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Multi-band infrared CO2 absorption sensor for sensitive temperature and species measurements in high-temperature gases

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Abstract

A continuous-wave laser absorption diagnostic, based on the infrared CO2 bands near 4.2 and 2.7 μm, was developed for sensitive temperature and concentration measurements in high-temperature gas systems using fixed-wavelength methods. Transitions in the respective R-branches of both the fundamental υ 3 band (~2,350 cm−1) and combination υ 1 + υ 3 band (~3,610 cm−1) were chosen based on absorption line-strength, spectral isolation, and temperature sensitivity. The R(76) line near 2,390.52 cm−1 was selected for sensitive CO2 concentration measurements, and a detection limit of <5 ppm was achieved in shock tube kinetics experiments (~1,300 K). A cross-band, two-line thermometry technique was also established utilizing the R(96) line near 2,395.14 cm−1, paired with the R(28) line near 3,633.08 cm−1. This combination yields high temperature sensitivity (ΔE” = 3,305 cm-1) and expanded range compared with previous intra-band CO2 sensors. Thermometry performance was validated in a shock tube over a range of temperatures (600–1,800 K) important for combustion. Measured temperature accuracy was demonstrated to be better than 1 % over the entire range of conditions, with a standard error of ~0.5 % and µs temporal resolution.

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Acknowledgments

All experiments discussed herein were performed at the High Temperature Gasdynamics Laboratory at Stanford University. Support for these experiments was provided by the Air Force Office of Scientific Research (AFOSR) with Chiping Li as contract monitor. We would also like to acknowledge Andy Tulgestke and Luke Zaczek for their support in operating the shock tube for sensor demonstration.

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  1. High Temperature Gasdynamics Laboratory, Department of Mechanical Engineering, Stanford University, Stanford, CA, 94305, USA

    R. M. Spearrin, W. Ren, J. B. Jeffries & R. K. Hanson

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  1. R. M. Spearrin
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  2. W. Ren
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Correspondence to R. M. Spearrin.

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Spearrin, R.M., Ren, W., Jeffries, J.B. et al. Multi-band infrared CO2 absorption sensor for sensitive temperature and species measurements in high-temperature gases. Appl. Phys. B 116, 855–865 (2014). https://doi.org/10.1007/s00340-014-5772-7

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  • DOI: https://doi.org/10.1007/s00340-014-5772-7

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