Applied Physics B

, Volume 116, Issue 4, pp 855–865 | Cite as

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

  • R. M. Spearrin
  • W. Ren
  • J. B. Jeffries
  • R. K. Hanson
Article

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 υ3 band (~2,350 cm−1) and combination υ1 + υ3 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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Copyright information

© Springer-Verlag Berlin Heidelberg 2014

Authors and Affiliations

  • R. M. Spearrin
    • 1
  • W. Ren
    • 1
  • J. B. Jeffries
    • 1
  • R. K. Hanson
    • 1
  1. 1.High Temperature Gasdynamics Laboratory, Department of Mechanical EngineeringStanford UniversityStanfordUSA

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