Plasma Plume Oscillations Monitoring during Laser Welding of Stainless Steel by Discrete Wavelet Transform Application

doi:10.3390/s100403549

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Sensors 2010, 10(4), 3549-3561; doi:10.3390/s100403549

Article

Plasma Plume Oscillations Monitoring during Laser Welding of Stainless Steel by Discrete Wavelet Transform Application

Teresa Sibillano ¹^,* , Antonio Ancona ¹ , Domenico Rizzi ¹ , Valentina Lupo ³, Luigi Tricarico ^1,3 and Pietro Mario Lugarà ^1,2

¹ CNR-INFM Regional Laboratory “LIT3”, via Amendola 173, I-70126 Bari, Italy ² Dipartimento Interateneo di Fisica “M. Merlin”, Università and Politecnico of Bari, via Amendola 173, I-70126 Bari, Italy ³ Dipartimento di Ing. Meccanica e Gestionale, Politecnico di Bari, I-70126 Bari, Italy

* Author to whom correspondence should be addressed.

Received: 13 January 2010; in revised form: 27 January 2010 / Accepted: 12 March 2010 / Published: 8 April 2010

(This article belongs to the Section Physical Sensors)

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Abstract: The plasma optical radiation emitted during CO₂ laser welding of stainless steel samples has been detected with a Si-PIN photodiode and analyzed under different process conditions. The discrete wavelet transform (DWT) has been used to decompose the optical signal into various discrete series of sequences over different frequency bands. The results show that changes of the process settings may yield different signal features in the range of frequencies between 200 Hz and 30 kHz. Potential applications of this method to monitor in real time the laser welding processes are also discussed.

Keywords: optical sensor; laser welding; plasma spectroscopy

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MDPI and ACS Style

Sibillano, T.; Ancona, A.; Rizzi, D.; Lupo, V.; Tricarico, L.; Lugarà, P.M. Plasma Plume Oscillations Monitoring during Laser Welding of Stainless Steel by Discrete Wavelet Transform Application. Sensors 2010, 10, 3549-3561.

AMA Style

Sibillano T., Ancona A., Rizzi D., Lupo V., Tricarico L., Lugarà P.M. Plasma Plume Oscillations Monitoring during Laser Welding of Stainless Steel by Discrete Wavelet Transform Application. Sensors. 2010; 10(4):3549-3561.

Chicago/Turabian Style

Sibillano, Teresa; Ancona, Antonio; Rizzi, Domenico; Lupo, Valentina; Tricarico, Luigi; Lugarà, Pietro Mario. 2010. "Plasma Plume Oscillations Monitoring during Laser Welding of Stainless Steel by Discrete Wavelet Transform Application." Sensors 10, no. 4: 3549-3561.

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