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Browsing by Author "Saxena, A. K"

Browsing by Author "Saxena, A. K"

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  • Large optical mirror making technology and facility at Indian Institute of Astrophysics 
    Saxena, A. K (SPIE-The International Society for Optical Engineering, 1990)
    Indian Institute of Astrophysics (IIA) has recently completed building of 2.34 MTelescopeS Optics for the same was fabricated in the Optical shop of the Institute. Thepaper describes the technology used in making 2.34 M ...
  • Low cost method for subarcsecond testing of a right angle prism 
    Saxena, A. K; Yeswanth, L (SPIE, 1990-12)
    This paper describes a method for testing a right angle prism, or any other optical component having a right angle, to subarcsecond accuracy. The method makes use of Haidinger fringes and is simple to use. Unlike autocollimation ...
  • 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 ...
  • Measurement of gradient index profiles by babinet fringe analysis 
    Pandya, T. P; Saxena, A. K (American Institute of Physics, 1979-03)
    A theory for determining one-dimensional ray deflections with the help of distorted Babinet fringes has been developed. An approach for investigating two-dimensional ray deflections has been presented. Applications of the ...
  • Multislit spectrophotometry of the corona 
    Saxena, A. K; Singh, J; Gabriel, F (Indian National Science Academy, 1981)
  • A New Polarimeter for Stellar Polarization Measurement 
    Saxena, A. K (International Astronomical Union, 1986)
    A polarimeter for the measurement of Stokes' parameters for stellar and quasi stellar objects in specific wavelength regions has been reported. The variable retardation and dispersive property of a small angle Babinet ...
  • Observations with the High Altitude GAmma Ray (HAGAR) telescope array in the Indian Himalayas 
    Britto, R. J; Acharya, B. S; Anupama, G. C; Bhatt, N; Bhattacharjee, P; Bhattacharya, S. S; Chitnis, V. R; Cowsik, R; Dorji, N; Duhan, S. K; Gothe, K. S; Kamath, P. U; Koul, R; Mahesh, P. K; Mitra, A; Nagesh, B. K; Parmar, N. K; Prabhu, T. P; Rannot, R. C; Rao, S. K; Saha, L; Saleem, F; Saxena, A. K; Sharma, S. K; Shukla, A; Singh, B. B; Srinivasan, R; Srinivasulu, G; Sudersanan, P. V; Tickoo, A. K; Tsewang, D; Upadhya, S; Vishwanath, P. R; Yadav, K. K (French Society of Astronomy and Astrophysics, 2010-12)
    For several decades, it was thought that astrophysical sources emit high energy photons within the energy range of the gamma-ray region of the lectromagnetic spectrum also. These photons originate from interactions of high ...
  • Observations with the High Altitude GAmma-Ray (HAGAR) telescope array in the Indian Himalayas 
    Britto, R. J; Acharya, B. S; Anupama, G. C; Bhatt, N; Bhattacharjee, P; Bhattacharya, S; Chitnis, V. R; Cowsik, R; Dorji, N; Duhan, S. K; Gothe, K. S; Kamath, P. U; Koul, R; Manoharan, J; Mahesh, P. K; Mitra, A; Nagesh, B. K; Parmar, N. K; Prabhu, T. P; Rannot, R. C; Rao, S. K; Saha, L; Saleem, F; Saxena, A. K; Sharma, S. K; Shukla, A; Singh, B. B; Srinivasan, R; Srinivasulu, G; Sudersanan, P. V; Tickoo, A. K; Tsewang, D; Upadhya, S. S; Vishwanath, P. R; Yadav, K. K (Copernicus Publications, 2011-11)
    The High Altitude GAmma-Ray (HAGAR) array is a wavefront sampling array of 7 telescopes, set-up at Hanle, at 4270 m amsl, in the Ladakh region of the Himalayas (Northern India). It constitutes the first phase of the HImalayan ...
  • Optical glass: its manufacture in India — a historical perspective 
    Saxena, A. K; Vagiswari, A; Manjula, M (Indian National Science Academy, 1991)
    A historical perspective of optical glass industry in India has been presented in this paper. In this introduction a clear definition and understanding of optical glass is given. This is followed by world perspective. The ...
  • Optical polishing for development of highly specular sunshield for radiant coolers of meteorological satellites of ISRO 
    Madhu Prasad; Saxena, A. K (Indian Space Research Organisation, ISRO Satellite Centre, 2010-01-22)
    Radiant cooler is used to cool the infrared and water vapour detectors of meteorological payload of several geosynchronous satellites of ISRO. A three stage cooler was developed at Thermal Systems Group, ISAC to achieve ...
  • Overview of the Instrument & Technology development at IIA (Past, Present, Future) 
    Saxena, A. K (Indian Institute of Astrophysics, 2010)
  • 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 10.5μm quantum well infrared photodetector for astronomical applications 
    Joseph, Celine; Saxena, A. K (Department of Applied Optics and Photonics, University of Calcutta, 2011)
  • A Program for Testing Aspheric Schmidt Corrector Plate 
    Saxena, A. K; Lancelot, J. P (Indian Institute of Astrophysics, Bangalore, 1987)
    A null test for testing aspheric Schmidt corrector plate has been described. This paper gives a detailed procedure and a computer programe for computing optimum test parameters. A typical run of the program for testing a ...
  • Quantitative test for concave aspheric surfaces using a Babinet compensator 
    Saxena, A. K (Optical Society of America, 1979)
    A quantitative test for the evaluation of surface figures of concave aspheric surfaces using a Babinet compen-sator is reported. A theoretical estimate of the sensitivity is 0.002X for a minimum detectable phase change of ...
  • Re-aluminization of 2M Himalayan Chandra Telescope primary mirror 
    Kemkar, P. M. M; Saxena, A. K; Nirmal Kumar, P. K; Ismail, R; Sagayanathan, K (Indian Institute of Astrophysics, 2011-12)
    The purpose of this document is to establish the general requirements for handling and coating of the primary and secondary mirror of 2M Himalayan Chandra Telescope (HCT) at the observatory Mirror Coating facility, Hanle. ...
  • Record of extended corona using colour video 
    Saxena, A. K; Samson, J. P. A; Lancelot, J. P (Indian Institute of Astrophysics, Bangalore, 1997)
    The entire event of the total solar eclipse of October 24 1995 was vediographed at our Kalpi camp. We have used SONY handy cam Video 8 Model No. CCD FX 280E PAL attached with 12x variable zoom lens. Partial eclipse was ...
  • Scheme of a quantum well infrared photodetector(QWIP) for astronomical application 
    Joseph, Celine; Tripathi, Brijesh; Saxena, A. K; Sircar, Ratna (2007-12)
  • Search for Hydrogen-alpha Emitting Cool Pockets in Corona During the Total Solar Eclipse of October 24, 1995 
    Cowsik, R; Singh, J; Raju, K. P; Saxena, A. K; Samson, J. P. A; Naidu, B. N (Indian Institute of Astrophysics, Bangalore, 1997)
    Narrow pass band hydrogen alpha filtergrams were obtained during totality at Kalpi, to look for cool pockets of H-alpha emission in corona first observed by Bappu and Bhattacharyya during the 1970 Mexican eclipse observations. ...
  • Short-period intensity oscillations in the solar corona observed during the total solar eclipse of 26 February 1998 
    Cowsik, R; Singh, J; Saxena, A. K; Srinivasan, R; Raveendran, A. V (Kluwer Academic Publishers, 1999-08)
    Encouraged by the detection of high-frequency, low-amplitude continuum intensity oscillations in the solar corona during the total solar eclipse of 1995, we designed and fabricated a six-channel photometer incorporating ...

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