Temperature measurement in a high pressure dielectric barrier discharge using pressure induced line broadening and frequency shift

We have demonstrated two gas temperature measurement methods which are applicable to high pressure discharges where the pressure induced line broadening and frequency shift dominate over thermal broadening of atomic transitions. We have used diode-laser absorption spectroscopic measurements of argon 1s3→2p2 transition Doppler linewidth, Lorentzian broadening, and frequency shift to measure gas temperature in a dielectric barrier discharge operating from 5 up to 500Torr with temperature rise less than 100K.