Optodynamic characterization of a laser cleaning process

2001 ◽  
Author(s):  
Vladimir B. Bregar ◽  
Janez I. Mozina
Keyword(s):  
Laser Cleaning ◽  
Cleaning Process

Characterization of laser cleaning of limestone

1995 ◽  
Vol 27 (1) ◽  
pp. 69-73 ◽  
Author(s):  
M.I. Cooper ◽  
D.C. Emmony ◽  
J. Larson
Keyword(s):  
Laser Cleaning

scholarly journals Evaluation of Cleaning Processes Using Colorimetric and Spectral Data for the Removal of Layers of Limewash from Medieval Plasterwork

Sensors ◽  
2020 ◽  
Vol 20 (24) ◽  
pp. 7147
Author(s):  
Miguel Ángel Martínez-Domingo ◽  
Ana Isabel Calero Castillo ◽  
Eva Vivar García ◽  
Eva M. Valero
Keyword(s):  
Cultural Heritage ◽  
Hyperspectral Imaging ◽  
Color Difference ◽  
Cleaning Process ◽  
Heritage Preservation ◽  
The Mean ◽  
Cultural Heritage Preservation ◽  
Conservation Interventions

In the cultural heritage preservation of medieval buildings, it is common to find plaster walls covered in lime, which previously were painted in polychromy. The conservation interventions usually try to remove the whitewash, whilst maintaining the original color of the painted wall as much as possible. However, there is no agreement on which cleaning technique best preserves the original appearance of the colored plaster. Different pigments found below the lime layer may behave differently depending on the cleaning technique used. Usually, colorimetric or photometric area-based measurements are carried out to study the color of the cleaned areas to compare with their original color, obtained from pre-made plaster probes. However, this methodology fails when the mean color difference is not enough to fully characterize the changes in texture and color appearance. This study presents a set of experiments carried out using two different pigments (cinnabar and malachite) covered with lime, and treated with nine different cleaning techniques on plaster probes prepared according to medieval techniques. We have studied the effect of the cleaning process on the color and the homogeneity of the samples using a hyperspectral imaging workflow. Four different analysis methods are presented and discussed. Our results show that the proposed analysis is able to provide a much more comprehensive and diversified characterization of the quality of the cleaning method compared to the commonly used colorimetric or photometric area-based measurements.

scholarly journals Microscopic analysis and microstructural characterization of the organic and inorganic components of dairy fouling during the cleaning process

2020 ◽  
Vol 103 (3) ◽  
pp. 2117-2127
Author(s):  
Alfons Eduard Guerrero-Navarro ◽  
Abel Guillermo Ríos-Castillo ◽  
Carolina Ripolles-Avila ◽  
Xavier Felipe ◽  
José Juan Rodríguez-Jerez
Keyword(s):  
Microscopic Analysis ◽  
Microstructural Characterization ◽  
Cleaning Process ◽  
Inorganic Components

Effect of laser cleaning process parameters on the surface roughness of 5754-grade aluminum alloy

2019 ◽  
Vol 105 (5-6) ◽  
pp. 2481-2490 ◽  
Author(s):  
Guangxing Zhang ◽  
Xueming Hua ◽  
Fang Li ◽  
Yuelong Zhang ◽  
Chen Shen ◽  
...  
Keyword(s):  
Surface Roughness ◽  
Aluminum Alloy ◽  
Process Parameters ◽  
Laser Cleaning ◽  
Cleaning Process

Optical characterization of pigments by reflectance spectroscopy in support of UV laser cleaning treatments

2008 ◽  
Vol 92 (1) ◽  
pp. 223-227 ◽  
Author(s):  
S. Acquaviva ◽  
E. D’Anna ◽  
M.L. De Giorgi ◽  
A. Della Patria ◽  
L. Pezzati
Keyword(s):  
Optical Characterization ◽  
Reflectance Spectroscopy ◽  
Laser Cleaning ◽  
Uv Laser

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.

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