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Experimental spectroscopic temperature measurement in the reflected wave region of a shock tube using the OH^2∑ → ^2Π band system

Watson, Ronald (1963) Experimental spectroscopic temperature measurement in the reflected wave region of a shock tube using the OH^2∑ → ^2Π band system. Journal of Quantitative Spectroscopy and Radiative Transfer, 3 (3). pp. 255-264. ISSN 0022-4073. doi:10.1016/0022-4073(63)90036-0.

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Experimental measurements of the population temperature behind the reflected shock in a shock tube are presented. Emission from two wave length intervals of the OH^2∑ → ^2Π electronic band system was measured photoelectrically, the signals observed being generated by a narrow core of hot gas in the reflected shock region looking axially up the tube. The ratio of the rate of increase of intensity, per unit increase of optical depth, in the two spectral regions is a unique function of the temperature for a transparent gas. The linearity of the signal increase with time represents an experimental verification of the transparency and equilibrium of the test gas. In the temperature range of 3300-4300°K (M_s ~ 4), the measured spectroscopic temperature was in good agreement with the calculated equilibrium temperature, the estimated accuracy of the spectroscopic temperature being ± 75°K. A relaxation time of about 25 µsec was observed for the (2,2) and (3,3) vibration bands to reach statistical equilibrium with the lower (0,0) and (1,1) vibrational levels in the ^2∑ state from which the emission occurred.

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Additional Information:© 1963 Pergamon Press Ltd. Received 7 February 1963. Available online 17 August 2002. Supported by the Air Force Office of Scientific Research under Grant No. AFOSR-7163 with the California Institute of Technology. The author is indebted to Prof. S. S. Penner for his helpful advice and discussions during the course of this work.
Group:Guggenheim Jet Propulsion Center
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Air Force Office of Scientific Research (AFOSR)AFOSR-7163
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Guggenheim Jet Propulsion CenterUNSPECIFIED
Issue or Number:3
Record Number:CaltechAUTHORS:20110104-104430745
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Official Citation:Experimental spectroscopic temperature measurements in the reflected wave region of a shock tube using the OH 2Σ → 2П band system Original Research Article Pages 255-264 Ronald Watson
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:21572
Deposited By: Ruth Sustaita
Deposited On:07 Jan 2011 18:05
Last Modified:09 Nov 2021 15:58

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