Effect of longitudinal laser mode beating in damage probability measurements

2013 ◽  
Author(s):  
Gintarė Batavičiūtė ◽  
Egidijus Pupka ◽  
Viktorija Pyragaitė ◽  
Linas Smalakys ◽  
Andrius Melninkaitis
Keyword(s):  
Laser Mode ◽  
Damage Probability ◽  
Mode Beating

Laser-mode beating used for detector frequency-response measurements

1977 ◽  
Vol 16 (10) ◽  
pp. 2703 ◽  
Author(s):  
R. A. Lawton ◽  
M. Young
Keyword(s):  
Frequency Response ◽  
Laser Mode ◽  
Mode Beating

scholarly journals Vulnerability Assessment of Buildings due to Land Subsidence Using InSAR Data in the Ancient Historical City of Pistoia (Italy)

Sensors ◽  
2020 ◽  
Vol 20 (10) ◽  
pp. 2749 ◽  
Author(s):  
Pablo Ezquerro ◽  
Matteo Del Soldato ◽  
Lorenzo Solari ◽  
Roberto Tomás ◽  
Federico Raspini ◽  
...  
Keyword(s):  
Fragility Curves ◽  
Central Italy ◽  
Sar Interferometry ◽  
Ground Subsidence ◽  
Public And Private ◽  
Radar Images ◽  
Spatial Deformation ◽  
Damage Probability ◽  
Medium Resolution ◽  
Vertical Displacements

The launch of the medium resolution Synthetic Aperture Radar (SAR) Sentinel-1 constellation in 2014 has allowed public and private organizations to introduce SAR interferometry (InSAR) products as a valuable option in their monitoring systems. The massive stacks of displacement data resulting from the processing of large C-B and radar images can be used to highlight temporal and spatial deformation anomalies, and their detailed analysis and postprocessing to generate operative products for final users. In this work, the wide-area mapping capability of Sentinel-1 was used in synergy with the COSMO-SkyMed high resolution SAR data to characterize ground subsidence affecting the urban fabric of the city of Pistoia (Tuscany Region, central Italy). Line of sight velocities were decomposed on vertical and E–W components, observing slight horizontal movements towards the center of the subsidence area. Vertical displacements and damage field surveys allowed for the calculation of the probability of damage depending on the displacement velocity by means of fragility curves. Finally, these data were translated to damage probability and potential loss maps. These products are useful for urban planning and geohazard management, focusing on the identification of the most hazardous areas on which to concentrate efforts and resources.

Laser mode manipulation by intracavity dynamic holography: Application to mode selection

1999 ◽  
Vol 69 (2) ◽  
pp. 155-157 ◽  
Author(s):  
N. Huot ◽  
J.M. Jonathan ◽  
G. Pauliat ◽  
P. Georges ◽  
A. Brun ◽  
...  
Keyword(s):  
Mode Selection ◽  
Laser Mode ◽  
Dynamic Holography

scholarly journals Experiment and numerical modeling of asymmetrically initiated hexagonal prism warhead

2017 ◽  
Vol 9 (1) ◽  
pp. 168781401668796 ◽  
Author(s):  
Yuan Li ◽  
Yuquan Wen
Keyword(s):  
Numerical Modeling ◽  
The Other ◽  
Energy Utilization ◽  
Hexagonal Prism ◽  
Cylindrical Structure ◽  
Damage Probability ◽  
Other Hand ◽  
Density Enhancement ◽  
Fragment Distribution ◽  
Velocity Enhancement

Traditional fragmentation warheads are usually initiated on the axis, producing a uniform fragment distribution around the warhead, but only little portion of them can be imposed on the targets. The aimable warhead, on the other hand, using the off-axis initiations or the structure deforming, can improve the warhead energy utilization highly. Seeking methods to both enhance the fragment velocity and density has significant value for improving the target damage probability. In this article, a warhead shaped as hexagonal prism was studied using arena experiment and numerical modeling and compared with the traditional cylindrical structure. The fragment velocities and target hit patterns of the two types of warheads under axial initiation and asymmetrical initiation are obtained. It is revealed that for the hexagonal prism warhead, the asymmetrical initiation can enhance the fragment velocities by 27.71% and enhance fragment density by 34.09% compared to the axial initiation. The fragment velocity enhancement is close to that of the cylindrical warhead, but the fragment density enhancement is far above the cylindrical warhead. This indicates that the asymmetrically initiated hexagonal prism warhead is a very effective aimable warhead.

Using the E22 transition of carbon nanotubes for fiber laser mode-locking

2010 ◽  
Vol 8 (2) ◽  
pp. 144-149 ◽  
Author(s):  
J.C. Travers ◽  
J. Morgenweg ◽  
E.D. Obraztsova ◽  
A.I. Chernov ◽  
E.J.R. Kelleher ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Fiber Laser ◽  
Mode Locking ◽  
Laser Mode

scholarly journals Versatile multi-wavelength ultrafast fiber laser mode-locked by carbon nanotubes

2013 ◽  
Vol 3 (1) ◽  
Author(s):  
Xueming Liu ◽  
Dongdong Han ◽  
Zhipei Sun ◽  
Chao Zeng ◽  
Hua Lu ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Fiber Laser ◽  
Laser Mode ◽  
Multi Wavelength
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