CO2 Laser Induced Breakdown and Heating of Hydrogen in a Magnetic Mirror Field Geometry

1975 ◽  
Vol 53 (14) ◽  
pp. 1360-1366 ◽  
Author(s):  
A. A. Offenberger ◽  
N. H. Burnett
Keyword(s):  
Laser Pulse ◽  
High Speed ◽  
Ruby Laser ◽  
Thomson Scattering ◽  
Magnetic Mirror ◽  
High Speed Photography ◽  
Parabolic Mirror ◽  
Laser Induced Breakdown ◽  
Field Geometry ◽  
Breakdown Plasma

A 1 GW, 125 J CO2 laser pulse focussed by a 10 cm f.l. parabolic mirror has been used to induce breakdown and heating in 15 Torr hydrogen along the axis of a short 50 kG magnetic mirror field. Evolution of the breakdown plasma thus produced has been studied by high speed photography, ruby laser Thomson scattering, and a Mach–Zehnder interferometer. Results indicate an efficient radial confinement of plasma by the mirror field with an electron temperature much enhanced over that resulting from a fieldfree breakdown. Interferometric measurements show that breakdown results in a cylindrical plasma with an electron density minimum on axis in both cases. A monitor of the transmitted CO2 laser pulse indicates very incomplete coupling of laser radiation into the plasma column with the field applied, presumably due to refraction losses at the entrance boundary of the breakdown.

Multiple Ruby Laser System For High Speed Photography

1982 ◽  
Vol 21 (4) ◽  
Author(s):  
James W. Dally ◽  
Robert J. Sanford
Keyword(s):  
High Speed ◽  
Ruby Laser ◽  
Laser System ◽  
High Speed Photography

DETERMINATION SOUND SPEED OF METAL IN AQUEOUS SOLUTION VIA LASER INDUCED ACOUSTIC WAVE TECHNIQUE

2016 ◽  
Vol 78 (3) ◽  
Author(s):  
Maisarah Duralim ◽  
Noriah Bidin ◽  
Waskito Nugroho ◽  
Jasman Zainal
Keyword(s):  
Shock Wave ◽  
Aqueous Solution ◽  
Acoustic Wave ◽  
Sound Speed ◽  
High Speed ◽  
Optical Breakdown ◽  
High Speed Photography ◽  
Nonlinear Phenomena ◽  
Metal Element ◽  
Laser Induced Breakdown

Laser induced breakdown and shock wave propagation are nonlinear phenomena. The high temperature and high pressure associated with plasma formation offering a lot advantages in industrial and scientific research.  However not many realized that the end  product of nonlinear effect such as the generation of acoustic wave will also attribute to significant impact. Thus the intention of this study is to materialize the usefulness of such acoustic wave for determination the sound speed of metal element like Pb, Hg and K in aqueous solution. In this attempt a Q-switched Nd:YAG laser was focused to induce optical breakdown and its associated shock wave generation which later  follow by the generation of acoustic wave. The phenomenon is observed in conjunction with high speed photography based shadowgraph technique. The experimental results of sound speed for K, Hg and Pb is found in good agreement with the standard value from references. This confirmed that laser induced acoustic wave will be other alternative method for measuring sound speed for metal element in periodic table.

scholarly journals Application of a ruby laser to high-speed photography

1963 ◽  
Vol 51 (6) ◽  
pp. 942-943 ◽  
Author(s):  
A.T. Ellis ◽  
M.E. Fourney
Keyword(s):  
High Speed ◽  
Ruby Laser ◽  
High Speed Photography

Studies on Influence of Liquid Film Wave on Atomization and Wave Measurement

1989 ◽  
Author(s):  
Gan Xiaohua ◽  
Zhao Qishou
Keyword(s):  
Laser Pulse ◽  
Liquid Film ◽  
Size Distribution ◽  
High Speed ◽  
High Speed Photography ◽  
Phase Interaction ◽  
Spray Characteristics ◽  
Two Phase ◽  
Wave Measurement ◽  
Particle Sizer

In the present paper, two-phase interaction inside pre filming airblast atomizer and its influence on atomization are studied. Liquid film wave inside the atomizer is measured with techniques called resistance method and optics method, which are also developed herein. By the means of laser pulse micrography, high speed photography and laser particle sizer, disintegration and fluctuation of liquid wave are picturized and spray size SMD and size distribution parameter N are measured. Experiments show that liquid wave inside atomizer has important influence on spray characteristics.

Crack divergence phenomena in tempered glass

2020 ◽  
Vol 13 (3) ◽  
pp. 115-129
Author(s):  
Shin’ichi Aratani
Keyword(s):  
Optimal Design ◽  
High Speed ◽  
Glass Plate ◽  
Acute Angle ◽  
Divergence Angle ◽  
High Speed Photography ◽  
Tempered Glass ◽  
Thick Glass

High speed photography using the Cranz-Schardin camera was performed to study the crack divergence and divergence angle in thermally tempered glass. A tempered 3.5 mm thick glass plate was used as a specimen. It was shown that two types of bifurcation and branching existed as the crack divergence. The divergence angle was smaller than the value calculated from the principle of optimal design and showed an acute angle.

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