Laser Absorption Spectroscopy Measurements of Temperature, Pressure, and NO X<sup>2</sup>Π<sub>1/2</sub>at 500 kHz in Shock-Heated Air

Ruesch, Morgan; Gilvey, Jonathan J.; Daniel, Kyle; Lynch, Kyle P.; Wagner, Justin L.; Goldenstein, Christopher S.

doi:10.2514/6.2022-1526

Cited by 3 publications

(1 citation statement)

References 35 publications

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“…7, increased the scan-depth by one order of magnitude, sufficient to capture multiple rovibrational transitions of CO and CO 2 at several MHz [20]. This type of biastee circuit, modulated at high speeds, has also been employed in several entry-related studies where µs time resolution was needed [27][28][29].…”

Section: High-speed Laser Absorption Spectroscopymentioning

confidence: 99%

Multi-line Boltzmann regression for near-electronvolt temperature and CO sensing via MHz-rate infrared laser absorption spectroscopy

et al. 2022

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A mid-infrared laser absorption technique is developed for sensing of temperature and carbon monoxide (CO) number density from 2000 K to above 9000 K. To resolve multiple rovibrational lines, a distributedfeedback quantum cascade laser (DFB-QCL) is modulated across 80% of its current range using a trapezoidal waveform via a bias-tee circuit. The laser attains a spectral scan depth of 1 cm −1 , at a scan frequency of 1 MHz, which allows for simultaneous measurements of four isolated CO transitions near 2011 cm −1 (4.97 µm) with lower-state energies spanning 3,000 to 42,000 cm −1 . The number density and temperature are calculated using a Boltzmann regression of the four population fractions. This method leverages the information contained in each transition and yields a lower uncertainty than using a single line pair. The sensor is validated in shock tube experiments over a wide range of temperatures and pressures (2300-8100 K, 0.3-3 atm). Measurements behind reflected shock waves are compared to a kinetic model of CO dissociation up to 9310 K and are shown to recover equilibrium conditions. The high temperature range of the sensor is able to resolve rapid species and temperature evolution at near electronvolt conditions making it suitable for investigations of high-speed flows, plasma applications, and high-pressure detonations.

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Section: High-speed Laser Absorption Spectroscopymentioning

confidence: 99%

Multi-line Boltzmann regression for near-electronvolt temperature and CO sensing via MHz-rate infrared laser absorption spectroscopy

et al. 2022

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Towards In-Situ Measurements of Air-Carbon Ablation Products in a Shock Tunnel

Hargis

Daniel

Jans

et al. 2023

AIAA SCITECH 2023 Forum

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Laser Absorption Spectroscopy Measurements of High Pressure and Temperature Aluminum Combustion in a Shock Tube

Daniel

Jans

Murzyn

et al. 2023

AIAA SCITECH 2023 Forum

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Laser Absorption Spectroscopy Measurements of Temperature, Pressure, and NO X²Π_1/2at 500 kHz in Shock-Heated Air

Cited by 3 publications

References 35 publications

Multi-line Boltzmann regression for near-electronvolt temperature and CO sensing via MHz-rate infrared laser absorption spectroscopy

Multi-line Boltzmann regression for near-electronvolt temperature and CO sensing via MHz-rate infrared laser absorption spectroscopy

Towards In-Situ Measurements of Air-Carbon Ablation Products in a Shock Tunnel

Laser Absorption Spectroscopy Measurements of High Pressure and Temperature Aluminum Combustion in a Shock Tube

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Laser Absorption Spectroscopy Measurements of Temperature, Pressure, and NO X2Π1/2at 500 kHz in Shock-Heated Air

Cited by 3 publications

References 35 publications

Multi-line Boltzmann regression for near-electronvolt temperature and CO sensing via MHz-rate infrared laser absorption spectroscopy

Multi-line Boltzmann regression for near-electronvolt temperature and CO sensing via MHz-rate infrared laser absorption spectroscopy

Towards In-Situ Measurements of Air-Carbon Ablation Products in a Shock Tunnel

Laser Absorption Spectroscopy Measurements of High Pressure and Temperature Aluminum Combustion in a Shock Tube

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Product

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Laser Absorption Spectroscopy Measurements of Temperature, Pressure, and NO X²Π_1/2at 500 kHz in Shock-Heated Air