scholarly journals Effects of the Wavenumber Spectrum of a Sea Surface on Laser Beam Reflection

1979 ◽  
Vol 32 (5) ◽  
pp. 469 ◽  
Author(s):  
DM Phillips
Keyword(s):  
Laser Beam ◽  
Water Surface ◽  
Pulsed Laser ◽  
Sea Surface ◽  
Beam Diameter ◽  
The Mean ◽  
Wavenumber Spectrum ◽  
Beam Reflection ◽  
Depth Sounding ◽  
Pulsed Laser Beam

The angular and temporal distributions of energy in the reflection of a pulsed laser beam from a sea surface depend on the diameter of the beam and on the wavenumber spectrum of the water surface. Theoretical expressions are derived for the influence on the reflection of the mean height and slope of waves in the illuminated area as well as the variation of the height and slope within this area. The results are applied to airborne lasers for wave height profiling, altimetry and water depth sounding. The optimum beam diameter depends on both the application and the wavenumber pectrum of the water surface.

Quasi-one-dimensional thermal deformation and displacement of the surface of a solid in a pulsed laser beam

1997 ◽  
Vol 39 (12) ◽  
pp. 1985-1988
Author(s):  
S. V. Vintsents ◽  
S. G. Dmitriev ◽  
K. I. Spiridonov
Keyword(s):  
Laser Beam ◽  
Thermal Deformation ◽  
Pulsed Laser ◽  
One Dimensional ◽  
Pulsed Laser Beam

High precision balanced mode polarimetry with a pulsed laser beam

1995 ◽  
Vol 119 (3-4) ◽  
pp. 403-414 ◽  
Author(s):  
M. Bouchiat ◽  
D. Chauvat ◽  
J. Guéna ◽  
Ph. Jacquier ◽  
M. Lintz ◽  
...  
Keyword(s):  
Laser Beam ◽  
High Precision ◽  
Pulsed Laser ◽  
Pulsed Laser Beam

Comparative Study on Pulsed Laser Welding Strategies for Contacting Lithium-Ion Batteries

2016 ◽  
Vol 1140 ◽  
pp. 312-319 ◽  
Author(s):  
Patrick Schmitz
Keyword(s):  
Laser Beam ◽  
Comparative Study ◽  
Weld Seam ◽  
Laser Beam Welding ◽  
Pulsed Laser ◽  
Pulsed Laser Beam Welding ◽  
Joining Process ◽  
Suitable Process ◽  
Pulsed Laser Beam ◽  
Battery Cells

The transition towards renewable energy implicates more decentralized and time-dependent ways of energy generation. In order to deal with the resulting fluctuation in energy supply, local storage systems are necessary. Larger systems may consist of thousands of battery cells. Therefore, the reliable interconnection between the individual battery cells is the basic prerequisite for the production of these systems. It has been demonstrated that laser beam welding is a suitable process for the contacting of batteries. However, due to the high requirements regarding the heat input and the reproducibility of the joining process, further investigations are necessary. Within this work, experiments on pulsed laser beam welding of nickel-plated DC04 steel were conducted. Four different pulsed welding strategies were analyzed in a preliminary study in order to develop a method for obtaining suitable process parameters while reducing the amount of free parameters. Subsequently, a comparative study between the rectangular pulse, the shaped pulse, the spike pulse and the sloping pulse was carried out. The weld seam properties as well as the electrical and the mechanical properties of the connection joints were evaluated. The results presented in this paper indicate a high eligibility of pulsed laser beam welding as a joining process for the connection of battery cells. For all analyzed pulsed welding strategies a homogeneous weld seam without full penetration was observed. Similar electrical resistances for all strategies were measured despite the comparatively small total joint area for the discretely pulsed weld seams.

Detector Array for Measuring Temporal-Spatial Distribution of High-Repetition-Rate Pulsed Laser Beam Profile

2013 ◽  
Vol 40 (6) ◽  
pp. 0608003
Author(s):  
冯国斌 Feng Guobin ◽  
王振宝 Wang Zhenbao ◽  
冯刚 Feng Gang ◽  
杨鹏翎 Yang Pengling ◽  
王群书 Wang Qunshu ◽  
...  
Keyword(s):  
Spatial Distribution ◽  
Laser Beam ◽  
Repetition Rate ◽  
Pulsed Laser ◽  
High Repetition Rate ◽  
Beam Profile ◽  
Detector Array ◽  
Laser Beam Profile ◽  
High Repetition ◽  
Pulsed Laser Beam

Simulation and verification of pulsed laser beam propagation underwater using Markov chains [Invited]

2019 ◽  
Vol 17 (10) ◽  
pp. 100003
Author(s):  
Tianhua Zhou ◽  
Jian Ma ◽  
Tingting Lu ◽  
Guyu Hu ◽  
Tingwei Fan ◽  
...  
Keyword(s):  
Markov Chains ◽  
Laser Beam ◽  
Pulsed Laser ◽  
Beam Propagation ◽  
Laser Beam Propagation ◽  
Pulsed Laser Beam
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