Authors: Bandy, Alan R.¹; Hillard, M.E.²; Emory, L.E.²

Source: Applied Spectroscopy, Volume 27, Issue 6, Pages 419-490 (November/December 1973) , pp. 421-424(4)

Publisher: Society for Applied Spectroscopy

Abstract:

The performance of the Raman scattering technique for the remote monitoring of temperature and molecular number density in various wind tunnel and engine testing facilities has been experimentally evaluated. Temperature measurements were made by monitoring the pure rotational spectrum of nitrogen and the rotational branch separations of v₂ of CF₄ for temperatures in the range 300 to 1000°K. These measurements yielded an average error of 2.6 and 7.6%, respectively, for temperature measurements at pressures near 1 atm. Molecular number density measurements with 20% error could be made at densities as low as 3.5 × 10⁺²²m⁻³ by monitoring the 8 ← 6 rotational transition of nitrogen, 3.5 × 10⁺²² m⁻³ by monitoring the Q-branch of the fundamental vibrational transition of nitrogen, and 7 × 10⁺²² m⁻³ by monitoring the v₁ fundamental vibrational transition of CF₄.

Keywords: Raman scattering; Applications; Temperature sensor; Molecular density sensor

Document Type: Research article

DOI: http://dx.doi.org/10.1366/000370273774333155

Affiliations: 1: Old Dominion University, Norfolk, Virginia 23508 2: National Aeronautics and Space Administration Langley Research Center, Hampton, Virginia 23665

Publication date: 1973-11-01

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