Journal of Optics

, Volume 47, Issue 3, pp 380–388 | Cite as

Experimental measurement of range of wind speed using phase plate and Shack–Hartmann wave-front sensor

  • Satya Ranjan Behera
  • B. Raghavendra Prasad
Research Article


Himalayan Chandra Telescope (HCT) is a 2-m class telescope located at Indian Astronomical observatory (IAO), Hanle, Jammu and Kashmir. It is one of the world’s highest observatories and is suitable for optical and infrared regions. Atmospheric turbulence plays a vital role deciding the seeing condition of an observatory. The atmospheric turbulance at IAO is simulated using a phase plate in an laboratory adaptive optical system. Wave-fronts are generated by the rotating phase plate and sensed using a Shack–Hartmann wavefront sensor (SHWS). Cross-correlation coefficients between the first wave-front and subsequent wave-fronts reduce as speed of phase plate increases. The range of phase plate speed where wave-front can be safely reconstructed are found with corresponding wind speed. Varying exposure times over which wind speed can be measured are also calculated.


Phase plate Shack Hartmann wavefront sensor Adaptive optics 


  1. 1.
    J.W. Hardy, Adaptive Optics for Astronomical Telescopes (Oxord University Press, New York, 1998)Google Scholar
  2. 2.
    J. Porter, H.M. Queener, J.E. Lin, K. Thorn, Adaptive Optics for Vision Science Principles, Practices, Design, and Applications (Wiley, New Jersey, 2006)CrossRefGoogle Scholar
  3. 3.
    R. Tyson, Principles of Adaptive Optics (CRC Press, Charlotte, 2011)Google Scholar
  4. 4.
    D.J. Butler, E. Marchetti, J. Bahr, Phase screens for astronomical multi-conjugate adaptice optics: applixcation to MAPS, in Proc SPIE, 2003Google Scholar
  5. 5.
    P.M. Birch, J. Gourlay, N.P. Doble, Real time adaptive optics correction with a ferroelectric liquid crystal spatial light modulator and Shack-Hartmann wavefront sensor, in Proc SPIE, 1997Google Scholar
  6. 6.
    T.A. Rhoadarmer, J.R. Angel, Low-cost broadband static phase for generating atmospheric like turbulence. Appl. Opt. 40, 2946–2955 (2001)ADSCrossRefGoogle Scholar
  7. 7.
    R. Navarro, E. Moreno-Barriuso, Phase plates for wave-aberration compensation in the human eye. Opt. Let 25, 236–238 (2000)ADSCrossRefGoogle Scholar
  8. 8.
    C.S. Stalin, D.K. Sahu, G.C. Anupama, B.C. Bhatt, P.S. Parihar, T.P. Prabhu, Night sky at the Indian Astronomical Observatory during 2000–2008. Bull. Astr. Soc. India 00, 000 (2008)Google Scholar
  9. 9.
    T.P. Prabhu, Indian Astronomical Observatory Leh-Hanle, in Proc. Indian Natn Sci Academic, 2014Google Scholar
  10. 10.
    M.B. Roopashree, V. Ankodi, B.R. Prasad, A novel model of influence function: calibration of a continuous membrane deformable mirror, in ACEEE Int. J. on Control System and Instrumentation, vol. 03, no. 02, 2012Google Scholar
  11. 11.
    M.B. Roopashree, V. Ankodi, B.R. Prasad, Wind speed measurement from Shack Hartmann wavefront sensor data: an experimental review of cross-correlation peak detection, in Int. J. on Recent Trends in Engineering and Technology, vol. 6, no. 2, 2011Google Scholar
  12. 12.
    A. Vyas, M.B. Roopashree, B.R. Prasad, Intensity weighted noise reduction in MEMS based deformable mirror images, in AIP Conf Proceeding, 2011Google Scholar
  13. 13.
    T.I. Wang, G.R. Ochs, R.S. Lawrence, Wind measurements by the temporal cross-correlation of the optical scintillations. Appl. Opt. 20(23), 4073–4081 (1981)ADSCrossRefGoogle Scholar

Copyright information

© The Optical Society of India 2018

Authors and Affiliations

  1. 1.Indian Institute of AstrophysicsBangaloreIndia

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