Determination of laser beam weldment properties by grating interferometry method

1996 ◽  
Author(s):  
Malgorzata Kujawinska ◽  
Leszek A. Salbut
Keyword(s):  
Laser Beam ◽  
Interferometry Method

A-Si:H Ambipolar Diffusion Length and Effective Lifetime Measured by Flying Spot Technique (FST)

1991 ◽  
Vol 219 ◽  
Author(s):  
M. Vieira ◽  
R. Martins ◽  
E. Fortunato ◽  
F. Soares ◽  
L. Guimaraes
Keyword(s):  
Laser Beam ◽  
Transient Analysis ◽  
Diffusion Length ◽  
Transport Equations ◽  
Ambipolar Diffusion ◽  
Schottky Barriers ◽  
Effective Lifetime ◽  
Asymmetrical Distribution ◽  
Flying Spot

ABSTRACTThe determination of the ambipolar diffusion length, L*, and the effective lifetime, τ*, in p/i and a-Si:H Schottky barriers (ITO/p/a-Si:H/Al-Si; Cr/a-Si:H/Cr/Ag) have been determined by Flying Spot Technique, FST. This technique consists in the transient analysis of the photocurrent/photopotential induced by a laser beam that moves perpendicularly to the structure with a constant motion ratio, at different velocities. Taking into account the competition between the diffusion/drift velocities of the excess carriers and the velocity of the flying spot, it is possible to solve the transport equations and to compute separately L* and τ*, from the asymmetrical distribution responses.

In-process determination of laser beam absorption coefficient for laser-assisted turning processes

2017 ◽  
Vol 92 (5-8) ◽  
pp. 2929-2938 ◽  
Author(s):  
Mostafa M. Kashani ◽  
Mohammad R. Movahhedy ◽  
Mohammad T. Ahmadian ◽  
Reza S. Razavi
Keyword(s):  
Absorption Coefficient ◽  
Laser Beam ◽  
Laser Assisted Turning

Determination of the adaptive mirror’s parameters for the phase correction of laser beam passed through an airway

2021 ◽  
Author(s):  
Vyacheslav Blagonravov ◽  
Andrey Vereshchagin ◽  
Mikhail Glukhov ◽  
Daniil Guk ◽  
Mikhail Koltygin ◽  
...  
Keyword(s):  
Laser Beam ◽  
Phase Correction

scholarly journals In situ determination of the critical straining condition for solidification cracking during laser beam welding

Procedia CIRP ◽  
2020 ◽  
Vol 94 ◽  
pp. 666-670
Author(s):  
Nasim Bakir ◽  
Andrey Gumenyuk ◽  
Vitaly Pavlov ◽  
Sergey Volvenko ◽  
Michael Rethmeier
Keyword(s):  
Laser Beam ◽  
Laser Beam Welding ◽  
Solidification Cracking

The Influence of Laser Beam Technological Parameters on the Polymethyl Methacrylate Surface Quality

2018 ◽  
Vol 919 ◽  
pp. 190-198 ◽  
Author(s):  
Vladimír Pata ◽  
Libuše Sýkorová ◽  
Oldřich Šuba ◽  
Milena Kubišová
Keyword(s):  
Regression Analysis ◽  
Statistical Analysis ◽  
Laser Beam ◽  
Surface Quality ◽  
Polymethyl Methacrylate ◽  
Quality Parameters ◽  
Technological Parameters ◽  
Detailed Statistical Analysis ◽  
Mathematical Relations

The paper is focused on the determination of the course and change of the surface quality parameters obtained by the laser engraving of the material known under commercial name polymethyl methacrylate. The paper aims to find mathematical relations based on regression analysis for amplitudes parameters Ra and Rz. For this purpose, a sample of variable technology parameters will be machined followed by the surface measuring and evaluation using the Talysurf CLI 500 3D Surface Scanner. Thus the data obtained will be subjected to the detailed statistical analysis to check homoscedasticity, the presence of outliers, and multidimensional normality testing.

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