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• Sibillano, T
• Ancona, A
• Berardi, V
• Lugarà, P
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• Sibillano, T
• Ancona, A
• Berardi, V
• Lugarà, P
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• Sibillano, T
• Ancona, A
• Berardi, V
• Lugarà, P

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Sensors 2009, 9(5), 3376-3385; doi:10.3390/s90503376

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A Real-Time Spectroscopic Sensor for Monitoring Laser Welding Processes

Teresa Sibillano ^1,* , Antonio Ancona ¹ , Vincenzo Berardi ²  and Pietro Mario Lugarà ^{1, 2}

¹ CNR-INFM Regional Laboratory LIT3, via Amendola 173, Bari, Italy ² Dipartimento Interateneo di Fisica, Università e Politecnico di Bari, Via E. Orabona 4, I-70126 Bari, Italy

* Author to whom correspondence should be addressed.

Received: 4 March 2009; in revised form: 28 April 2009 / Accepted: 29 April 2009 / Published: 7 May 2009

(This article belongs to the Special Issue State-of-the-Art Sensors Technology in Italy)

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Abstract: In this paper we report on the development of a sensor for real time monitoring of laser welding processes based on spectroscopic techniques. The system is based on the acquisition of the optical spectra emitted from the laser generated plasma plume and their use to implement an on-line algorithm for both the calculation of the plasma electron temperature and the analysis of the correlations between selected spectral lines. The sensor has been patented and it is currently available on the market.

Keywords: Optical sensor; laser welding; plasma spectroscopy

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