Status of the mid-infrared E-ELT imager and spectrograph METIS

Brandl, Bernhard R.; Agócs, Tibor; Aitink-Kroes, Gabby; Bertram, Thomas; Bettonvil, Felix; Boekel, R. van; Boulade, O.; Feldt, M.; Glasse, Alistair; Glauser, Adrian M.; Güdel, M.; Hurtado, Norma; Jäger, R.; Kenworthy, Matthew A.; Mach, Michael; Meisner, Jeff; Meyer, Michael; Pantin, É.; Quanz, Sascha P.; Schmid, Hans Martin; Stuik, Remko; Veninga, Auke; Waelkens, Christoffel

doi:10.1117/12.2233974

Cited by 45 publications

(35 citation statements)

References 11 publications

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“…To analyze the performance quality of the algorithms for the pyramid sensor, we simulate ESO's ELT currently under construction in Chile. Simulations are carried out for the METIS 135 and the EPICS 136 instrument in a closed-loop setting. The reconstruction quality is quantified in terms of the long-exposure (LE) Strehl ratio.…”

Section: Quality Comparisonmentioning

confidence: 99%

Review on methods for wavefront reconstruction from pyramid wavefront sensor data

Shatokhina

Hutterer

Ramlau

2020

J. Astron. Telesc. Instrum. Syst.

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Pyramid wavefront sensors are planned to be a part of many instruments that are currently under development for the extremely large telescopes (ELT). The unprecedented scales of the upcoming ELT-era instruments are inevitably connected with serious challenges for wavefront reconstruction and control algorithms. Apart from the huge number of correcting elements to be controlled in real-time, real-life features such as the segmentation of the telescope pupil, the low wind effect, the nonlinearity of the pyramid sensor, and the noncommon path aberrations will have a significantly larger impact on the imaging quality in the ELT framework than they ever had before. We summarize various kinds of wavefront reconstruction algorithms for the pyramid wavefront sensor. Based on several forward models, different algorithms were developed in the last decades for linear and nonlinear wavefront correction. The core ideas of the algorithms are presented, and a detailed comparison of the presented methods with respect to underlying pyramid sensor models, computational complexities, and reconstruction qualities is given. In addition, we review the existing and possible solutions for the above-named real-life phenomena. At the same time, directions for further investigations are sketched.

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Section: Quality Comparisonmentioning

confidence: 99%

Review on methods for wavefront reconstruction from pyramid wavefront sensor data

Shatokhina

Hutterer

Ramlau

2020

J. Astron. Telesc. Instrum. Syst.

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“…We chose our AO system configuration to be representative of an Extremely Large Telescope (ELT) scale system for HCI based on the planned METIS system for the ELT [29]. We model a single layer atmosphere.…”

Section: A Turbulence Simulationmentioning

confidence: 99%

Impact of time-variant turbulence behavior on prediction for adaptive optics systems

2019

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For high contrast imaging systems, the time delay is one of the major limiting factors for the performance of the extreme adaptive optics (AO) sub-system and, in turn, the final contrast. The time delay is due to the finite time needed to measure the incoming disturbance and then apply the correction. By predicting the behavior of the atmospheric disturbance over the time delay we can in principle achieve a better AO performance. Atmospheric turbulence parameters which determine the wavefront phase fluctuations have time-varying behavior. We present a stochastic model for wind speed and model time-variant atmospheric turbulence effects using varying wind speed. We test a low-order, data-driven predictor, the linear minimum mean square error predictor, for a near-infrared AO system under varying conditions. Our results show varying wind can have a significant impact on the performance of wavefront prediction, preventing it from reaching optimal performance. The impact depends on the strength of the wind fluctuations with the greatest loss in expected performance being for high wind speeds.

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“…This property consequently appears also when using a Sparse Aperture Mask (SAM), for which instrument concepts exist of combining its capabilities with additional means of separating wavelengths (e.g. IFU or grating) [6][7][8] in order to create a complete (x,y,λ) data cube. To achieve this, a complex set of hardware and advanced light-analysing elements is usually employed.…”

Section: Theoretical Backgroundmentioning

confidence: 99%

Feasibility of a non-redundant pupil mask for in-flight wavelength measurements

Baccichet¹,

Labadie²

2019

International Conference on Space Optics — ICSO 2018

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The study of sparse aperture masking as a mean to extract spectral information is a relatively little investigated content. However, despite the loss of throughput that comes with this technique, it allows one to benefit from the many advantages brought by interferometry, without the need of complex phase-controlled systems. In this paper, we analyse the potential of non-redundant aperture masking for spectral measurements, highlighting its capabilities both as a tool for precise single-wavelength metrology, and as alternative to low resolution spectrographs. Although here presented as a general introduction, this technique is suitable for a large number of potential applications, ranging from compact cube-sat missions for the analysis of bright sources, to large-dish space telescopes where the increased sensitivity allows one to study fainter targets.

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Status of the mid-infrared E-ELT imager and spectrograph METIS

Cited by 45 publications

References 11 publications

Review on methods for wavefront reconstruction from pyramid wavefront sensor data

Review on methods for wavefront reconstruction from pyramid wavefront sensor data

Impact of time-variant turbulence behavior on prediction for adaptive optics systems

Feasibility of a non-redundant pupil mask for in-flight wavelength measurements

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