The 3,6 m Indo-Belgian Devasthal Optical Telescope: general description

Ninane, Nathalie; Flebus, Carlo; Kumar, Brijesh

doi:10.1117/12.925921

Cited by 16 publications

(19 citation statements)

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“…Weight of such thin mirrors (thickness to diameter ratio 1:400) reduces significantly in comparison to primary mirrors having thickness to diameter ratio 1:6 used earlier in order to avoid flexure against gravity while telescopes are pointed towards different direction in the sky. It is mainly because of this reason, that India's largest sized 3.6 m DOT, the first modern technology optical and near-IR telescope of the country, uses the latest technological developments taken in this field [22,[30][31][32][33][34][35][36]. Construction of DOT can therefore provide valuable technological knowhow for the young engineers and scientists of the country and go a long way in developing 8-10 meter sized Indian optical and near-IR telescope.…”

Section: Impact Of Technological Development On Modern Optical and Nementioning

confidence: 99%

A Global Prospective of the Indian Optical and Near-Infrared Observational Facilities in the Field of Astronomy and Astrophysics: A Review

Sagar

2016

Proc. Natl. Acad. Sci., India, Sect. A Phys. Sci.

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A review of modernization and growth of ground based optical and near-infrared astrophysical observational facilities in the globe attributed to the recent technological developments in opto-mechanical, electronics and computer science areas is presented. Hubble Space Telescope (HST) and speckle and adaptive ground based imaging have obtained images better than 0.1 arc sec angular resolution bringing the celestial objects closer to us at least by a factor of 10 during the last two decades. From the light gathering point of view, building of large size (> 5meter aperture) ground based optical and near-infrared telescopes based on latest technology have become economical in recent years. Consequently, in the world, a few 8-10 meter size ground-based optical and near-infrared telescopes are being used for observations of the celestial objects, three 25-40 meter size are under design stage and making of a ~ 100 meter size telescope is under planning stage. In India, the largest sized optical and near-infrared telescope is the modern 3.6-meter located at Devasthal, Nainital. However, the existing Indian moderate size telescopes equipped with modern backend instruments have global importance due to their geographical location. Recently, the Government of India approved India's participation in the Thirty Meter Telescope (TMT) project.

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Section: Impact Of Technological Development On Modern Optical and Nementioning

confidence: 99%

A Global Prospective of the Indian Optical and Near-Infrared Observational Facilities in the Field of Astronomy and Astrophysics: A Review

Sagar

2016

Proc. Natl. Acad. Sci., India, Sect. A Phys. Sci.

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“…Mathematical model of the behaviour of the flow controller is derived from equation given by manufacturer (2) …”

Section: Flow Controllersmentioning

confidence: 99%

“…The Telescope design (1) was presented 4 years ago at Marseille; since then it has been fully assembled (2) and tested at sub-system and system levels in AMOS assembly hall. Figure 1 shows pictures of the telescope in AMOS assembly hall.…”

Section: Introductionmentioning

confidence: 99%

The 3,6 m Indo-Belgian Devasthal Optical Telescope: the hydrostatic azimuth bearing

Ville¹,

Piérard²,

Bastin³

2012

SPIE Proceedings

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AMOS SA has been awarded of the contract for the design, manufacturing, assembly, tests and on site installation (Devasthal, Nainital in central Himalayan region) of the 3.6 m Indo-Belgian Devasthal Optical Telescope (IDOT). The telescope has a Ritchey-Chrétien optical configuration with a Cassegrain focus equipped with one axial port and two side ports. The primary mirror is a meniscus active mirror. The mount is an Alt-Az type with for the azimuth axis a 5 m diameter hydrostatic track. This paper presents the solution adopted by AMOS to meet the specific requirements for the azimuth axis. The track is designed to be able to control the positioning of the telescope around the azimuth axis with an accuracy of 0.05 arc second for all tracking configurations. The challenge came from this tight accuracy with a mass in rotation weighting 125 tons. The azimuth track was mounted and tested in AMOS workshop; the tests and performances are also discussed.

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“…The Telescope design [1] was presented 4 years ago at Marseille; since then it has been fully assembled [2] and tested at sub-system and system levels in AMOS assembly hall [3].…”

Section: Introductionmentioning

confidence: 99%

The 3,6 m optical telescope for ARIES: the control system

Gabriel¹,

Bastin²,

Piérard³

2012

SPIE Proceedings

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AMOS SA has been awarded of the contract for the design, manufacturing, assembly, tests and on site installation (Nainital, Devasthal site at 2540 mm altitude) of the 3,6 m Optical Telescope for ARIES (Aryabhatta Research Institute of Observational Sciences), Nainital (India). This paper describes the architecture deployed for the whole telescope control. It contains, in others, the Telescope Control System (TCS), the Active Optic System (AOS) and the Auto Guiding Unit (AGU). The TCS generates the telescope axes trajectory from the celestial coordinates selected by the operator and drives the main axes. The AOS generates the force set points for each M1 actuator and the position set point of the M2 hexapod from the data given by a wave front sensor. The AGU sends the main axes corrections from the movement of the guide star on the guiding CCD. The modules shall communicate between them to optimize the telescope behavior and with the Observatory Control System (OCS) for data reporting and synchronization with the instrument.

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The 3,6 m Indo-Belgian Devasthal Optical Telescope: general description

Cited by 16 publications

References 0 publications

A Global Prospective of the Indian Optical and Near-Infrared Observational Facilities in the Field of Astronomy and Astrophysics: A Review

A Global Prospective of the Indian Optical and Near-Infrared Observational Facilities in the Field of Astronomy and Astrophysics: A Review

The 3,6 m Indo-Belgian Devasthal Optical Telescope: the hydrostatic azimuth bearing

The 3,6 m optical telescope for ARIES: the control system

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