Journal of
Engineering and Technology Research

  • Abbreviation: J. Eng. Technol. Res.
  • Language: English
  • ISSN: 2006-9790
  • DOI: 10.5897/JETR
  • Start Year: 2009
  • Published Articles: 183

Full Length Research Paper

Opto-mechanical design, analysis and economical manufacture of a large aperture LIDAR receiver telescope

T. Bangia1,2*, P. K. Agarwal3, A. Kumar1, S. K. Singh1 and R. Sagar1
1Aryabhatta Research Institute of observational sciences (ARIES), Manora Peak, Nainital, Uttarakhand 263 129, India. 2Uttar Pradesh Technical University, (UPTU), Lucknow, Uttar Pradesh 226021, India. 3Ideal Institute of Management and Technology, Ghaziabad, Uttar Pradesh 201003, India.
Email: [email protected]

  • Article Number - 6FFB70511813
  • Vol.3(6), pp. 180-196, June 2011
  •  Accepted: 28 April 2011
  •  Published: 30 June 2011

Abstract

Aryabhatta Research Institute of Observational Sciences (ARIES) at Nainital (29° 22’ N, 79° 27’ E, 1950 m amsl) is located in the central Himalayan region. Taking benefit of its pristine geographical location away from major urban pollution a LIDAR system was planned at this location to study the dynamics of atmosphere. Optical design analysis of LIDAR receiver telescope with backend detection optics was carried out in ZEMAX - EE simulation package to optimize system parameters. A concave mirror of 840 mm diameter was used as primary mirror to develop a large aperture LIDAR receiver telescope for receiving back-scattered photons from atmosphere. Mirror was housed in a simple three piece mirror cell manufactured precisely and economically from cast aluminium alloy 535.0 by Lost - Foam casting process. Mirror was kept floating at 18 points on axial supports designed, analyzed and manufactured for maintaining the optical quality of telescope. Solid modeling and deflection analysis of the axial supports confirmed that deflection due to mirror weight was within 10 µ whose effect on degradation of optical parameters was analyzed and found quite negligible. 

Key words: Telescope, LIDAR, lost - foam casting (LFC), axial supports.

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