APPLICATION OF THE (O,O) SWAN BAND SPECTRUM FOR TEMPERATURE-MEASUREMENTS

Emission spectra of the 516.611 nm Swan band of the Cp molecule were e mployed for evaluation of the rotational temperature in different plas ma sources. This diagnostic method may be applied in the temperature r ange from 300-6000 K and is especially useful for noisy and spectrally not well-resolved spectra when the apparatus function of a recording system is unknown. The described method is based on a comparison of ex perimental data with the theoretically calculated spectrum. The numeri cal minimization procedure is started with the temperature value obtai ned from the Boltzmann plot or the intensity ratio of two selected spe ctrum components. An analysis of a theoretically calculated spectrum i s presented. Two plasma sources were examined, a plasma torch recombin ing jet and high-voltage-triggered dielectric barrier discharge (DBD).