R Mitchell Spearrin
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Explore the profile of R Mitchell Spearrin including associated specialties, affiliations and a list of published articles.
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Recent Articles
1.
Sanders I, Oberlander K, Spearrin R
Proc Combust Inst
. 2025 Mar;
40(1-4).
PMID: 40078173
A two-dimensional solid-fuel combustion experiment for fire-resistant polymers under forced convective cross-flow was developed to assess burn characteristics and toxicant formation using advanced laser absorption diagnostics that enable in situ...
2.
Xu H, Abuseada M, Ju Y, Spearrin R, Fisher T
Energy Fuels
. 2024 Sep;
38(18):18087-18089.
PMID: 39324100
Methane pyrolysis is known to produce hydrogen and solid carbon in a variety of thermal processes. However, the generated carbon product typically belongs to a low-value amorphous type. Here, we...
3.
Wei C, Spearrin R
Opt Lett
. 2023 Dec;
49(1):141-144.
PMID: 38134172
A four-dimensional (4D) mid-infrared laser absorption imaging technique has been developed and demonstrated for quantitative, time-resolved, volumetric measurements of temperature and species concentration in dynamic combustion flows. This technique employs...
4.
Minesi N, Nair A, Richmond M, Kuenning N, Jelloian C, Spearrin R
Appl Opt
. 2023 Feb;
62(3):782-791.
PMID: 36821284
A multi-MHz laser absorption sensor at 777.2 nm (12,863 ) is developed for simultaneous sensing of (1) ( ) number density, (2) electron number density, and (3) translational temperature at...
5.
Jelloian C, Minesi N, Spearrin R
Appl Phys B
. 2022 Nov;
128(12):216.
PMID: 36407910
A high-speed laser absorption technique is employed to resolve spectral transitions of CO in the mid-infrared at MHz rates to infer non-equilibrium populations/temperatures of translation, rotation and vibration in shock-heated...
6.
Wei C, Schwarm K, Pineda D, Spearrin R
Opt Express
. 2021 Jul;
29(14):22553-22566.
PMID: 34266015
A deep learning method for laser absorption tomography was developed to effectively integrate physical priors related to flow-field thermochemistry and transport. Mid-fidelity reacting flow simulations were coupled with a forward...
7.
Wei C, Schwarm K, Pineda D, Spearrin R
Opt Lett
. 2020 Apr;
45(8):2447-2450.
PMID: 32287255
Mid-infrared laser absorption imaging of methane in flames is performed with a learning-based approach to the limited view-angle inversion problem. A deep neural network is trained with superimposed Gaussian field...
8.
Pineda D, Urban J, Spearrin R
Appl Opt
. 2020 Apr;
59(7):2141-2148.
PMID: 32225740
A mid-infrared absorption spectroscopy technique has been developed to quantitatively and spatially resolve gas temperature and molecular abundance of $ ^1{{\rm H}^{35}}{\rm Cl} $HCl in the high-temperature pyrolysis and oxidation...
9.
Schwarm K, Wei C, Pineda D, Spearrin R
Appl Opt
. 2019 Sep;
58(21):5656-5662.
PMID: 31503867
In this work, laser absorption imaging is expanded in temporal resolution capability to kilohertz measurement rates by coupling sparsely sampled wavelength scanning and digital image postprocessing for diffraction correction. The...
10.
Tancin R, Spearrin R, Goldenstein C
Opt Express
. 2019 Jun;
27(10):14184-14198.
PMID: 31163871
This manuscript presents the design and initial application of a mid-infrared laser-absorption-imaging (LAI) technique for two-dimensional (2D) measurements and tomographic reconstruction of gas temperature and CO in laminar flames. In...