Investigation of acoustic monitoring in the laser cleaning of copper

1997 ◽  
Author(s):  
J. M. Lee ◽  
K. G. Watkins ◽  
A. Kearns ◽  
W. M. Steen ◽  
J. D. Ryan ◽  
...  
Keyword(s):  
Acoustic Monitoring ◽  
Laser Cleaning

Characterization of Laser Cleaning of Copper for Soldering Processes

2000 ◽  
Vol 123 (3) ◽  
pp. 521-527 ◽  
Author(s):  
J. M. Lee ◽  
K. G. Watkins ◽  
W. M. Steen
Keyword(s):  
Laser Pulse ◽  
Printed Circuit Boards ◽  
Acoustic Monitoring ◽  
Mechanical Effect ◽  
Laser Cleaning ◽  
Process Window ◽  
Circuit Boards ◽  
Copper Surfaces ◽  
532 Nm

The laser cleaning of copper surfaces with a Nd:YAG Q-switched laser pulse for the improvement of solder quality on printed circuit boards (PCBs) has been monitored and characterized by sensing the acoustic emission during the process and one-dimensional mathematical model analysis. It was found that selective removal of copper oxides from the surface was achieved by the laser operation, which was described theoretically by the model and was confirmed experimentally by the acoustic monitoring. The acoustic monitoring provided not only threshold laser fluence and optimal process window for the cleaning of copper but also the clear possibility for real-time surface monitoring of the process. Different features at the two laser wavelengths used (1064 nm and 532 nm) were observed in the surface morphology, i.e., the laser pulse with 532 nm wavelength produced a lightly sputtered wide area around the laser crater. From the theoretical and experimental investigation of laser cleaning mechanisms at different wavelengths, it was found that the mechanical effect induced by the intense shock waves was much more dominant at 532 nm wavelength than at 1064 nm.

Acoustic monitoring for the laser cleaning of sandstone

2003 ◽  
Vol 4 ◽  
pp. 65-71 ◽  
Author(s):  
Marta Jankowska ◽  
Gerard Śliwiński
Keyword(s):  
Acoustic Monitoring ◽  
Laser Cleaning

Optimisation and on-line acoustic monitoring of laser cleaning of soiled paper

2005 ◽  
Vol 81 (5) ◽  
pp. 943-951 ◽  
Author(s):  
M. Strlič ◽  
V.S. Šelih ◽  
J. Kolar ◽  
D. Kočar ◽  
B. Pihlar ◽  
...  
Keyword(s):  
Acoustic Monitoring ◽  
Laser Cleaning ◽  
On Line

On Path Generation Method for Laser Cleaning Robot Based on Line Structured Light

2020 ◽  
Author(s):  
Qingzeng Ma ◽  
Dongbin Zhang ◽  
Shuo Jin ◽  
Yuan Ren ◽  
Wei Cheng ◽  
...  
Keyword(s):  
Structured Light ◽  
Laser Cleaning ◽  
Path Generation ◽  
Cleaning Robot ◽  
On Line
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