Abstract
A collinear long-short dual-pulse laser-induced breakdown spectroscopy (DP-LIBS) method was employed to enhance and stabilize the laser-induced plasma from steel sample. The long-pulse-width laser beam with the pulse width of 60 μs was generated by a Nd: YAG laser which was operated at FR (free running) mode. The comparative experiments were carried out between single pulse LIBS (SP-LIBS) and long-short DP-LIBS. The recorded results showed that the emission intensities and the temperature of plasma were enhanced by long-short DP-LIBS. The plasma images showed that the plasma was bigger and had a longer lifetime in long-short DP-LIBS situation. Through the calculation of time-resolved plasma temperature and intensity ratio, it can be concluded that the plasma was stabilized by the long-pulse-width laser beam. The long-short DP-LIBS method also generated the stable plasma condition from the samples with different initial temperatures, which overcame the difficulties of LIBS in the online measurement for steel production line.
| Original language | English |
|---|---|
| Pages (from-to) | 14-22 |
| Number of pages | 9 |
| Journal | Spectrochimica Acta - Part B Atomic Spectroscopy |
| Volume | 142 |
| DOIs | |
| State | Published - Apr 2018 |
| Externally published | Yes |
Keywords
- Collinear long-short DP-LIBS
- Long-pulse-width laser
- Signal enhancement
- Stabilized plasma
- Steel sample