Yazar "0000-0002-2290-5228" için MF - Bildiri Koleksiyonu | Makine Mühendisliği Bölümü / Department of Mechanical Engineering listeleme
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Eastern Anatolia Observatory (DAG): The status in 2020
Yeşilyaprak, Cahit; Keskin, Onur (SPIE, 2020)East Anatolian Observatory's DAG telescope, with its 4m diameter primary mirror and VIS/IR observation capability, will be located on the Konakll-Karaya summit at an altitude of 3170 m, near the city of Erzurum, Turkey. ... -
The effects of atmospheric turbulence on astrophysical observations
Keskin, Onur (Türk Astronomi Derneği, 2020-12-11)Atmospheric turbulence is caused by random variations in temperature and pressure that spatially and temporally alter the air’s index of refraction. As electro-magnetic radiation from distant astronomical objects propagates ... -
The flexible adaptive optics concept
Jolissaint, Laurent; Eikenberry, Stephen Steve; Bouxin, Audrey; Keskin, Onur; Yeşilyaprak, Cahit (Instituto de Astrofisica de Canarias, 2017)The availability of small deformable mirrors with large number of actuators and stroke, on one hand, and versatile wavefront sensors (pyramid WFS), on the other, allows the development of AO systems whose equivalent pitch ... -
A flexible adaptive optics concept for general purpose high angular resolution science on the DAG 4m telescope
Jolissaint, Laurent; Bouxin, Audrey; Gökay, Ulaş Sabahattin; Keskin, Onur; Rigaut, Francois; Yeşilyaprak, Cahit (SPIE-Int Soc Optical Engineering, 2018)Thanks to the availability of high actuator density deformable mirrors (ALPAO 468 DM), the high versatility of the pyramid wavefront sensor and above all, the venue of essentially no noise EMCCD detectors, it becomes ... -
In Flange Derotator Design for the 4m DAG telescope
Ünal, Ali Cem; Sarajlic, Mirsad; Jolissaint De Sepibus, Laurent; Keskin, Onur; Yeşilyaprak, Cahit; Baudet, Jeremie (SPIE-INT Soc Optical Engineering, 2018-07-06)The field rotation effect can be described as observing the gyration of an object with the pupil of the Eastern Anatolian Observatory (DAG) telescope around the optical axis under the influence of the latitude of the ... -
Integrated opto-dynamic modeling of the 4-m DAG telescope image quality performance
Keskin, Onur; Zago, Lorenzo; Guex, Benjamin; Yeşilyaprak, Cahit; Yerli, Sinan Kaan (SPIE-Int Soc Optical Engineering, 2016)The Turkish DAG 4-m telescope is currently through the final design stage. It is to be located on a 3170 m mountain top in Eastern Anatolia. The telescope will be a state-of-The art device, alt-Az mount with active primary ... -
İstabul Üniversitesi gözlemevi odak düzlemi aygıtı test ve karakterizasyon laboratuvarı
Aliş, Sinan; Güver, Tolga; Erol, Ayşe; Ege, Ergün; Kay, Burak; Yelkenci, Korhan; Yeşilyaprak, Cahit; Keskin, Onur; Yerli, Sinan Kaan; Sercan, Fahreettin; Fişek, Süleyman (Türk Astronomi Derneği, 2020-12-11)Doğu Anadolu Gözlemevi Odak Düzlemi Aygıtları ve Adaptif Optik Sistemi başlıklı, 2016K121370 numaralı T.C. Kalkınma Bakanlığı projesi ve İstanbul Üniversitesi Rektörlüğü desteğinde yürüyen çalışmalar kapsamında İstanbul ... -
A microwave kinetic inductance detector for the DAG telescope
Keskin, Onur; Güver, Tolga; Mazin, Benjamin A.; O'Brien, Kieran S.; Kay, Burak; Aliş, Sinan; Yelkenci, F. Korhan; Yeşilyaprak, Cahit; Yerli, Sinan Kaan; Erol, Ayşe (SPIE, 2016)We present the details of a proposed microwave kinetic inductance detector (MKID) for the DAG (Eastern Anatolia Observatory in Turkish) telescope, DAG-MKID. The observatory will have a modern 4m size telescope that is ... -
Observatory building design: A case study of DAG with infrastructure and facilities
Şahmalı, Ali Erkan; Yeşilyaprak, Cahit; Yerli, Sinan Kaan; Keskin, Onur (SPIE, 2018-07-29)[No abstract available] -
Observatory building design: A case study of DAG with infrastructure and facilities
Keskin, Onur; Şahmalı, Ali Erkan; Yeşilyaprak, Cahit; Yerli, Sinan Kaan (SPIE, 2016-08-19)Eastern Anatolian Observatory (DAG), will be built in one of the well-known mountain ridges of Erzurum, Turkey, at latitude of 39°46'50, longitude of 41°13'35 and an altitude of 3.151 meters. As well as erecting the largest ... -
Observing with DAG: performance metrics of imaging and spectroscopy
Jolissaint, Laurent; Zago, Lorenzo; Keskin, Onur (Türk Astronomi Derneği, 2020-12-11)DAG telescope will be designed as a telescope with adaptive optics and seeing limited modes of observation. Its primary mirror will be a thin meniscus, controlled in shape by an active optics system. This implies specific ... -
OPAM tarafından üretilen derotator sistemi ve TROIA (Turkish Adaptive Optics System for Infrared Astronomy) adaptif optik sistemi
Keskin, Onur (Türk Astronomi Derneği, 2020-12-11)DAG teleskopu için FMV Işık Üniversitesi Optomekatronik Uygulama ve Araştırma Merkezi’nde (OPAM) son tasarımı başarıyla bitirilerek, üretim aşamasına geçilen derotator ve adaptif optik (TROIA) sistemleri tanıtılacaktır. -
Optical design of the adaptive optics system for DAG, the new 4 m Turkish telescope
Bouxin, Audrey; Jolissaint, Laurent; Keskin, Onur; Yeşilyaprak, Cahit; Spanò, Paolo (SPIE, 2020)We present the design of the Adaptive Optics System for the new Turkish 4-m telescope (DAG). The AO will use a pyramid WFS, with a double prism and a no noise EM-CCD camera to allow for oversampling of the pupil images and ... -
Project management and status update for DAG (Eastern Anatolia Observatory) the 4 meter VIS/IR optical telescope
Keskin, Onur; Yeşilyaprak, Cahit; Jolissaint, Laurent (SPIE-Int Soc Optical Engineering, 2018)The new 4 m Turkish telescope, DAG (East Anatolian Observatory, Fig. 2), will be located on the summit of the mountain Konakli-Karakaya, at an altitude of 3170 m, near the city of Erzurum, Turkey. First light is expected ... -
Project management of DAG: Eastern Anatolia Observatory
Keskin, Onur; Yeşilyaprak, Cahit; Yerli, Sinan Kaan; Zago, Lorenzo; Güver, Tolga; Aliş, Sinan (SPIE, 2016)The four meter DAG (Eastern Anatolia Observatory in Turkish) telescope is not only the largest telescope in Turkey but also the most promising telescope in the northern hemisphere with a large potential to offer scientific ... -
Status of the Focal Plane Instrumentation (FPI) Project of the 4 m DAG Telescope
Keskin, Onur; Yerli, Sinan Kaan; Yeşilyaprak, Cahit; Güver, Tolga; Aliş, Sinan; Yelkenci, Filiz Korhan; Güçsav, Bülent Burak; Arabacı, Mehtap Özbey; Erol, Ayşe (SPIE, 2016-08-09)DAG (Eastern Anatolia Observatory in Turkish) will be the newest and largest (4m) observatory of Turkey in both optical (VIS) and near-infrared (NIR) Owith its robust observing site infrastructure. The telescope is designedOto ... -
TROIA adaptive optics system for DAG Telescope
Keskin, Onur; Jolissaint, Laurent; Bouxin, Audrey; Yeşilyaprak, Cahit (SPIE, 2020-12-13)This paper presents the specifications of TROIA-TuRkish adaptive Optics system for Infrared Astronomy system, the science rationale for these specifications, and description of the site technical and environmental conditions ... -
TROIA Adaptive optics system for DAG telescope; assembly and laboratory performance prior to on-sky assessment
Keskin, Onur; Jolissaint, Laurent; Bouxin, Audrey; Yeşilyaprak, Cahit (SPIE, 2022-08-29)In this article, we describe the current status of the development of TROIA* a pyramid wavefront sensor based adaptive optics system designed for DAG, a new 4 m telescope located in Eastern Anatolia, Turkey. The wavefront ... -
Turkey's next big science project: DAG the 4 meter telescope
Keskin, Onur; Yeşilyaprak, Cahit; Yerli, Sinan Kaan; Zago, Lorenzo; Jolissaint, Laurent (SPIE-INT Soc Optical Engineering, 2014)The DAG (Turkish for Eastern Anatolia Observatory) 4-m telescope project has been formally launched in 2012, being fully funded by the Government of Turkey. This new observatory is to be located on a 3170 m altitude ridge ... -
Wind disturbance cancellation for smaller alt-azimuth telescopes
Ünal, Ali Cem; Kararsız, Gökhan; Yılmaz, Cem Tuğrul; Keskin, Onur; Yeşilyaprak, Cahit (Universidad Nacional Autonoma de Mexico, 2019-10)This study focuses on eliminating unknown amplitude wind disturbance for 2-DOF alt-azimuth configuration small telescopes. An adaptive controller is designed to overcome wind disturbance as a set and forget system. The ...