Gas cell based on optical contacting for fundamental spectroscopy studies with initial reference absorption spectrum of H2O vapor at 1723 K and 0.0235 bar.pdfVIP

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Gas cell based on optical contacting for fundamental spectroscopy studies with initial reference absorption spectrum of H2O vapor at 1723 K and 0.0235 bar.pdf

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Gas cell based on optical contacting for fundamental spectroscopy studies with initial reference absorption spectrum of H2O vapor at 1723 K and 0.0235 bar.pdf

Journal of Quantitative Spectroscopy Radiative Transfer 180 (2016) 184–191 Contents lists available at ScienceDirect Journal of Quantitative Spectroscopy Radiative Transfer journal homepage: /locate/jqsrt Gas cell based on optical contacting for fundamental spectroscopy studies with initial reference absorption spectrum of H2O vapor at 1723 K and 0.0235 bar Scott T. Melin n, Scott T. Sanders Engine Research Center, University of Wisconsin-Madison, 1500 Engineering Drive, Madison, WI 53706, USA article info Article history: Received 15 January 2016 Received in revised form 12 April 2016 Accepted 13 April 2016 Available online 16 April 2016 Keywords: High-temperature spectroscopy Infrared water vapor absorption Gas cell Optical contacting Reference spectra Fundamental spectroscopy abstract A gas cell, using optically contacted sapphire windows to form a hot vapor seal, has been created for high temperature fundamental spectroscopy studies. It is designed to operate at temperatures from 280–2273 K and pressures from vacuum to 1.3 bar. Using the cell in conjunction with an external cavity diode laser spectrometer, a reference H2O vapor absorption spectrum at P? 0.02357 0.0036 bar and T ? 17237 6 K was measured with 0.0001 cmà1 resolution over the 7326–7598 cmà1 range. Comparison of the measured spectrum to simulations reveals errors in both the HITEMP and BT2 databases. This work establishes heated static cell capabilities at temperatures well above the typical limit of approximately 1300 K set by quartz material properties. This paper addresses the design of the cell as well as the cells limitations. 2016 Elsevier Ltd. All rights reserved. 1. Introduction Many applications within the ?eld of spectroscopic measurement make use of high-temperature spectroscopic databases for small molecules, including H2O, OH, CO2, CO, NO, and O2. A variety of techniques have been developed for high-temperature studies across a broad range of applications including radiative heat tran