Extracting Atmospheric Optical Turbulence Parameters from AAOL-BC Wavefront Measurements

2022 ◽  
Author(s):  
Matthew Kalensky ◽  
Eric J. Jumper ◽  
Stanislav Gordeyev
Keyword(s):  
Optical Turbulence ◽  
Turbulence Parameters

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).

scholarly journals Measuring optical turbulence parameters with a three-aperture receiver

2007 ◽  
Author(s):  
David T. Wayne ◽  
Ronald L. Phillips ◽  
Larry C. Andrews ◽  
Frida Stromömqvist Vetelino ◽  
Brad Griffis ◽  
...  
Keyword(s):  
Optical Turbulence ◽  
Turbulence Parameters

scholarly journals Determination of the optical turbulence parameters from the adaptive optics telemetry: critical analysis and on-sky validation

2018 ◽  
Vol 57 (27) ◽  
pp. 7837 ◽  
Author(s):  
Laurent Jolissaint ◽  
Sam Ragland ◽  
Julian Christou ◽  
Peter Wizinowich
Keyword(s):  
Adaptive Optics ◽  
Critical Analysis ◽  
Optical Turbulence ◽  
Turbulence Parameters

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.

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