Abstract
This study presents a single-line absorption spectroscopy method for the simultaneous measurement of gas pressure and temperature through diode laser absorption spectroscopy using a single absorption line. In the proposed method, the absorbance loss of an absorption line that may occur during baseline subtraction is predicted, and the gas properties are determined by matching a calculated absorbance to a recovered absorbance using the predicted loss. To verify the proposed method, gas property measurements are conducted for air conditions with a pressure range of 10–100 kPa and a temperature range of 300–500 K. An absorption line in the oxygen A band is selected to measure the gas properties of air. Using the proposed method, it is confirmed that the gas pressure and temperature could be measured within errors of 25 % and 18 %, respectively. When the gas pressure is predetermined using a pressure gauge, the gas temperature can be measured within an error of 14 %.
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This work was supported by the Agency for Defense Development by Korean government (No. UC190056CD).
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Hanseul Shim received his Ph.D. in 2022 from the KAIST, Daejeon, Republic of Korea. He is currently a Postdoctoral Research Associate of the Department of Mechanical Science and Engineering of the University of Illinois at Urbana-Champaign. His research interests include optical flow diagnostics, hypersonic flow, and propulsion.
Gyeongrok Kim received his Master’s degree in 2018 from the KAIST, Daejeon, Republic of Korea. He is currently a Ph.D. candidate of the Department of Aerospace Engineering of KAIST. His research interests include hypersonic flows, flow diagnostics, thermal stress-based material failure, and thermal protection systems.
Sion Jung received his Master’s degree in 2022 from the KAIST, Daejeon, Republic of Korea. He is currently a Ph.D. candidate of the Department of Aerospace Engineering of KAIST. His research interests include hypersonic flows, flow diagnostics, and laser absorption spectroscopy.
Gisu Park received his Ph.D. in 2010 from University of New South Wales. He is currently an Associate Professor of the Department of Aerospace Engineering of KAIST, Daejeon, Republic of Korea. His research interests include hypersonic aerothermodynamics and high-speed ground tests.
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Shim, H., Kim, G., Jung, S. et al. TDL-based spectroscopy for simultaneous measurement of multiple gas properties using a single absorption line. J Mech Sci Technol 37, 1829–1844 (2023). https://doi.org/10.1007/s12206-023-0322-z
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DOI: https://doi.org/10.1007/s12206-023-0322-z