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Temperature Measurement in a Shock Tunnel Using Tunable Diode Laser Absorption Spectroscopy

  • M. Kannan
  • Y. Krishna
  • G. Jagadeesh
  • K. P. J. Reddy
Conference paper

Abstract

Quantitative measurement of the freestream temperature in the test section of a hypersonic shock tunnel, obtained using tunable diode laser absorption spectroscopy (TDLAS) technique, is presented in this work. Water vapor absorption lines near 1392 nm were probed using a vertical-cavity surface-emitting laser scanned at 25,000 Hz to get the time-resolved measurement of temperature in a Mach number M = 8 hypersonic flow. Three different enthalpy cases – 2.57, 2.23, and 2.01 MJ/kg – were studied in the shock tunnel. Freestream temperature was extracted from the absorbance spectra obtained using direct absorption scheme, by using two-line ratio method. The measured temperatures were compared with the theoretically predicted values.

Notes

Acknowledgment

The work presented in this paper has been funded by Defence Research and Development Organization (DRDO) and Science and Engineering Research Board (SERB), Department of Science and Technology (DST), India. The authors acknowledge their support.

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Copyright information

© Springer International Publishing AG, part of Springer Nature 2019

Authors and Affiliations

  • M. Kannan
    • 1
  • Y. Krishna
    • 1
  • G. Jagadeesh
    • 1
  • K. P. J. Reddy
    • 1
  1. 1.Department of Aerospace EngineeringIndian Institute of ScienceBangaloreIndia

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