High-pressure and high-temperature gas cell for absorption spectroscopy studies at wavelengths up to 8 µm

Schwarm, Kevin K.; Dinh, Huy Q.; Goldenstein, Christopher S.; Pineda, Daniel I.; Spearrin, R. Mitchell

doi:10.1016/j.jqsrt.2019.01.029

Cited by 30 publications

(19 citation statements)

References 17 publications

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“…Rieker et al (2007) measured near-infrared absorption spectra of water vapor by using tunable diode lasers and a heatable Inconel cell with a path length of 37.6 cm, equipped with tapered sapphire windows and copper seals. Schwarm et al (2019) constructed an absorption cell for spectroscopic measurements in the mid-infrared range capable of withstanding pressures up to 200 atm and temperatures up to 1200 K. Such high temperatures are of particular interest for combustion processes. They used CaF 2 or sapphire rods with a length of 15 cm, sealed with a high-temperature epoxy on cooled endcaps, while only the central part of the absorption cell was heated in a furnace.…”

Section: Heatable and Coolable Absorption Cells In The Literaturementioning

confidence: 99%

A simulation chamber for absorption spectroscopy in planetary atmospheres

et al. 2021

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Abstract. A novel simulation chamber, PASSxS (Planetary Atmosphere Simulation System for Spectroscopy), has been developed for absorption measurements performed with a Fourier transform spectrometer (FTS) and, possibly, a cavity ring-down (CRD) spectrometer with a sample temperature ranging from 100 up to 550 K, while the pressure of the gas can be varied from 10 mbar up to 60 bar. These temperature and pressure ranges cover a significant part of the planetary atmospheres in the solar system, and the absorption chamber can thus be used to simulate planetary atmospheres of solar planets and extrasolar planets with similar physical conditions. The optical absorption path for the FTS absorption measurements is 3.2 m due to the implementation of a multi-pass setup inside the chamber. The FTS measurements cover a wide spectral range, from the visible to the mid-infrared, with a sensitivity sufficient for medium-strength absorption bands. The FTS has been used previously to measure high-pressure atmospheres, including collision-induced absorption bands and continuum absorption at ambient temperatures. PASSxS allows the measurement of the temperature dependence of collision-induced bands and continuum absorption, which is important for both the modeling of planetary atmospheres and fundamental processes involving collisions between molecules and atoms.

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Section: Heatable and Coolable Absorption Cells In The Literaturementioning

confidence: 99%

A simulation chamber for absorption spectroscopy in planetary atmospheres

et al. 2021

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“…Rieker et al (2007) measured near-infrared anbsorption spectra of water vapor, by using tunable diode lasers and a heatable Inconel cell with a pathlength of 37.6 cm, equipped with tapered sapphire windows and copper seals. Schwarm et al (2019) constructed an absorption cell for spectroscopic measurements in the mid-infrared range, capable to withstand pressures up to CaF 2 or sapphire rods with a length of 15 cm, sealed with a high-temperature epoxy to cooled end caps, while only the central part of the absorption cell was heated in a furnace. They reported a temperature uniformity of ± 7 K at 542 K in the 9 cm long absorption cell .…”

Section: Heatable and Coolable Absorption Cells In Literaturementioning

confidence: 99%

A simulation chamber for absorption spectroscopy in planetary atmospheres

Snels

Stefani

Boccaccini

et al. 2021

Preprint

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Abstract. A novel simulation chamber PASSxS (Planetary Atmosphere Simulation System for Spectroscopy) has been developed for absorption measurements performed with a Fourier Transform Spectrometer (FTS) and, possibly, a cavity ring down (CRD) spectrometer, with a sample temperature ranging from 100 K up to 550 K, while the pressure of the gas can be varied from 10 mbar up to 60 bar. These temperature and pressure ranges cover a significant part of the planetary atmospheres in the solar system and the absorption chamber can thus be used to simulate planetary atmospheres of solar planets and extra solar planets with similar atmospheres. The optical absorption path for the FTS absorption measurements is 3.2 m, due to the implementation of a multipass setup inside the chamber. The FTS measurements cover a wide spectral range, from the visible to the mid-infrared with a sensitivity sufficient for medium strength absorption bands. The FTS has been used previously to measure high pressure atmospheres, including collision induced absorption bands and continuum absorption at ambient temperatures. PASSxS allows to measure the temperature dependence of collision induced bands and continuum absorption, which is important both for the modelling of planetary atmospheres as well as for fundamental processes involving collisions between molecules and atoms.

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“…ULAS measurements were acquired in a high-uniformity, heated, static-gas cell (described by Schwarm et al [24]) to validate the accuracy of the diagnostic at high temperature and pressure, as well as to determine the instrument response function (IRF) via a multi-spectrum fitting routine (MSFR) discussed in detail in Section 4.2. Spectra were measured in a mixture of 2% CO and 1.8% CO 2 by mole with a balance of nitrogen at 1000 ± 20 K and pressures of 0.3, 1, 3, 10, 20, and 40 bar.…”

Section: Gas-cell Experimentsmentioning

confidence: 99%

“…The gas pressure was measured using a UNIK-5000 pressure transducer with a full-scale range of 0 to 70 bar and an accuracy of ± 0.028 bar. Temperature was measured using three type-K thermocouples with a nominal accuracy of 0.75% (at ≥ 600 K) fixed to the outside of the gas cell as in [24]. The gas cell was equipped with 15 cm long, wedged, CaF 2 rods which provided an absorbing path length of 9.4 cm at room temperature.…”

Section: Gas-cell Experimentsmentioning

confidence: 99%

Ultrafast Laser Absorption Spectroscopy in the Mid-Infrared for Measuring Temperature and Species in Combustion Gases

Tancin

Chang

Radhakrishna

et al. 2020

AIAA Scitech 2020 Forum

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This manuscript presents an ultrafast-laser-absorption-spectroscopy (ULAS) diagnostic capable of providing calibration-free, single-shot measurements of temperature and CO at 5 kHz in combustion gases at low and high pressures. A detailed description of the spectralfitting routine, data-processing procedures, determination of the instrument response function, and practical considerations for imaging ultrashort pulses in the mid-infrared are presented. The accuracy of the diagnostic was validated at 1000 K and pressures up to 40 bar in a heated-gas cell before being applied to characterize the spatiotemporal evolution of temperature and CO in AP-HTPB and AP-HTPB-aluminum propellant flames at pressures between 1 and 40 bar. The results presented here demonstrate that ULAS in the mid-IR can provide high-fidelity, calibration-free measurements of gas properties with sub-nanosecond time resolution in harsh, high-pressure combustion environments representative of rocket motors.

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High-pressure and high-temperature gas cell for absorption spectroscopy studies at wavelengths up to 8 µm

Cited by 30 publications

References 17 publications

A simulation chamber for absorption spectroscopy in planetary atmospheres

A simulation chamber for absorption spectroscopy in planetary atmospheres

A simulation chamber for absorption spectroscopy in planetary atmospheres

Ultrafast Laser Absorption Spectroscopy in the Mid-Infrared for Measuring Temperature and Species in Combustion Gases

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