements

Validation of Computationally Efficient Simulations of Douglas Fir Pyrolysis and Combustion Using Time-Resolved Frequency Comb Laser Measurements

Broadband Time-Resolved Absorption and Dispersion Spectroscopy of Methane and Ethane in a Plasma Using a Mid-Infrared Dual-Comb Spectrometer

Single-cycle all-fiber frequency comb

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Mid-infrared dual frequency comb spectroscopy for combustion analysis from 2.8 to 5 µm

Cited by 43 publications

References 34 publications

Validation of Computationally Efficient Simulations of Douglas Fir Pyrolysis and Combustion Using Time-Resolved Frequency Comb Laser Measurements

Validation of Computationally Efficient Simulations of Douglas Fir Pyrolysis and Combustion Using Time-Resolved Frequency Comb Laser Measurements

Broadband Time-Resolved Absorption and Dispersion Spectroscopy of Methane and Ethane in a Plasma Using a Mid-Infrared Dual-Comb Spectrometer

Single-cycle all-fiber frequency comb

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Mid-infrared dual frequency comb spectroscopy for combustion analysis from 2.8 to 5 µm