IIA Institutional Repository

Browsing by Author "Chinnappan, V"

Browsing by Author "Chinnappan, V"

Sort by: Order: Results:

  • Low-cost adaptive optics for astronomical applications 
    Chinnappan, V; Saxena, A. K; Sreenivasan, A (The International Society for Optical Engineering (SPIE), 2001-09)
    Recent advancement in the technology in integrated circuit fabrication and new smart sensors allow us to implement adaptive optics systems which is otherwise not possible to implement a few years back with limited resources ...
  • The Microprocessor control of the Kavalur 234-cm optical telescope 
    Chinnappan, V; Bhattacharyya, J. C (Astronomical Society of India, 1985-06)
    This paper gives an introduction to the control system of the 234-cm optical telescope. The computer used in control is based on an INTEL 16 bit microprocessor. The VAX 11/780 system has a supervisory role in the control ...
  • Narrow Band Photometry in Emission Lines during the Total Solar Eclipse of October 24, 1995 
    Singh, J; Cowsik, R; Venkatakrishnan, P; Srinivasan, R; Chinnappan, V; Raju, K. P; Srikanth, R (Indian Institute of Astrophysics, Bangalore, 1997)
    To investigate the spatial variation of tempereture and density within coronal strucures, narrow band photometry in three coronal emission lines was done during this eclipse. The emission lines 6374 (FeX), 7892 (Fe XI) and ...
  • A new approach to stellar image correction for atmospherically degraded images 
    Chinnappan, V (Indian Institute of Astrophysics, 2006-08)
    Atmospheric turbulence is the main cause of image degradation and poor resolution at the focal plane of a perfectly made optical telescope. It is necessary to make corrective measures to improve the optical wave-front, ...
  • Night time variation of Fried's parameter at VBT, Kavalur 
    Saha, S. K; Chinnappan, V (Astronomical Society of India, 1999)
    The night time variation of the Fried's parameter, r lower script o is measured on 28-29 March 1991, at the Cassegrain focus of 2.34 m Vainu Bappu Telescope (VBT), at Vainu Bappu Observatory (VBO), Kavalur, India, using ...
  • Performance evaluation of high-speed camera system for adaptive optics 
    Chinnappan, V; Saxena, A. K; Sreenivasan, A (Astronomical Society of India, 2002-09)
    Atmospheric turbulence distorts the incoming wavefront from the star light, thus severely limiting the resolution of the groundbased optical telescopes (Fried 1966). Adaptive optics is being implemented in all big ...
  • Performance of the low light level CCD camera for speckle imagmg 
    Saha, S. K; Chinnappan, V (Astronomical Society of India, 2002-09)
    A new generation CCD detector caJ.led low light level OOD (L3CCD) that performs like an intensified CCD without incorporating a micro channel plate (MOP) for light amplification was procured and tested. A series of ...
  • Speckle interferometric observations of close binary stars 
    Saha, S. K; Chinnappan, V; Yeshwanth, L; Anbazhagan, P (Astronomical Society of India, 2002-09)
    Speckle interferometric technique is employed to record a series of hundreds of short-exposure images of several close binary stars with sub-arc second separation through a narrow band filter at the Cassegrain focus of ...
  • Telescope drive requirements and design of a Microcontroller based drive and display system 
    Chinnappan, V (Indian Institute of Astrophysics, Bangalore, 1993)
    Optical telescope is a precision instrument which gives images of stars and galaxies when the telescope is pointed towards them. To design a good telescope drive, the requirements of a good telescope is to be well defined. ...

Search DSpace

Browse

My Account