Measurement and characterization of nanosecond laser driven shockwaves utilizing photon Doppler velocimetry

2021 ◽  
Vol 129 (20) ◽  
pp. 205101
Author(s):  
Stanley Bovid ◽  
Allan Clauer ◽  
Micheal Kattoura ◽  
Anupam Vivek ◽  
Glenn Daehn ◽  
...  
Keyword(s):  
Nanosecond Laser ◽  
Doppler Velocimetry ◽  
Photon Doppler Velocimetry

Application of photon Doppler velocimetry for characterization of ejecta from shock-loaded samples

2018 ◽  
Vol 123 (24) ◽  
pp. 243102 ◽  
Author(s):  
A. V. Andriyash ◽  
M. V. Astashkin ◽  
V. K. Baranov ◽  
A. G. Golubinskii ◽  
D. A. Irinichev ◽  
...  
Keyword(s):  
Doppler Velocimetry ◽  
Photon Doppler Velocimetry

scholarly journals Characterization of active matter in dense suspensions with heterodyne laser Doppler velocimetry

2020 ◽  
Author(s):  
Johannes Sachs ◽  
S. Nikhilesh Kottapalli ◽  
Peer Fischer ◽  
Denis Botin ◽  
Thomas Palberg
Keyword(s):  
Laser Doppler Velocimetry ◽  
Laser Doppler ◽  
Doppler Velocimetry ◽  
Active Matter ◽  
Dense Suspensions

Atomic and Molecular Species Post-2 μs Dynamics in Laser-Induced Carbon Plasmas in Air

2020 ◽  
pp. 000370282097160
Author(s):  
Houssyen Yousfi ◽  
Samira Abdelli-Messaci ◽  
Ourida Ouamerali ◽  
Azeddine Dekhira
Keyword(s):  
Laser Fluence ◽  
Nanosecond Laser ◽  
Band Formation ◽  
Plasma Ignition ◽  
A Value ◽  
Recombination Processes ◽  
Density Values ◽  
Specific Temperature ◽  
Carbon Plasma

Laser-induced carbon plasma in air undergoes various physicochemical processes that affect the kinetic chemistry of species of the plasma plume. We report the time- and space-resolved characterization of carbon plasma produced by infrared nanosecond laser into air at atmospheric pressure. Investigating the laser fluence effect highlights dissociation for fluences >40 J cm−2, and recombination processes in the fluence range of 10–40 J cm−2. Emission intensities of C2 and CN molecules undergo an enhancement at specific spatiotemporal locations in the laser-induced plasma. At a value of 27 J/cm2 and 0.8 mm from the plasma ignition, molecular band formation is favored for the specific temperature and density values of 1.7 × 1015 cm−3 and 9502 K. The vibrational temperatures of molecules are determined using nonlinear spectral data fitting program. The shock front between laser-induced carbon plasma and air may lead to a significant shock wave that affects the occurrence of molecular CN and C2 formation. This can be explained by the distinct temperatures exhibited by CN and C2 molecules with laser fluence. The atomic carbon travels farther to react and form C2, where the ionization–recombination process plays a significant role in its formation. Collisions of C with N neutrals and N2 molecules are the plausible origin of CN generation. Moreover, the density of CN in the plasma depends on C2 molecules.

Simulating translation-induced laser speckle dynamics in photon Doppler velocimetry

2014 ◽  
Vol 53 (21) ◽  
pp. 4661 ◽  
Author(s):  
Will J. Warren ◽  
Erik A. Moro ◽  
Matthew E. Briggs ◽  
Eric B. Flynn
Keyword(s):  
Laser Speckle ◽  
Doppler Velocimetry ◽  
Photon Doppler Velocimetry

Microwave-Modulated Photon Doppler Velocimetry

2016 ◽  
Vol 28 (3) ◽  
pp. 327-330 ◽  
Author(s):  
Zhen Chen ◽  
Ryan Rettinger ◽  
Gerald Hefferman ◽  
James Smith ◽  
Jimmie Oxley ◽  
...  
Keyword(s):  
Doppler Velocimetry ◽  
Photon Doppler Velocimetry
Sign in / Sign up

Export Citation Format

Share Document