Journal
SENSORS
Volume 10, Issue 4, Pages 3549-3561Publisher
MOLECULAR DIVERSITY PRESERVATION INTERNATIONAL-MDPI
DOI: 10.3390/s100403549
Keywords
optical sensor; laser welding; plasma spectroscopy
Funding
- European Community [FP7-SME-2007-1-222279]
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The plasma optical radiation emitted during CO(2) 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.
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