Browsing by Author "Keskin, Onur"
Now showing items 1-20 of 26
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Adaptive backstepping approach for 2-DOF telescopes despite unknown wind disturbance
Ünal, Ali Cem; Yılmaz, Cemal Tuğrul; Kararsız, Gökhan; Yeşilyaprak, Cahit; Keskin, Onur (Institute of Electrical and Electronics Engineers Inc., 2019-07)Small ground telescopes on the marked are widely used in many space observatories and scientific researches. There are three main problems in such telescopes; positioning of the focal point and the need of tuning for both ... -
Agile development approach for the observatory control software of the DAG 4m telescope
Keskin, Onur; Güçsav, Bülent; Çoker, Deniz; Yeşilyaprak, Cahit; Zago, Lorenzo; Yerli, Sinan Kaan (SPIE, 2016)Observatory Control Software for the upcoming 4m infrared telescope of DAG (Eastern Anatolian Observatory in Turkish) is in the beginning of its lifecycle. After the process of elicitation-validation of the initial ... -
Auxiliary free space optical communication project to ensure continuous transfer of data for DAG the 4m telescope
Keskin, Onur; Yeşilyaprak, Cahit; Yerli, Sinan Kaan (SPIE, 2016)The continuity of the amount of data that the 4m DAG (Eastern Anatolia Observatory in Turkish) telescope will produce and transfer to Ataturk University is critical not to jeopardize the science programs. Though the fiber ... -
Coordination in building an observatory: A case study of Eastern Anatolian Observatory (DAG)
Şahmalı, Ali Erkan; Yeşilyaprak, Cahit; Keskin, Onur (SPIE-Int Soc Optical Engineering, 2018)Eastern Anatolian Observatory (DAG) is designed to build on one of the summits of Palandoken Mountains in Erzurum, Turkey, at an altitude of 3,151 meters. The building is under construction since 2015 and expected to be ... -
DAG 4m telescope: assembly, integration and testing
Pirnay, Olivier; Lousberg, Grégory P.; Gabriel, Eric; Marchiori, Gianpietro; Busatta, Andrea; Yeşilyaprak, Cahit; Keskin, Onur (SPIE-Int Soc Optical Engineering, 2018-06-06)AMOS with EIE as a main subcontractor, was awarded a contract in November 2014 for the design, manufacturing and installation of a 4m-class telescope for the Turkish Eastern Anatolia Observatory (DAG) situated at 3170 m ... -
The DAG Project, a 4m class telescope: The telescope main structure performance
Keskin, Onur; Marchiori, Gianpietro; Busatta, Andrea; Ghedin, L.; Marcuzzi, Enrico; Manfrin, Cristiana; Battistel, C.; Pirnay, Olivier; Flebus, Carlo; Yeşilyaprak, Cahit; Yerli, Sinan Kaan (SPIE, 2016)Dogu Anatolu Gözlemevi (DAG-Eastern Anatolia Observatory) Project is a 4m class optical, near-infrared Telescope and suitable enclosure which will be located at an altitude of 3.170m in Erzurum, Turkey. The DAG telescope ... -
DAG telescope site studies and infrastructure for possible international co-operations
Keskin, Onur; Yeşilyaprak, Cahit; Yerli, Sinan Kaan; Aliş, Sinan (SPİE-INT Soc Optical Engineering, 2016)The selected site for the 4 m DAG (Eastern Anatolian Observatory in Turkish) telescope is at "Karakaya Ridge", at 3170 m altitude (3150 m after summit management). The telescope's optical design is performed by the DAG ... -
DAG-TGI: Turbulence generator instrument for DAG (Eastern Anatolia Observatory)
Yeşilyaprak, Cahit; Keskin, Onur; Akbulak, Ümit Bora; Tezcan, Cihan Tuğrul; Güvenir, Furkan; Aydemir, Ömer Faruk (SPIE-Int Soc Optical Engineering, 2018-07-18)DAG (East Anatolia Observatory) Telescope has 4 m mirror with active optics (a0) and adaptive optics (AO) systems. In order to evaluate DAG's focal plane instruments and their installation, calibration and laboratory ... -
DAG: A new observatory and a prospective observing site for other potential telescopes
Keskin, Onur; Yeşilyaprak, Cahit; Yerli, Sinan Kaan; Güçsav, Bülent (SPIE, 2016)DAG (Eastern Anatolia Observatory is read as "Dogu Anadolu Gözlemevi" in Turkish) is the newest and largest observatory of Turkey, constructed at an altitude of 3150 m in Konakll/Erzurum provenience, with an optical and ... -
Design of a derotator for the 4 m DAG telescope
Baudet, Jeremie; Jolissaint, Laurent; Keskin, Onur; Yeşilyaprak, Cahit; Yerli, Sinan Kaan (SPIE-Int Soc Optical Engineering, 2016-08-09)This paper Silt our work on the design of a field derotator for the adaptive optics instruments platform of DAG (Dogu Anadolu Cozier vi), a new 4 in telescope for astronomical observations near the city of krzurum, l'urkey. ... -
The design of an adaptive optics telescope: the case of DAG
Keskin, Onur; Jolissaint, Laurent; Zago, Lorenzo; Yerli, Sinan Kaan; Yeşilyaprak, Cahit; Mudry, Emeric; Lousberg, Grégory P. (SPIE, 2016-07-27)In this paper, we describe in detail the optical design of DAG, a new 4 m telescope for Turkey. DAG is an "adaptive optics friendly" telescope, in a sense that each design decision is taken considering the potential impact ... -
Eastern Anatolia Observatory (DAG): Recent developments 2017
Yeşilyaprak, Cahit; Keskin, Onur (SPIE-INT Soc Optical Engineering, 2018-07-06)East Anatolia Observatory (DAG) is the new observatory of Turkey with the optical (VIS) and near-infrared (NIR) largest telescope (4 m mirror) and its robust observing site infrastructure. This national project consists ... -
Eastern Anatolia Observatory (DAG): Recent developments and a prospective observing site for robotic telescopes
Yeşilyaprak, Cahit; Yerli, Sinan Kaan; Keskin, Onur (Universidad Nacional Autonoma Mexico Instituto Astronomia, 2016)This document (Eastern Anatolia Observatory (DAG) is the new observatory of Turkey with the optical and near-infrared largest telescope (4 m class) and its robust observing site infrastructure. This national project consists ... -
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 ... -
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 ... -
Modelling and simulation studies on adaptive controller for alt-azimuth telescopes despite unknown wind disturbance and mass
Keskin, Onur; Ünal, Ali Cem; Kararsız, Gökhan; Yılmaz, Tuğrul; Yeşilyaprak, Cahit (SAGE Publications, 2020-09-15)Numerous ground-based observatories are using small sized ground telescopes for scientific research purposes. The telescopes that are available on the market have three main problems. These issues can be listed as: positioning ... -
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 ...
