Christopher Strand

All Publications

• Experimental Measurement of the Rate Coefficient for OCS + M, with M = Ar, He, N2, CO2 in a Shock Tube Using Laser Absorption Spectroscopy. The journal of physical chemistry. A Panda, A., Biswas, P. A., Simitz, L. V., Streicher, J. W., Strand, C. L., Hanson, R. K. 2026

  Abstract

  A comprehensive understanding of sulfur chemistry is crucial for the characterization and modeling of planetary atmospheres. The unimolecular decomposition of carbonyl sulfide (OCS + M = CO + S + M) is a critical reaction for the development of accurate photochemical models. In this study, we employ laser absorption spectroscopy (LAS)-based diagnostics in a shock tube to investigate the rate coefficient of OCS decomposition. Sensitive and interference-free diagnostics were developed to monitor OCS depletion at 2070.858 cm-1 and CO formation at 2115.628 cm-1. The reaction rate coefficient of OCS decomposition was measured over a temperature range of 1800-2500 K. This work represents the first experimental determination of OCS decomposition rates in bath gases pertinent to several planetary environments (i.e., He, N2, and CO2). Additionally, we characterize the pressure dependence of the reaction rate through measurements at 1, 2, and 8 atm. The rate constant measured at 2 atm for argon, k1,Ar, aligns with previous studies and is given by k1,Ar = 3.48 × 10-10 exp (-257kJ/RT) cm3 molecule-1 s-1. The relative Chaperone efficiencies at 2 atm were determined as k1,He/k1,Ar = 2.68, k1,N2/k1,Ar = 1.85, and k1,CO2/k1,Ar = 3.67 through our experiments. Our results provide new insights into OCS kinetics, marking the first systematic study of its pressure-dependent behavior in exoplanetary-relevant conditions. These findings, underscored by low experimental uncertainties (±9.0% for k1,Ar, ±12% for k1,He, ±18% for k1,N2, and ±24% for k1,CO2) reflect high-quality, repeatable measurements that will support sulfur chemistry atmospheric modeling and enhance the interpretation of spectroscopic observations from missions such as the James Webb Space Telescope (JWST).

  View details for DOI 10.1021/acs.jpca.5c07383

  View details for PubMedID 41608828

• Vibrational-state-resolved relaxation and chemistry of carbon monoxide and nitrogen mixtures from 2000-10 250 K probing carbon monoxide in the ground to twelfth excited vibrational levels (vol37, 096112 , 2025) PHYSICS OF FLUIDS Streicher, J. W., Merrell, D. P., Strand, C. L., Hanson, R. K., Aiken, T. T., Andrienko, D. A., Boyd, I. D. 2025; 37 (12)

  View details for DOI 10.1063/5.0311187

  View details for Web of Science ID 001633845000014

• Ring-amplified shock tube for variable-gain, multi-wavelength absorption spectroscopy OPTICS EXPRESS Strand, C. L., Merrell, D., Thoeny, A., Streicher, J. W., Hanson, R. K. 2025; 33 (20): 42653-42676

  View details for DOI 10.1364/OE.571994

  View details for Web of Science ID 001589698900008

• High temperature collisional broadening of the oxygen A-band for partners O₂, N₂, and Ar JOURNAL OF QUANTITATIVE SPECTROSCOPY & RADIATIVE TRANSFER Merrell, D. P., Thoeny, A., Strand, C. L., Hanson, R. K. 2026; 348

  View details for DOI 10.1016/j.jqsrt.2025.109683

  View details for Web of Science ID 001590481800003

• Vibrational-state-resolved relaxation and chemistry of carbon monoxide and nitrogen mixtures from 2000-10 250 K probing carbon monoxide in the ground to twelfth excited vibrational levels PHYSICS OF FLUIDS Streicher, J. W., Merrell, D. P., Strand, C. L., Hanson, R. K., Aiken, T. T., Andrienko, D. A., Boyd, I. D. 2025; 37 (9)

  View details for DOI 10.1063/5.0290858

  View details for Web of Science ID 001564242200016

• Laser-absorption sensor suite for crank-angle-resolved,<i> in</i><i> situ</i> measurements in the exhaust of a high-performance internal combustion engine-I: temperature and H2O APPLIED OPTICS Clees, S., Santos, J. P., Vandervort, J. A., Strand, C. L., Hanson, R. K., Ghonim, A., French, B., Gilmour, A., Ferlet, X. 2025; 64 (19): 5499-5508

  View details for DOI 10.1364/AO.564692

  View details for Web of Science ID 001524140000035

• Laser-absorption sensor suite for crank-angle-resolved,<i> in</i><i> situ</i> measurements in the exhaust of a high-performance internal combustion engine-II: CO, CO2, and unburned hydrocarbons APPLIED OPTICS Vandervort, J. A., Clees, S., Santos, J. P., Strand, C. L., Hanson, R. K., Ghonim, A., French, B., Gilmour, A., Ferlet, X. 2025; 64 (19): 5509-5518

  View details for DOI 10.1364/AO.564602

  View details for Web of Science ID 001524140000036

• Temperature and Enthalpy Characterization of NASA Arcjet Using Oxygen and Nitrogen Absorption JOURNAL OF THERMOPHYSICS AND HEAT TRANSFER Finch, P. M., Granowitz, Z. N., Strand, C. L., Hanson, R. K., MacDonald, M. E., Hui, F. C. L., Gokcen, T. 2025

  View details for DOI 10.2514/1.T7088

  View details for Web of Science ID 001466756400001

• Simultaneous spatially resolved temperature, pressure, and velocity measurements in high-enthalpy gas environments using spectrally resolved laser-induced fluorescence of potassium vapor (vol 131, 4, 2025) APPLIED PHYSICS B-LASERS AND OPTICS Vandervort, J. A., Barnes, S. C., Clees, S., Strand, C. L., Hanson, R. K. 2025; 131 (4)

  View details for DOI 10.1007/s00340-025-08440-z

  View details for Web of Science ID 001449485600001

• A laser-absorption diagnostic for O₂ concentration and temperature using a portable, tunable UV laser system APPLIED PHYSICS B-LASERS AND OPTICS Barnes, S. C., Clees, S., Vandervort, J. A., Rault, T. M., Streicher, J. W., Strand, C. L., Hanson, R. K. 2025; 131 (4)

  View details for DOI 10.1007/s00340-025-08444-9

  View details for Web of Science ID 001449545700003

• Simultaneous spatially resolved temperature, pressure, and velocity measurements in high-enthalpy gas environments using spectrally resolved laser-induced fluorescence of potassium vapor APPLIED PHYSICS B-LASERS AND OPTICS Vandervort, J. A., Barnes, S. C., Clees, S., Strand, C. L., Hanson, R. K. 2025; 131 (3)

  View details for DOI 10.1007/s00340-025-08404-3

  View details for Web of Science ID 001420238200002

• A shock tube study of chaperon efficiencies for the NH3+M-NH2+H + M reaction during ammonia pyrolysis PROCEEDINGS OF THE COMBUSTION INSTITUTE Simha, P., Rault, T. M., Clees, S., Streicher, J. W., Strand, C. L., Hanson, R. K. 2025; 41

  View details for DOI 10.1016/j.proci.2025.105797

  View details for Web of Science ID 001558898600002

• A Rapidly Tunable Laser System for Measurements of NH2 at 597 nm Behind Reflected Shock Waves. Sensors (Basel, Switzerland) Clees, S., Barnes, S. C., Rault, T. M., Strand, C. L., Hanson, R. K. 2024; 24 (24)

  Abstract

  Distributed feedback lasers, which feature rapid wavelength tunability, are not presently available in the yellow and orange spectral regions, impeding spectroscopic studies of short-lived species that absorb light in this range. To meet this need, a rapidly tunable laser system was constructed, characterized, and demonstrated for measurements of the NH2 radical at 597.4 nm. The system consisted of three main parts: (1) a distributed feedback diode laser operating at 1194.8 nm, (2) a fiber-coupled optical amplifier, and (3) a periodically poled lithium niobate (PPLN) waveguide for second-harmonic generation. A phase-matching optical frequency bandwidth of 118 GHz and a second-harmonic generation efficiency of 109%/W were determined for the PPLN waveguide, and the intensity and wavelength stability of the system were measured. The rapid-tuning capabilities of the laser system were characterized to explore its potential for use in scanned-direct absorption and wavelength modulation spectroscopy experiments. The feasibility of scanned-direct absorption up to a scan rate of 900 kHz and wavelength modulation spectroscopy at modulation frequencies up to 800 kHz were demonstrated. Finally, the system was deployed in a series of shock tube experiments in which the concentration of NH2 radicals was measured during the decomposition of NH3 behind reflected shock waves.

  View details for DOI 10.3390/s24247920

  View details for PubMedID 39771657

  View details for PubMedCentralID PMC11679085

• Measurement of hydrogen and nitrogen via collision-induced infrared absorption INTERNATIONAL JOURNAL OF HYDROGEN ENERGY Wei, C., Klingberg, A., Strand, C. L., Hanson, R. K. 2024; 93: 364-373

  View details for DOI 10.1016/j.ijhydene.2024.10.318

  View details for Web of Science ID 001350370000001

• Collisional broadening and pressure shift coefficients for the potassium D1 and D2 transitions in oxygen and carbon dioxide at high temperatures JOURNAL OF QUANTITATIVE SPECTROSCOPY & RADIATIVE TRANSFER Vandervort, J. A., Kotsarinis, K., Barnes, S. C., Strand, C. L., Hanson, R. K. 2024; 328

  View details for DOI 10.1016/j.jqsrt.2024.109152

  View details for Web of Science ID 001299285700001

• A Rapidly Tunable Laser System for Measurements of NH₂ at 597 nm Behind Reflected Shock Waves SENSORS Clees, S., Barnes, S. C., Rault, T. M., Strand, C. L., Hanson, R. K. 2024; 24 (24)

  View details for DOI 10.3390/s24247920

  View details for Web of Science ID 001386928700001

• Shock-Layer Measurements in T5 Shock Tunnel Hypersonic Flows Around a Cylinder Model AIAA JOURNAL Finch, P. M., Girard, J. J., Schwartz, T., Strand, C. L., Hanson, R. K., Yu, W. M., Austin, J. M., Hornung, H. G., Gross, T., Schwartzentruber, T. E. 2024

  View details for DOI 10.2514/1.J063877

  View details for Web of Science ID 001296258800001

• Experimental temperature- and pressure-dependent absorbance cross sections and a pseudo-line-list model for methyl formate near 5.7 . 7 μm JOURNAL OF QUANTITATIVE SPECTROSCOPY & RADIATIVE TRANSFER Su, W., Ding, Y., Strand, C. L., Hanson, R. K. 2024; 327

  View details for DOI 10.1016/j.jqsrt.2024.109128

  View details for Web of Science ID 001293622800001

• A laser diagnostic for lineshape-based gas temperature and pressure measurements targeting a single atomic potassium absorption transition APPLIED PHYSICS B-LASERS AND OPTICS Vandervort, J. A., Schwartz, T., Barnes, S. C., Strand, C. L., Hanson, R. K. 2024; 130 (7)

  View details for DOI 10.1007/s00340-024-08252-7

  View details for Web of Science ID 001242906600001

• Development of a vapor-based method for seeding alkali metals in shock tube facilities SHOCK WAVES Vandervort, J. A., Barnes, S. C., Strand, C. L., Hanson, R. K. 2024; 34 (1): 61-67

  View details for DOI 10.1007/s00193-024-01165-6

  View details for Web of Science ID 001207728800004

• Fiber-coupled optical probe for laser absorption diagnostics in shock tube experiments with high concentrations of non-monatomic species PROCEEDINGS OF THE COMBUSTION INSTITUTE Wei, C., Knubben, J. C., Strand, C. L., Hanson, R. K. 2024; 40 (1-4)

  View details for DOI 10.1016/j.proci.2024.105483

  View details for Web of Science ID 001273551200001

• Simulations of Non-Equilibrium Air Chemistry Compared To Hypersonic Wind Tunnel Experiments Gross, T. J., Torres, E., Schwartzentruber, T. E., Finch, P. M., Girard, J. J., Schwartz, T., Granowitz, Z. N., Strand, C. L., Hanson, R. K., Yu, W. M., Austin, J. M., Hornung, H. G., AIAA AMER INST AERONAUTICS & ASTRONAUTICS. 2024

  View details for Web of Science ID 001375987902032

• High-Frequency Static Pressure Measurements in the T5 Reflected Shock Tunnel Yu, W. M., Luo, Y., Austin, J. M., Hornung, H. G., Finch, P. M., Schwartz, T., Strand, C. L., Hanson, R. K., AIAA AMER INST AERONAUTICS & ASTRONAUTICS. 2024

  View details for Web of Science ID 001375995207024

• Laser Absorption Sensor Targeting Potassium for Hypersonic Velocity, Temperature, and Enthalpy Measurements AIAA JOURNAL Schwartz, T., Finch, P. M., Strand, C. L., Hanson, R. K., Luo, Y., Yu, W. M., Austin, J. M., Hornung, H. G. 2023

  View details for DOI 10.2514/1.J062620

  View details for Web of Science ID 001003665400001

• Shock-Tube Measurements of Atomic Nitrogen Collisional Excitation in 8000-12000 K Partially Ionized Nitrogen-Argon Mixtures. The journal of physical chemistry. A Finch, P. M., Granowitz, Z. N., Streicher, J. W., Krish, A., Strand, C. L., Hanson, R. K. 2023

  Abstract

  We report on shock-tube experiments measuring the collisional excitation of atomic nitrogen using tunable diode laser absorption spectroscopy (TDLAS). Conditions behind the reflected shocks ranged from 8000 to 12000 K and 0.1 to 1.1 atm in mixtures of 1 or 2% molecular nitrogen (N2) in argon (Ar). Absorption from the transition between atomic nitrogen quantum states 4P to 4D at 868 nm was used to monitor the formation of electronically excited nitrogen. Population measurements of the 4P state were made at a rate of 50 kHz. In connection with these measurements, a multitemperature kinetic mechanism is proposed for nitrogen excitation. Measurements suggest a multistage process. In early test times, a period of induction due to N2 dissociation is followed by a rise via heavy particle excitation. The dominant channel causing this excitation is believed to be N + N N(4P) + N with a measured forward rate constant of 3.65 * 10-18 exp(-119892/T) [m3/s]. As test time evolves, the excitation of 4P, referred to as N*, is subsequently interrupted and then resumes, as the kinetic environment becomes increasingly electron-dominated. The most impactful reactions of the mechanism are optimized to reduce the residual between simulations and the measurements. The measured N* populations indicate strong, though indirect, sensitivity to adjacent processes, including the excitation of metastable nitrogen, and ionization channels.

  View details for DOI 10.1021/acs.jpca.2c07839

  View details for PubMedID 36745871

• Measurements of T5 Shock Tunnel Freestream Temperature, Velocity, and Composition AIAA JOURNAL Finch, P. M., Girard, J. J., Schwartz, T., Strand, C. L., Hanson, R. K., Yu, W. M., Austin, J. M., Hornung, H. G. 2023

  View details for DOI 10.2514/1.J062383

  View details for Web of Science ID 000924854700001

• A laser-absorption sensor for in situ detection of biofuel blend vapor in engine intakes PROCEEDINGS OF THE COMBUSTION INSTITUTE Clees, S., Cha, D. H., Biswas, P., Boddapati, V., Cassady, S. J., Strand, C. L., Hanson, R. K., French, B., Gilmour, A., Hawk, K. C., Stitt, J. M., Ferlet, X. 2023; 39 (1): 1307-1316

  View details for DOI 10.1016/j.proci.2022.07.110

  View details for Web of Science ID 001019044900001

• Line mixing study of carbon monoxide near 4.7 mu m broadened by nitrogen, helium, and hydrogen JOURNAL OF MOLECULAR SPECTROSCOPY Su, W., Ding, Y., Strand, C. L., Hanson, R. K. 2022; 390

  View details for DOI 10.1016/j.jms.2022.111699

  View details for Web of Science ID 000904449500001

• Collisional broadening and pressure shift of the potassium resonance doublets by nitrogen, helium, and hydrogen at high temperatures JOURNAL OF QUANTITATIVE SPECTROSCOPY & RADIATIVE TRANSFER Ding, Y., Vandervort, J. A., Freedman, R. S., Strand, C. L., Marley, M. S., Hanson, R. K. 2022; 283

  View details for DOI 10.1016/j.jqsrt.2022.108149

  View details for Web of Science ID 000792886800015

• Investigating Arcjet Mixing and Enthalpy Loss Using Atomic Oxygen Laser Absorption Spectroscopy AIAA JOURNAL Salazar, D., Strand, C. L., Hanson, R. K., MacDonald, M. E. 2022; 60 (2): 976-984

  View details for DOI 10.2514/1.J060274

  View details for Web of Science ID 000802220400034

• Line mixing study on the fundamental rovibrational band of nitric oxide near 5.3 mu m JOURNAL OF QUANTITATIVE SPECTROSCOPY & RADIATIVE TRANSFER Su, W., Boulet, C., Almodovar, C. A., Ding, Y., Strand, C. L., Hanson, R. K. 2022; 278

  View details for DOI 10.1016/j.jqsrt.2021.107997

  View details for Web of Science ID 000748572100014

• Measurements of Reflected Shock Tunnel Freestream Nitric Oxide Temperatures and Partial Pressure AIAA JOURNAL Girard, J. J., Finch, P. M., Strand, C. L., Hanson, R. K., Yu, W. M., Austin, J. M., Hornung, H. G. 2021; 59 (12): 5266-5275

  View details for DOI 10.2514/1.J060596

  View details for Web of Science ID 000800025200032

• Thermometry and speciation for high-temperature and -pressure methane pyrolysis using shock tubes and dual-comb spectroscopy MEASUREMENT SCIENCE AND TECHNOLOGY Pinkowski, N. H., Biswas, P., Shao, J., Strand, C. L., Hanson, R. K. 2021; 32 (12)

  View details for DOI 10.1088/1361-6501/ac22ef

  View details for Web of Science ID 000702061800001

• Line mixing in the nitric oxide R-branch near 5.2 mu m at high pressures and temperatures: Measurements and empirical modeling using energy gap fitting JOURNAL OF QUANTITATIVE SPECTROSCOPY & RADIATIVE TRANSFER Almodovar, C. A., Su, W., Choudhary, R., Shao, J., Strand, C. L., Hanson, R. K. 2021; 276

  View details for DOI 10.1016/j.jqsrt.2021.107935

  View details for Web of Science ID 000709765300010

• Shock tube measurements of high-temperature argon broadening and shift parameters for the potassium D1 and D2 resonance transitions JOURNAL OF QUANTITATIVE SPECTROSCOPY & RADIATIVE TRANSFER Ding, Y., Vandervort, J. A., Strand, C. L., Hanson, R. K. 2021; 275

  View details for DOI 10.1016/j.jqsrt.2021.107895

  View details for Web of Science ID 000704000000003

• Quantum-cascade-laser-based dual-comb thermometry and speciation at high temperatures MEASUREMENT SCIENCE AND TECHNOLOGY Pinkowski, N. H., Cassady, S. J., Strand, C. L., Hanson, R. K. 2021; 32 (3)

  View details for DOI 10.1088/1361-6501/abc029

  View details for Web of Science ID 000621888000001

• Scientific accomplishments and research avenues of Professor Ronald Hanson COMBUSTION AND FLAME Davidson, D. F., Jeffries, J. B., Oehlschlaeger, M. A., Strand, C. L. 2021; 224: 2–5

  View details for DOI 10.1016/j.combustflame.2020.08.039

  View details for Web of Science ID 000609127800002

• Development of a Stark shift measurement technique using excited-state oxygen atoms to determine electron number density in shock heated O-2/Ar above 10 000 K PLASMA SOURCES SCIENCE & TECHNOLOGY Li, Y., Wang, S., Strand, C. L., Hanson, R. K. 2021; 30 (2)

  View details for DOI 10.1088/1361-6595/abdd12

  View details for Web of Science ID 000625362300001

• Time-resolved, single-ended laser absorption thermometry and H2O, CO2, and CO speciation in a H-2/C2H4-fueled rotating detonation engine PROCEEDINGS OF THE COMBUSTION INSTITUTE Cassady, S. J., Peng, W., Strand, C. L., Dausen, D. F., Codoni, J. R., Brophy, C. M., Hanson, R. K. 2021; 38 (1): 1719-1727

  View details for DOI 10.1016/j.proci.2020.06.125

  View details for Web of Science ID 000668887400018

• An In Situ Laser-Absorption Sensor for Crank Angle-Resolved Temperature, Pressure, and Humidity in Intake-Runner Flows SAE INTERNATIONAL JOURNAL OF ENGINES Cassady, S. J., Cha, D. H., Pinkowski, N. H., Strand, C. L., Hanson, R. K., Ferlet, X., French, B., Mernone, B. J., Gilmour, A., Stitt, J. M. 2021; 14 (4): 551-568

  View details for DOI 10.4271/03-14-04-0034

  View details for Web of Science ID 000739430500007

• Temperature-dependent absorption cross section measurements for propene, 1-butene, cis-/trans-2-butene, isobutene and 1,3-butadiene in the spectral region 8.4-11.7 mu m JOURNAL OF QUANTITATIVE SPECTROSCOPY & RADIATIVE TRANSFER Ding, Y., Su, W., Johnson, S. E., Strand, C. L., Hanson, R. K. 2020; 255

  View details for DOI 10.1016/j.jqsrt.2020.107240

  View details for Web of Science ID 000581971300017

• Two-color frequency-multiplexed IMS technique for gas thermometry at elevated pressures APPLIED PHYSICS B-LASERS AND OPTICS Wei, W., Peng, W., Wang, Y., Shao, J., Strand, C. L., Hanson, R. K. 2020; 126 (3)

  View details for DOI 10.1007/s00340-020-7396-4

  View details for Web of Science ID 000519937700002

• Analysis of laser absorption gas sensors employing scanned-wavelength modulation spectroscopy with 1f-phase detection APPLIED PHYSICS B-LASERS AND OPTICS Peng, W., Strand, C. L., Hanson, R. K. 2020; 126 (1)

  View details for DOI 10.1007/s00340-019-7369-7

  View details for Web of Science ID 000503696100001

• Dual-comb Spectroscopy for High-temperature Reaction Kinetics Measurement Science and Technology Pinkowski, N. H., Ding, Y., Strand, C. L., Horvath, R., Geiser, M. 2020

  View details for DOI 10.1088/1361-6501/ab6ecc

• Two-temperature Collisional-radiative Modeling of Partially Ionized O2-Ar Mixtures over 8000-10,000 K Behind Reflected Shock Waves. The journal of physical chemistry. A Li, Y. n., Wang, S. n., Strand, C. L., Hanson, R. K. 2020

  Abstract

  The collisional excitation kinetics of atomic oxygen was studied behind reflected shock waves using tunable diode laser absorption spectroscopy. A test gas mixture of 1% O2/Ar was shock-heated to temperatures between 8000 and 10,000 K and pressures between 0.15 and 1 atm. The time evolution of the atomic oxygen population in the 3 s 5S0 state was monitored by laser absorption at 777.2 nm. The measured O(3 s 5S0) population revealed multistage behavior that was not observed in previous measurements over a temperature range of 5300-7200 K. To interpret the multistage behavior, a three-level collisional-radiative model for atomic oxygen excitation kinetics was developed. The model utilized two independent temperatures, that is, heavy particle translational temperature Ttr and electron translational temperature Te, to describe the fundamental rate constants of atomic oxygen excitation because of collisions with heavy particles and electrons, respectively. The heavy particle excitation rate was inferred from the early stage of the measurement to be k(3P →5S0) = 3.4 × 10-27 (T/K)0.5(1.061 × 105 + 2 (T/K)) exp(-1.061 × 105 K/T) ± 50% m3 s-1. The electron impact excitation rate constant of oxygen, electron impact, and heavy particle impact ionization rate constants of Argon were modified in the model to match the experimental population time histories. The modified rate parameters are also reported for the temperature range explored in the current study.

  View details for DOI 10.1021/acs.jpca.0c00466

  View details for PubMedID 32306734

• Calibration-free breath acetone sensor with interference correction based on wavelength modulation spectroscopy near 8.2 mu m APPLIED PHYSICS B-LASERS AND OPTICS Schwarm, K. K., Strand, C. L., Miller, V. A., Spearrin, R. 2020; 126 (1)

  View details for DOI 10.1007/s00340-019-7358-x

  View details for Web of Science ID 000511618600001

• R-branch line intensities and temperature-dependent line broadening and shift coefficients of the nitric oxide fundamental rovibrational band JOURNAL OF QUANTITATIVE SPECTROSCOPY & RADIATIVE TRANSFER Almodovar, C. A., Su, W., Strand, C. L., Hanson, R. K. 2019; 239

  View details for DOI 10.1016/j.jqsrt.2019.106612

  View details for Web of Science ID 000504780100002

• High-pressure, high-temperature optical cell for mid-infrared spectroscopy JOURNAL OF QUANTITATIVE SPECTROSCOPY & RADIATIVE TRANSFER Almodovar, C. A., Su, W., Strand, C. L., Sur, R., Hanson, R. K. 2019; 231: 69–78

  View details for DOI 10.1016/j.jqsrt.2019.04.014

  View details for Web of Science ID 000469898100009

• A two-wavelength ethylene-absorption temperature diagnostic MEASUREMENT SCIENCE AND TECHNOLOGY Cassady, S. J., Susa, A. J., Ferris, A. M., Strand, C. L., Hanson, R. K. 2019; 30 (3)

  View details for DOI 10.1088/1361-6501/ab02cf

  View details for Web of Science ID 000459139700001

• Single-Ended Sensor for Thermometry and Speciation in Shock Tubes Using Native Surfaces IEEE Sensors Journal Peng, W. Y., Wang, Y., Cassady, S. J., Strand, C. L., Hanson, R. K. 2019

  View details for DOI 10.1109/JSEN.2019.2903989

• Single-ended mid-infrared laser-absorption sensor for time-resolved measurements of water concentration and temperature within the annulus of a rotating detonation engine PROCEEDINGS OF THE COMBUSTION INSTITUTE Peng, W., Cassady, S. J., Strand, C. L., Goldenstein, C. S., Spearrin, R., Brophy, C. M., Jeffries, J. B., Hanson, R. K. 2019; 37 (2): 1435–43

  View details for DOI 10.1016/j.proci.2018.05.021

  View details for Web of Science ID 000456621500020

• Mid-infrared laser absorption spectroscopy of NO2 at elevated temperatures JOURNAL OF QUANTITATIVE SPECTROSCOPY & RADIATIVE TRANSFER Sur, R., Peng, W. Y., Strand, C., Spearrin, R. M., Jeffries, J. B., Hanson, R. K., Bekal, A., Haider, P., Poonacha, S. P., Vartak, S., Sridharan, A. K. 2017; 187: 364-374

  View details for DOI 10.1016/j.jqsrt.2016.10.016

  View details for Web of Science ID 000391899300036

• Line intensities and temperature-dependent line broadening coefficients of Q-branch transitions in the v(2) band of ammonia near 10.4 mu m JOURNAL OF QUANTITATIVE SPECTROSCOPY & RADIATIVE TRANSFER Sur, R., Spearrin, R. M., Peng, W. Y., Strand, C. L., Jeffries, J. B., Enns, G. M., Hanson, R. K. 2016; 175: 90-99

  View details for DOI 10.1016/j.jqsrt.2016.02.002

  View details for Web of Science ID 000373542700009

• Line intensities and temperature-dependent line broadening coefficients of Q-branch transitions in the v2 band of ammonia near 10.4 μm. Journal of quantitative spectroscopy & radiative transfer Sur, R., Spearrin, R. M., Peng, W. Y., Strand, C. L., Jeffries, J. B., Enns, G. M., Hanson, R. K. 2016; 175: 90-99

  Abstract

  We report measured line intensities and temperature-dependent broadening coefficients of NH3 with Ar, N2, O2, CO2, H2O, and NH3 for nine sQ(J,K) transitions in the ν2 fundamental band in the frequency range 961.5-967.5 cm-1. This spectral region was chosen due to the strong NH3 absorption strength and lack of spectral interference from H2O and CO2 for laser-based sensing applications. Spectroscopic parameters were determined by multi-line fitting using Voigt lineshapes of absorption spectra measured with two quantum cascade lasers in thermodynamically-controlled optical cells. The temperature dependence of broadening was measured over a range of temperatures between 300 and 600 K. These measurements aid the development of mid-infrared NH3 sensors for a broad range of gas mixtures and at elevated temperatures.

  View details for DOI 10.1016/j.jqsrt.2016.02.002

  View details for PubMedID 29225373

  View details for PubMedCentralID PMC5722251

• Quantification of Supersonic Impulse Flow Conditions via High-Bandwidth Wavelength Modulation Absorption Spectroscopy AIAA JOURNAL Strand, C. L., Hanson, R. K. 2015; 53 (10): 2978-2987

  View details for DOI 10.2514/1.J053842

  View details for Web of Science ID 000361468800014

• Hypersonic Scramjet Testing via Diode Laser Absorption in a Reflected Shock Tunnel JOURNAL OF PROPULSION AND POWER Schultz, I. A., Goldenstein, C. S., Strand, C. L., Jeffries, J. B., Hanson, R. K., Goyne, C. P. 2014; 30 (6): 1586-1594

  View details for DOI 10.2514/1.B35220

  View details for Web of Science ID 000344145000018

• Fitting of calibration-free scanned-wavelength-modulation spectroscopy spectra for determination of gas properties and absorption lineshapes APPLIED OPTICS Goldenstein, C. S., Strand, C. L., Schultz, I. A., Sun, K., Jeffries, J. B., Hanson, R. K. 2014; 53 (3): 356-367

  Abstract

  The development and initial demonstration of a scanned-wavelength, first-harmonic-normalized, wavelength-modulation spectroscopy with nf detection (scanned-WMS-nf/1f) strategy for calibration-free measurements of gas conditions are presented. In this technique, the nominal wavelength of a modulated tunable diode laser (TDL) is scanned over an absorption transition to measure the corresponding scanned-WMS-nf/1f spectrum. Gas conditions are then inferred from least-squares fitting the simulated scanned-WMS-nf/1f spectrum to the measured scanned-WMS-nf/1f spectrum, in a manner that is analogous to widely used scanned-wavelength direct-absorption techniques. This scanned-WMS-nf/1f technique does not require prior knowledge of the transition linewidth for determination of gas properties. Furthermore, this technique can be used with any higher harmonic (i.e., n>1), modulation depth, and optical depth. Selection of the laser modulation index to maximize both signal strength and sensitivity to spectroscopic parameters (i.e., gas conditions), while mitigating distortion, is described. Last, this technique is demonstrated with two-color measurements in a well-characterized supersonic flow within the Stanford Expansion Tube. In this demonstration, two frequency-multiplexed telecommunication-grade TDLs near 1.4 μm were scanned at 12.5 kHz (i.e., measurement repetition rate of 25 kHz) and modulated at 637.5 and 825 kHz to determine the gas temperature, pressure, H₂O mole fraction, velocity, and absorption transition lineshape. Measurements are shown to agree within uncertainty (1%-5%) of expected values.

  View details for DOI 10.1364/AO.53.000356

  View details for Web of Science ID 000330172300007

  View details for PubMedID 24514120

• Supersonic Mass-Flux Measurements via Tunable Diode Laser Absorption and Nonuniform Flow Modeling 49th AIAA Aerospace Sciences Meeting / New Horizons Forum and Aerospace Exposition Chang, L. S., Strand, C. L., Jeffries, J. B., Hanson, R. K., Diskin, G. S., Gaffney, R. L., Capriotti, D. P. AMER INST AERONAUT ASTRONAUT. 2011: 2783–91

  View details for DOI 10.2514/1.J051118

  View details for Web of Science ID 000297968200017