Authors: Lucas, Owen¹; Alwahabi, Zeyad T.²; Linton, Valerie¹; Meeuwissen, Karel¹

Source: Applied Spectroscopy, Volume 61, Issue 5, Pages 94A-102A and 459-569 (May 2007) , pp. 565-569(5)

Publisher: Society for Applied Spectroscopy

Abstract:

The application of polarization spectroscopy (PS) to detect atomic species in an atmospheric pressure welding plasma has been demonstrated. PS spectra of Na atoms, seeded in the shielding gas flow of a gas tungsten arc welding (GTAW) plasma, are presented at different pump beam energies. The nature of the PS technique was found to be very efficient in suppressing the high background emission associated with the welding plasma. The PS spectral profiles appear to be Lorentzian and Lorentzian cubed for high and low pump beam energy, respectively. The effect of beam steering, due to the thermal gradient in the interaction plasma zone, was addressed. It was found that there is 2% unavoidable error in the detectable PS signal.

Keywords: POLARIZATION SPECTROSCOPY; PS; LASER DIAGNOSTICS; ARC; PLASMA

Document Type: Research article

DOI: http://dx.doi.org/10.1366/000370207780807740

Affiliations: 1: School of Mechanical Engineering, University of Adelaide, Adelaide, SA 5005, Australia 2: School of Chemical Engineering, University of Adelaide, Adelaide, SA 5005, Australia

Publication date: 2007-05-01

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