A Two-Line Absorption Instrument for Scramjet Temperature and Water Vapor Concentration Measurement in Hypulse

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A three beam water vapor sensor system has been modified to provide for near simultaneous temperature measurement. The system employs a tunable diode laser to scan spectral line of water vapor. The application to measurements in a scramjet combustor environment of a shock tunnel facility is discussed. This report presents and discusses die initial calibration of the measurement system. Tsai, C. Y.