Spectral radiation measurements were made in the range of 200 to
900 nm across a section of the plenum of an arc jet wind tunnel
using a series of optical fibers. The spectra contained line
radiation from Oxygen and Nitrogen atoms and molecular radiation
from N2(+), N2, and NO. Abel inversion technique is used to obtain
radial distribution of the spectra. The analysis yielded radial
profiles of the electronic excitation, vibrational and rotational
temperatures of the flow field. Spectral fitting yielded branching
ratios for different vibrational and rotational bands. Relatively
mild flow conditions, i.e. enthalpy and mass flow rate, were used
for prolonged measurements of up to and over two hours to establish
the best experimental methods of temperature determinations. Signal
to noise was improved by at least an order of magnitude enabling
the molecular vibrational band heads of N2(+) (first negative
system), N2 (second positive system), and NO (beta, gamma, delta,
and epsilon systems) to be resolved in the lower ultraviolet
wavelength regions. The increased signal to noise ratio also
enabled partial resolution of the rotational lines of N2(+) and N2
in certain regions of minimal overlap. Comparison of the spectra
with theoretical models such as the NEQAIR2 code are presented and
show potential for fitting the spectra when reliable calibration is
performed for the complete wavelength range.
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