Solar adaptive optics system using an electromagnetic deformable mirror

Miura, Noriaki; Noto, Yuuki; Kato, Shuusuke; Yokoyama, Fumihito; Kuwamura, Susumu; Baba, Naoshi; Hanaoka, Yoichiro; Nagata, Shinji; Ueno, S.; Kitai, Reizaburou; Ichimoto, Kiyoshi; Takami, Hideki

doi:10.1007/s10043-009-0109-1

Cited by 14 publications

(15 citation statements)

References 9 publications

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“…Keller et al (2003) use ADF for the IR AO system of the McMath-Pierce solar telescope. So do Miura et al (2009) in their recently presented AO system used for the domeless solar telescope at Hida Observatory.…”

Section: Correlation Algorithmsmentioning

confidence: 99%

Evaluation of image-shift measurement algorithms for solar Shack-Hartmann wavefront sensors

Löfdahl

2010

A&A

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Context. Solar Shack-Hartmann wavefront sensors measure differential wavefront tilts as the relative shift between images from different subapertures. There are several methods in use for measuring these shifts. Aims. We evaluate the inherent accuracy of the methods and the effects of various sources of error, such as noise, bias mismatch, and blurring. We investigate whether Z-tilts or G-tilts are measured. Methods. We test the algorithms on two kinds of artificial data sets, one corresponding to images with known shifts and one corresponding to seeing with different r 0 . Results. Our results show that the best methods for shift measurements are based on the square difference function and the absolute difference function squared, with subpixel accuracy accomplished by use of two-dimensional quadratic interpolation. These methods measure Z-tilts rather than G-tilts.

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Section: Correlation Algorithmsmentioning

confidence: 99%

Evaluation of image-shift measurement algorithms for solar Shack-Hartmann wavefront sensors

Löfdahl

2010

A&A

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“…The control frequencies of 450 and 900 Hz correspond to those of the AO system in laboratory experiments and solar observations, respectively. The reason for the difference in the control frequencies arose from the use of different algorithms in wavefront sensing: image centroiding 7 and sums-of-absolute-differences 10 . Figures 4(a) and (b) plot the gains of the closed-loop error transfer functions when the control frequencies of the AO system were 450 and 900 Hz, respectively.…”

Section: System Descriptionmentioning

confidence: 99%

“…Recently, a high-speed model of the electromagnetic mirror has become commercially available. We used it for an astronomical purpose for the first time, to our knowledge 10 . In this paper, we describe the performance of an experimental AO system using the new deformable mirror and report the results of laboratory experiments and solar observations.…”

Section: Introductionmentioning

confidence: 99%

Advances in solar adaptive optics system at the domeless solar telescope of the Hida Observatory

et al. 2009

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A solar adaptive optics system for the 60 cm domeless solar telescope of the Hida Observatory in Japan is developed. A high-speed deformable mirror with 52 electromagnetic actuators is newly used in an experimental adaptive optics system. The use of the mirror resulted in the improvement of Strehl ratios in laboratory experiments. In solar observations, the system worked well when solar granulation was used as a target for wavefront sensing. An adaptive optics system being developed for a vertical spectrograph of the domeless solar telescope is described.

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“…We have been developing a preliminary solar AO system at the 60 cm domeless solar telescope of the Hida Observatory in Japan [5][6][7][8][9] . The system has a deformable mirror (DM) with 97 electromagnetic actuators and a Shack-Hartmann-type wavefront sensor with a 4000-fps CMOS camera and a 10x10-microlens array.…”

Section: Introductionmentioning

confidence: 99%

Development of a new solar adaptive optics system at the Hida Observatory

et al. 2014

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We are developing a new adaptive optics (AO) system for the 60cm domeless solar telescope of the Hida Observatory, Japan. The system has a deformable mirror with 97 piezo-actuators, a Shack-Hartmann wavefront sensor with a 10x10-microlens array and standard personal computers. We conducted solar observations in September, 2013, and confirmed that our AO system cancelled image-shifts so that the deviations were within the resolution of the telescope. We report the detailed performances of our new AO system.

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Solar adaptive optics system using an electromagnetic deformable mirror

Cited by 14 publications

References 9 publications

Evaluation of image-shift measurement algorithms for solar Shack-Hartmann wavefront sensors

Evaluation of image-shift measurement algorithms for solar Shack-Hartmann wavefront sensors

Advances in solar adaptive optics system at the domeless solar telescope of the Hida Observatory

Development of a new solar adaptive optics system at the Hida Observatory

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