Asian Journal of Physics Vol. 33, No 12 (2024) 755-764

Research activities in optical metrology at IIT Madras (India) during 1971-2000

R S Sirohi
Former Director, Indian Institute of Technology Delhi;
Hauz Khas, New Delhi-110 016, India

Dedicated to Prof (Dr) Daniel Malacara-Hernández


Some of the research activities carried out by the Author and his group during 1971-2000 at the Applied Optics Laboratory, IIT Madras (India) have been described. These include improved collimation testing methods, measurement of long radii of curvature and focal length, multiplexing in speckle interferometry, measurement of displacement, slope and curvature using ESPI/DSPI and many more other measurements. © Anita Publications. All rights reserved.
Doi: 10.54955.AJP.33.12.2024.755-764
Keywords: Collimation, Radius of curvature, Focal length, Speckle metrology, Shearography, Talbot phenomenon.


Peer Review Information
Method: Single- anonymous; Screened for Plagiarism? Yes
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References

  1. Malacara Daniel, Optical Shop Testing, Wiley-Interscience, 3rd Edition, (2007)
  2. Sirohi R S, Kothiyal M P, Double wedge plate shearing interferometer for collimation test, Appl Opt, 26(1987) 4054-4056.
  3. Kothiyal Mahendra P, Sirohi Rajpal S, Improved collimation testing using Talbot interferometry, Appl Opt, 26 (1987)4056–4057.
  4. Kothiyal M P, Sirohi R S, Rosenbruch K-J, Improved techniques on collimation testing, Opt LaserTechnol, 20 (1988)139–144.
  5. Sriram K V, Kothiyal M P, Sirohi R S, Self referencing collimation testing techniques, Opt Eng, 32(1993)94–100.
  6. Sriram K V, Senthilkumaran P, Kothiyal M P, Sirohi R S, Double wedge plate interferometer for collimation testing – new configurations, Appl Opt, 32(1993)4199–4203.
  7. Sriram K V, Kothiyal M P, Sirohi R S, Collimation testing with linear dual-field, spiral and evolute gratings: A comparative study, Appl Opt, 33(1994)7258–7260.
  8. Darlin J S, Kothiyal M P, Sirohi R S, A phase-conjugate Twyman-Green interferometer with increased sensitivity for laser beam collimation, J Mod Opt, 45(1998)2371–2378.
  9. Sriram K V, Kothiyal M P, Sirohi R S, Curvature and focal length measurements using compensation of a collimated beam, Opt Laser Technol, 23(1991)241–245.
  10. Sriram K V, Kothiyal M P, Sirohi R S, Talbot interferometry in non-collimated illumination for curvature and focal length measurement, Appl Opt, 31(1992)75–79.
  11. Sriram K V, Kothiyal M P, Sirohi R S, Direct determination of focal length by using Talbot interferometry, Appl Opt, 31(1992)59845987.
  12. Sriram K V, Kothiyal M P, Sirohi R S, Use of a non-collimated beam for determining the focal length of a lens by Talbot interferometry, J Opt (India), 22(1993)61–66.
  13. Leendenz J A, interferometric displacement measurement on scattering surfaces utilizing speckle effect, J Phys E: Sci lustrum, 4(1970)214–218.
  14. Duffy D E, Moiré gauging of in-plane displacement using double aperture, Appl Opt, 11(1972)1778–1781.
  15. Joenathan C, Mohanty R K, Sirohi R S, Multiplexing in speckle shear interferometry, Opt Acta, 31(1984)681–692.
  16. Joenathan C, Mohanty R K, Sirohi R S, On the methods of multiplexing in speckle shear interferometry, Optik, 69(1984)8–12.
  17. Mohanty R K, Joenathan C, Sirohi R S, Multiplexing in speckle shear interferometry: An optimal method, Appl Opt, 24(1985)2043–2044.
  18. Joenathan C, Sirohi R S, Multiplexing in Speckle interferometry: Some methods, J Opt (India), 15(1986) 39–47.
  19. Mohanty R K, Joenathan C, Sirohi R S, Speckle and speckle shear interferometers combined for the simultaneous determination of out-of-plane displacement and slope, Appl Opt, 24(1985)3106–3109.
  20. Sharma D K, Krishna Mohan N, Sirohi R S, A holographic speckle shearing technique for the measurement of out-of-plane displacement, slope and curvature, Opt Commun, 57(1986)230–235.
  21. Krishna Mohan N, Masalkar P J, Murukeshan V M, Sirohi R S, Separation of influence of in-plane displacement component in multi-aperture speckle shear interferometry, Opt Eng, 33(1994)1973–1982.
  22. Joenathan C, Mohanty R K, Sirohi R S, Hololens in speckle and speckle shear interferometry, Appl Opt, 24(1985) 1294–1298.
  23. Joenathan C, Sirohi R S, Holographic gratings in speckle shearing interferometry, Appl Opt, 24(1985)2750–2751.
  24. Santhanakrishnan T, Krishna Mohan N, Palanisamy P K, Sirohi R S, Various speckle interferometric configurations for contouring and slope change measurement, J Instrum Soc India, 27(1997)16–22.
  25. Santhanakrishnan T, Palanisamy P K, Sirohi R S, Optical configuration in speckle shear interferometry for slope change contouring with a two-fold increase in sensitivity, Appl Opt, 37(1998)3447–3449.
  26. Ganesan A R, Joenathan C, Sirohi R S, Sharpening of fringes in digital speckle pattern interferometry, Appl Opt, 27(1988)2099–2100.
  27. Mohanty R K, Joenathan C, Sirohi R S, Speckle fringe sharpening in speckle shear interferometry, J Opt (India), 13(1984)49–51.
  28. Ganesan A R, Tan B C, Sirohi R S, Tilt measurement using Digital Speckle Pattern Interferometry, Opt Laser Technol, 24(1992)257–261.
  29. Sirohi R S, Tay C J, Shang H M, Boo W P, Nondestructive assessment of thinning of plates using digital shearography, Opt Eng, 38(1999)1582–1585.
  30. Murukeshan V M, Ganesan A R, Sirohi R S, Curvature measurement using double shear TV holography, Optik 110(1999)57–60.
  31. Sirohi R S, Optical Methods in Non-Destructive Testing, J Non-Destructive Evaluation, 20(2000)34–40.
  32. Krishna Mohan N, Saldner H O, Molin N E, Recent application of TV holography and shearography, Proc SPIE, 2861(1996)248–256.