Wind speed and turbulence estimation with a backscatter lidar at a single line of sight

2011 ◽  
Author(s):  
Sergio Tomas ◽  
Michaël Sicard ◽  
Francesc Rocadenbosch
Keyword(s):  
Wind Speed ◽  
Single Line ◽  
Line Of Sight

First Demonstration of an Acousto-Optically Modulated Quantum Cascade Laser As a Broadband, Time-Resolved Combustion Diagnostic

2018 ◽  
Author(s):  
Zachary E. Loparo ◽  
Kareem Ahmed ◽  
Subith S. Vasu ◽  
Andrey V. Muraviev ◽  
Pedro Figueiredo ◽  
...  
Keyword(s):  
Quantum Cascade Laser ◽  
Gas Turbines ◽  
Chemical Kinetic ◽  
Single Line ◽  
Line Of Sight ◽  
Spectral Measurements ◽  
Time Resolved ◽  
Quantum Cascade ◽  
No Formation ◽  
Multiple Species

We provide the first demonstration of an acousto-optically modulated quantum cascade laser (AOM QCL) system as a diagnostic for combustion by measuring nitric oxide (NO), a highly-regulated emission produced in gas turbines. The system provides time-resolved broadband spectral measurements of the present gas species via a single line of sight measurement, offering advantages over widely used narrowband absorption spectroscopy (e.g., the potential for simultaneous multi-species measurements using a single laser) and considerably faster (> 15kHz rates and potentially up to MHz) than sampling techniques which employ FTIR or GC/MS. The developed AOM QCL system yields fast tunable output covering a spectral range of 1725–1930 cm−1 with a linewidth of 10–15 cm−1. For the demonstration experiment, the AOM QCL system has been used to obtain time-resolved spectral measurements of NO formation during the shock heating of mixture of a 10% nitrous oxide (N2O) in a balance of argon over a temperature range of 1245–2517 K and a pressure range of 3.6–5.8 atm. Results were in good agreement with chemical kinetic simulations. The system shows revolutionary promise for making simultaneous time-resolved measurements of multiple species concentrations and temperature with a single line of sight measurement.

Shock Tube Demonstration of Acousto-Optically Modulated Quantum Cascade Laser as a Broadband, Time-Resolved Combustion Diagnostic

2018 ◽  
Vol 140 (11) ◽  
Author(s):  
Zachary E. Loparo ◽  
Andrey V. Muraviev ◽  
Pedro Figueiredo ◽  
Arkadiy Lyakh ◽  
Robert E. Peale ◽  
...  
Keyword(s):  
Quantum Cascade Laser ◽  
Gas Turbines ◽  
Chemical Kinetic ◽  
Single Line ◽  
Line Of Sight ◽  
Spectral Measurements ◽  
Time Resolved ◽  
Quantum Cascade ◽  
No Formation ◽  
Multiple Species

We provide the first demonstration of an acousto-optically modulated quantum cascade laser (AOM QCL) system as a diagnostic for combustion by measuring nitric oxide (NO), a highly regulated emission produced in gas turbines. The system provides time-resolved broadband spectral measurements of the present gas species via a single line of sight measurement, offering advantages over widely used narrowband absorption spectroscopy (e.g., the potential for simultaneous multispecies measurements using a single laser) and considerably faster (>15 kHz rates and potentially up to MHz) than sampling techniques, which employ fourier transform infrared (FTIR) or GC/MS. The developed AOM QCL system yields fast tunable output covering a spectral range of 1725–1930 cm−1 with a linewidth of 10–15 cm−1. For the demonstration experiment, the AOM QCL system has been used to obtain time-resolved spectral measurements of NO formation during the shock heating of mixture of a 10% nitrous oxide (N2O) in a balance of argon over a temperature range of 1245–2517 K and a pressure range of 3.6–5.8 atm. Results were in good agreement with chemical kinetic simulations. The system shows revolutionary promise for making simultaneous time-resolved measurements of multiple species concentrations and temperature with a single line of sight measurement.

scholarly journals The single-line-of-sight, time-resolved x-ray imager diagnostic on OMEGA

2018 ◽  
Vol 89 (10) ◽  
pp. 10G117 ◽  
Author(s):  
W. Theobald ◽  
C. Sorce ◽  
M. Bedzyk ◽  
S. T. Ivancic ◽  
F. J. Marshall ◽  
...  
Keyword(s):  
Single Line ◽  
Line Of Sight ◽  
Time Resolved ◽  
X Ray

scholarly journals Progress on the development of a single line of sight x-ray framing camera

2004 ◽  
Vol 75 (10) ◽  
pp. 4054-4056 ◽  
Author(s):  
D. K. Bradley ◽  
J. P. Holder ◽  
C. M. Damian ◽  
K. W. Piston ◽  
P. M. Bell ◽  
...  
Keyword(s):  
Single Line ◽  
Line Of Sight ◽  
X Ray ◽  
Framing Camera

Further development of a single line of sight x-ray framing camera

2003 ◽  
Vol 74 (3) ◽  
pp. 2191-2193 ◽  
Author(s):  
J. P. Holder ◽  
K. W. Piston ◽  
D. K. Bradley ◽  
P. M. Bell ◽  
A. K. L. Dymoke-Bradshaw ◽  
...  
Keyword(s):  
Single Line ◽  
Line Of Sight ◽  
X Ray ◽  
Further Development ◽  
Framing Camera

The Role of Wind Speed and Wind Shear for Banner Cloud Formation

2019 ◽  
Vol 77 (4) ◽  
pp. 1199-1212
Author(s):  
Volkmar Wirth ◽  
Pascal Bubel ◽  
Joachim Eichhorn ◽  
Elmar Schömer ◽  
Tobias Kremer ◽  
...  
Keyword(s):  
Wind Speed ◽  
Wind Shear ◽  
Cloud Formation ◽  
Line Of Sight ◽  
Vortical Structures ◽  
Ambient Wind ◽  
Large Eddy ◽  
Flow Geometry ◽  
Wind Lidar

Abstract Banner clouds are clouds that appear to be attached to the leeward face of a steep mountain. This paper investigates the role of wind speed and wind shear for the formation of banner clouds. Large-eddy simulations are performed to simulate the flow of dry air past an idealized pyramid-shaped mountain. The potential for cloud formation is diagnosed through the Lagrangian vertical parcel displacement, which in the case of a banner cloud shows a plume of large values in the lee of the mountain. In addition, vortical structures are visualized through streamlines and their curvature. A series of sensitivity experiments indicates that both the flow and the banner cloud occurrence are largely independent of the ambient wind speed U. On the other hand, the shear of the ambient wind has a profound impact on the location of the stagnation point on the windward face as well as on the flow geometry in the lee of the mountain. The relevant measure for shear is H/Hs, where H denotes the height of the mountain and Hs = U/Uz is the scale height of the shear (with Uz denoting the scale of the shear). The simulations are also used to compute the line-of-sight velocity component seen by a hypothetical Doppler wind lidar positioned in the lee of the mountain; the analysis suggests that such sensitivities can potentially be detected using modern wind lidar technology.

scholarly journals Simultaneous neutron and x-ray imaging of inertial confinement fusion experiments along a single line of sight at Omega

2015 ◽  
Vol 86 (4) ◽  
pp. 043503 ◽  
Author(s):  
C. R. Danly ◽  
T. H. Day ◽  
D. N. Fittinghoff ◽  
H. Herrmann ◽  
N. Izumi ◽  
...  
Keyword(s):  
Inertial Confinement Fusion ◽  
Single Line ◽  
Line Of Sight ◽  
Inertial Confinement ◽  
X Ray ◽  
X Ray Imaging ◽  
Confinement Fusion ◽  
Fusion Experiments

scholarly journals Radial Profile Estimation of Electron Density in a Linear Plasma Device NUMBER Using a Single Line-of-Sight Signal

2021 ◽  
Vol 16 (0) ◽  
pp. 2401042-2401042
Author(s):  
Minami SUGIMOTO ◽  
Atsushi OKAMOTO ◽  
Takaaki FUJITA ◽  
Hideki ARIMOTO ◽  
Shunya HIGUCHI ◽  
...  
Keyword(s):  
Electron Density ◽  
Radial Profile ◽  
Single Line ◽  
Line Of Sight ◽  
Plasma Device ◽  
Profile Estimation ◽  
Linear Plasma
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