Abstract
There is an increasing interest in developing hypersonic vehicles and this paper presents progress towards the initial development of a flight-ready optical emission spectroscopy (OES) sensor to use for vehicle control. This sensor is designed to probe external flow over hypersonic vehicles from Mach 8 to 20. The OES response was experimentally investigated using a Tesla coil discharge and shock tube to examine the N_2 (C(^3)Π_u -B(^3)Π_g ) second positive system and NO (A(^2)Σ-X(^2)Π) γ system. Data was collected using a Czerny-Turner spectrometer with a CCD. Both free-space and fiber coupling of optical emission into the spectrometer were tested. Furthermore, the relation of these results to an OES sensor design using a multi-anode photomultiplier tube array are discussed and the possibility of two spectrometers for sensing vibrational and rotational temperature respectively is considered.
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