Measuring horizontal atmospheric turbulence at ground level from optical turbulence generator (OTG) using a 1D sensor

2017 ◽  
Author(s):  
Omar J. Tíjaro Rojas ◽  
Yezid Torres Moreno ◽  
William T. Rhodes
Keyword(s):  
Atmospheric Turbulence ◽  
Ground Level ◽  
Optical Turbulence ◽  
Turbulence Generator

Characterizing horizontal atmospheric turbulence from air velocity in an optical turbulence generator

2020 ◽  
Vol 458 ◽  
pp. 124870
Author(s):  
Jhonatan Hernandez ◽  
Jesus Rincón ◽  
Alexander Ballesteros ◽  
Omar Tíjaro ◽  
Yezid Torres
Keyword(s):  
Atmospheric Turbulence ◽  
Optical Turbulence ◽  
Air Velocity ◽  
Turbulence Generator

Multiple-layer optical turbulence generator principle and SLODAR characterization: preliminary results

2004 ◽  
Author(s):  
Laurent Jolissaint ◽  
Onur Keskin ◽  
Colin Bradley ◽  
Brian Wallace ◽  
Aaron Hilton
Keyword(s):  
Optical Turbulence ◽  
Preliminary Results ◽  
Multiple Layer ◽  
Turbulence Generator

scholarly journals Atmospheric Characterization Based on Relative Humidity Control at Optical Turbulence Generator

Atmosphere ◽  
2019 ◽  
Vol 10 (9) ◽  
pp. 550
Author(s):  
Jhonny Villamizar ◽  
Manuel Herreño ◽  
Omar Tíjaro ◽  
Yezid Torres
Keyword(s):  
Relative Humidity ◽  
Laser Beam ◽  
Optical Axis ◽  
Optical Turbulence ◽  
Air Velocity ◽  
Limited Effect ◽  
Horizontal Path ◽  
Physical Variables ◽  
Turbulence Parameters ◽  
Turbulence Generator

In atmospheric turbulence, relative humidity has been almost a negligible variable due to its limited effect, compared with temperature and air velocity, among others. For studying the horizontal path, a laser beam was propagated in a laboratory room, and an Optical Turbulence Generator (OTG) was built and placed along the optical axis. Additionally, there was controlled humidity inside the room and measuring of some physical variables inside the OTG device for determining its effects on the laser beam. The experimental results show the measurements of turbulence parameters C n 2 , l o , and σ I 2 from beam centroids fluctuations, where increases in humidity generated stronger turbulence.

scholarly journals Dome C site testing: long term statistics of integrated optical turbulence parameters at ground level

2012 ◽  
Vol 8 (S288) ◽  
pp. 300-301 ◽  
Author(s):  
E. Aristidi ◽  
A. Agabi ◽  
E. Fossat ◽  
A. Ziad ◽  
L. Abe ◽  
...  
Keyword(s):  
Strong Dependence ◽  
Ground Level ◽  
Bright Star ◽  
Optical Turbulence ◽  
Outer Scale ◽  
Site Testing ◽  
Visible Wavelength ◽  
Integrated Optical ◽  
Turbulence Parameters

AbstractWe present long term site testing statistics based on DIMM and GSM data obtained at Dome C, Antarctica. These data have been collected on the bright star Canopus since the end of 2003. We give values of the integrated turbulence parameters in the visible (wavelength 500 nm). The median value we obtained for the seeing are 1.2 arcsec, 2.0 arcsec and 0.8 arcsec at respective elevations of 8m, 3m and 20m above the ground. The isoplanatic angle median value is 4.0 arcsec and the median outer scale is 7.5m. We found that both the seeing and the isoplanatic angle exhibit a strong dependence with the season (the seeing is larger in winter while the isoplanatic angle is smaller).

Daytime optical turbulence profiling with a profiler of the differential solar limb

2020 ◽  
Vol 499 (2) ◽  
pp. 1909-1917
Author(s):  
Tengfei Song ◽  
Zhanchuan Cai ◽  
Yu Liu ◽  
Mingyu Zhao ◽  
Yuliang Fang ◽  
...  
Keyword(s):  
Atmospheric Turbulence ◽  
Adaptive Optics ◽  
Solar Limb ◽  
Coefficient Matrix ◽  
Image Motion ◽  
Index Structure ◽  
Test Results ◽  
Optical Turbulence ◽  
Optical Telescopes ◽  
Turbulence Parameters

ABSTRACT Atmospheric turbulence reduces the image quality and resolution of ground-based optical telescopes. Future large solar telescopes (e.g. the CGST, China Giant Solar Telescope) should be equipped with adaptive optics (AO) systems. The design of AO systems is associated with atmospheric optical turbulence parameters, especially the profile of the refractive index structure $C_{n}^{2}(h)$. With the solar differential image motion monitor (S-DIMM) and the profiler of the moon limb (PML), a simplified version of a PML, termed a profiler of the differential solar limb (PDSL), was built in order to determine the daytime $C_{n}^{2}(h)$ and other atmospheric turbulence parameters. A PDSL with differential solar limb fluctuations was used to determine the turbulence profiling, and the extended solar limb extends the range of separation angles for a higher resolution of the height profile. The PDSL structure and its performance are described. In addition, numerical simulations were conducted to verify the effectiveness of the method. As revealed from the simulation results, the layered integral coefficient matrix is capable of solving the discretization error and enhancing the inversion accuracy of the turbulence contour. The first test results at Mt Wumingshan (a candidate site for the CGST) are presented.

scholarly journals Statistics of the Optical Turbulence from the Micrometeorological Measurements at the Baykal Astrophysical Observatory Site

Atmosphere ◽  
2019 ◽  
Vol 10 (11) ◽  
pp. 661 ◽  
Author(s):  
Artem Shikhovtsev ◽  
Pavel Kovadlo ◽  
Vladimir Lukin ◽  
Victor Nosov ◽  
Alexander Kiselev ◽  
...  
Keyword(s):  
Refractive Index ◽  
Atmospheric Turbulence ◽  
Vertical Structure ◽  
Structure Characteristic ◽  
Turbulence Structure ◽  
Optical Turbulence ◽  
Wavefront Analysis ◽  
Micrometeorological Measurements

The paper focuses on the investigations of the optical turbulence structure. The distributions of the repeatability of the structure characteristic of the air refractive index are obtained. A scenario of decreasing the intensity of the optical turbulence in the summer is discussed. Numerical estimates of this scenario are given. Using classical methods of wavefront analysis, the results of the first studies of the vertical structure of atmospheric turbulence at the Baykal astrophysical observatory site are presented.

Atmospheric turbulence generator for adaptive optical systems testing

2007 ◽  
Author(s):  
Christopher C. Wilcox ◽  
Ty Martinez ◽  
Freddie Santiago ◽  
Jonathan R. Andrews ◽  
Sergio R. Restaino ◽  
...  
Keyword(s):  
Atmospheric Turbulence ◽  
Optical Systems ◽  
Turbulence Generator
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