Profiling of atmospheric turbulence strength and velocity 
using a generalised SCIDAR technique

Klückers, V. A.; Wooder, Nicholas J.; Nicholls, Thomas W.; Adcock, M. J.; Munro, Ian; Dainty, J. C.

doi:10.1051/aas:1998217

Cited by 93 publications

(102 citation statements)

References 14 publications

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“…The SCIDAR technique has been the subject of many papers (e.g., Rocca et al 1974;Vernin & Azouit 1983;Caccia et al 1987;Avila et al 1997;Klückers et al 1998;Prieur et al 2001). Here we present only the guidelines of the method in order to introduce the quantities that are useful for this paper.…”

Section: The Scidar Methodsmentioning

confidence: 99%

“…3 Although profiles of are routinely calculated from those obser-2 C (h) N vations, using maximum entropy methods (Vernin 1992;Klückers et al 1998) or CLEAN (Prieur et al 2001), few papers presenting wind profiles have been published (Klückers et al 1998;Avila et al 2001Avila et al , 2003Vernin et al 2000). The main reason is that wind parameters are rather difficult to retrieve from SCIDAR (or GS) data.…”

Section: Introductionmentioning

confidence: 99%

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Automatic Determination of Wind Profiles with Generalized SCIDAR

Prieur

Ávila

Daigne

et al. 2004

PUBL ASTRON SOC PAC

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Section: The Scidar Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Automatic Determination of Wind Profiles with Generalized SCIDAR

Prieur

Ávila

Daigne

et al. 2004

PUBL ASTRON SOC PAC

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“…An on-axis strehl of 15% should fall to 9% at a distance θ 0 off-axis and 6% at 2θ 0 . A better understanding of why the isoplanatic patch appears so large can only be gained by studying the height and strength of the turbulent layers in the atmosphere, for example using SCIDAR to measure C 2 n (Klückers et al 1998), combined with analysis of the modal power spectrum determined from the measured gradients on the wavefront sensor, and the changes in the corrected off-axis PSF. We are carrying out such observations in collaboration with the TMR network and will present the results in a future paper.…”

Section: Wide Field Correction: Bd +40 4124mentioning

confidence: 99%

The science potential of ALFA: Adaptive optics with natural and laser guide stars

Davies

Ott

Eckart

et al. 1999

Astron. Astrophys. Suppl. Ser.

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Abstract. Adaptive optics with laser guide stars is mandatory in order to make use of the full capabilities of 8-m class telescopes. However, progress has been slow in two particular areas: techniques for spectroscopy at diffraction limited resolution and wavefront sensing on laser guide stars. ALFA -currently the only European laser guide star adaptive optics system, and the only one in the world open to guest observers -has made significant advances in both of these. In this paper we report on our first results from summer 1998, representing significant improvements over previous performance. We report on observations using natural guide stars which demonstrate that for bright stars (m V ∼ < 8) ALFA can now reach K-band Strehl ratios in excess of 60% and easily resolve binaries at the diffraction limit of the telescope. We then present some of the first integral field spectroscopy at diffraction limited scales, showing we are able to distinguish spectra of binary stars with a separation of only 0.26 . We also discuss results from a wide field image, which indicate that useful correction (allowing binary stars and circumstellar dust shells to be resolved) can be achieved from a relatively faint star to a radius of at least 1 . Our last set of results include a correction on a galaxy using the laser guide star as the reference. The best result to date is of the galaxy UGC 1347 in Abell 262. Correcting tip-tilt on a star 41 away and higher orders on the laser, we achieved an increase in peak intensity of 2.5, and a reduction in FWHM from 1.07 to 0.40 .

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“…In the problems of investigation of atmospheric turbulence, the method of laser transmission is widely used, which makes it possible to determine both the characteristics of turbulence and the wind speed [4,5]. The adaptation of such methods to the analysis of supersonic flows requires the use of density fluctuations models that are different from the developed Kolmogorov-Obukhov turbulence model [6].…”

Section: Introductionmentioning

confidence: 99%

Investigation of turbulence in axysimmetric supersonic jet from the results of laser transillumination

Marakasov

Sazanovich

Tsvyk

et al. 2017

AIP Conference Proceedings

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Abstract. The paper presents the results of a study of the spatial structure of turbulence in a submerged supersonic jet based on laser transillumination data. On the basis of experimental data, the validity of the power model for describing the spectra of air density fluctuations in flooded supersonic jets is confirmed. The dependences of the model parameters on the distances from the axis of the jet and on the nozzle cutoff for various values of the jet parameters at the initial, weakly turbulent part of the jet are constructed. The distribution of the response amplitudes at frequencies of discrete acoustic tones by the volume occupied by the jet is constructed.

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Profiling of atmospheric turbulence strength and velocity using a generalised SCIDAR technique

Cited by 93 publications

References 14 publications

Automatic Determination of Wind Profiles with Generalized SCIDAR

Automatic Determination of Wind Profiles with Generalized SCIDAR

The science potential of ALFA: Adaptive optics with natural and laser guide stars

Investigation of turbulence in axysimmetric supersonic jet from the results of laser transillumination

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