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    Subsonic In-Flight Temperature and Pressure Measurements Using a Scramjet Inlet Flow Sensor

    Subsonic In-Flight Temperature and Pressure Measurements Using a Scramjet Inlet Flow Sensor


    The performance of a scramjet inlet sensor based on tunable diode laser absorption spectroscopy of oxygen in the A-band near 760 nm during a low-altitude, subsonic flight test is discussed. Though the scramjet did not reach the targeted hypersonic flight regime due to the malfunction of the first-stage booster, analysis of the spectral absorption data acquired during the descent flight below 3 km successfully determined pressure and temperature in the inlet and demonstrated that the system was capable of producing an adequate signal-to-noise ratio to allow temperature, pressure, and velocity measurements under the expected hypersonic flight conditions at altitudes up to at least 30 km. This is the first flight-tested tunable diode laser sensor for a scramjet inlet flow, and the robustness and stability of the sensor design in dynamic load conditions were made evident by the quality of the data recorded after a very unstable and high- g launch scenario.

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    Title :

    Subsonic In-Flight Temperature and Pressure Measurements Using a Scramjet Inlet Flow Sensor

    Contributors:
    Kurtz, Joe (author) / Aizengendler, Mark (author) / Krishna, Yedhu (author) / Walsh, Paul (author) / Brown, Melrose (author) / O’Byrne, Sean (author)
    Published in:

    AIAA Journal ; 54 , 3 ; 1011-1017

    Publication date :

    2015-12-23

    Size :

    7 pages

    ISSN :

    0001-1452 , 1533-385X

    DOI :

    https://doi.org/10.2514/1.J054207

    Type of media :

    Article (Journal)

    Type of material :

    Electronic Resource

    Language :

    English

    Keywords :

    Scramjet , Sensor Systems , Flight Testing , Hypersonic Flows , Diode Lasers , Hypersonic Flight , Absorption Spectroscopy , Riemann Solver , Doppler Broadening , Flight Data

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