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Browsing by Author "Vyas, A"

Browsing by Author "Vyas, A"

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  • Progressive prediction of turbulence using wave-front sensor data in adaptive optics using data mining 
    Vyas, A; Roopashree, M. B; Prasad, B. R (Macmillan Publishers India Ltd., 2009)
    Nullifying the servo bandwidth errors improves the strehl ratio by a substantial quantity in adaptive optics systems. An effective method for predicting atmospheric turbulence to reduce servo bandwidth errors in real time ...
  • Real-time wind speed measurement using wavefront sensor data 
    Roopashree, M. B; Vyas, A; Prasad, B. R (SPIE-The International Society for Optical Engineering, 2010-02)
    Real-time measurement of effective wind speed helps in continuous monitoring of the temporal bandwidth in adaptive optics systems. In this paper, we propose a simple and efficient method for estimating wind speed from ...
  • Spatial light modulator for wave-front correction 
    Vyas, A; Roopashree, M. B; Banyal, R. K; Prasad, B. R (Department of Applied Optics and photonics, University of Calcutta, 2009)
    We present a liquid crystal method of correcting the phase of an aberrated wave-front using a spatial light modulator. A simple and efficient lab model has been demonstrated for wave-front correction. The crux of a wave-front ...
  • Towards Low Cost turbulence generator for AO testing: Utility, control and stability 
    Roopashree, M. B; Vyas, A; Krishnan, S. M; Sriram, R; Siva Shankar Sai, S; Prasad, B. R (Optical Society of America, 2011-07)
    We demonstrate and characterize an effective, statistically repeatable atmospheric turbulence generator with the aim of testing a 2m class telescope adaptive optics system in a cost effective manner.
  • Wind speed measurement from Shack Hartmann Wavefront Sensor data: An experimental review of cross-correlation peak detection 
    Roopashree, M. B; Vyas, A; Prasad, B. R (ACEEE, USA, 2011)
    The mean velocity of the atmospheric wind is an important parameter in characterizing the turbulence above an astronomical telescope. Real-time wind velocity measurement is exceedingly essential to update the design metrics ...
  • X-ray attenuation coefficient of mixtures: Inputs for dual-energy CT 
    Haghighi, R. R; Chatterjee, S; Vyas, A; Pratik Kumar; Thulkar, S (American Association of Physicists in Medicine, 2011-10)
    The attenuation coefficient, μ(E) of substances, at any energy (E) of the x-ray photon, is known to depend on the electron density (ρe) and the effective atomic number (Zeff) of the material. While the dependence on ρe is ...

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