An atmospheric plasma jet was generated by ionizing nitrogen ejected from a torch loaded with high voltage. The acquisition of transmission spectra by terahertz time-domain spectroscopy was carried out at three locations at different distances from the plasma torch nozzle. Combined with the theoretical model of terahertz pulse propagation in uniform plasma medium, the average density of plasma was calculated from the phase shift and spectral amplitude ratio measured experimentally. By comparing the measurement results of plasma density with those of Langmuir double-probe for these three different positions, the feasibility of measuring average density of atmospheric plasma with terahertz time-domain spectroscopy was corroborated.
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