Research Publications

     1985

1. N. Krishna Mohan and D.K. Sharma.
   An alternative technique for extraction of in-plane displacement from an image plane Hologram.
   Optics Communication. 56, 83-86 (1985).
   
   
   1986
   
   
2. D.K. Sharma, N. Krishna Mohan and R.S.Sirohi,
   A holographic speckle shearing technique for the measurement of out-of-plane displacement, slope and curvature
   Optics Communication, 57, 230-235 (1986).
   
   
   1987
   
   
3. N. Krishna Mohan, C.Joenathan, D.K.Sharma and R.S.Sirohi
   Applications of multi-aperture white light speckle photography
   Optik, 76, 7-11 (1987).
   
   
4. N.Krishna Mohan, C. Joenathan and R.S. Sirohi,
   Narrow slit aperture white light speckle photography for NDT
   Optics Communication, 64, 229-233 (1987).
   
   
   1988
   
   
5. D.K. Sharma, N. Krishna Mohan, and C. Delisle
   Real time holospeckle shear interferometry
   Optics Communication, 65, 70-72 (1988).
   
   
6. N. Krishna Mohan, C. Joenathan and R.S. Sirohi
   Investigations on multi-aperture white light speckle photography
   Optics Communication, 67, 27-33 (1988).
   
   
   1990
   
   
7. N. Krishna Mohan, D.K. Sharma and R.S. Sirohi
   Determination of longitudinal displacement using white light speckle photography
   Optics Communication, 78, 222-226 (1990).
   
   
8. N.Krishna Mohan
   White light speckle metrology
   Fourth Tropical College on Applied Physics: Lasers and Plasma Physics,
   Kuala Lumpur, Malaysia (June 1990).
   
   
   1991
   
   
9. Applications of white light speckle photography
   92nd DGaO conference held at Universität Oldenburg, Oldenburg,
   Germany (May 1991).
   
   
   1992
   
   
10. R.S.Sirohi and N.Krishna Mohan
    Speckle interferometry for deformation measurement
    J. Modern Optics, 39, 1293-1300 (1992).
    
    
11. N.Krishna Mohan, P.J.Masalkar and R.S.Sirohi
    Electronic speckle pattern interferometry with holo-optical element.
    Proceedings of SPIE conference in Industrial Applications of Optical
    Inspection and Metrology, Boston, Massachusetts, USA.
    SPIE Vol. 1821, pp. 234-242 (1992).
    
    
    1993
    
    
12. R.S.Sirohi and N.Krishna Mohan,
    In-plane sensitive configuration with two-fold sensitivity
    Applied Optics, 32, 6387-6390,(1993).
    
    
13. N.Krishna Mohan, H.O. Saldner and N-E.Molin,
    Electronic speckle pattern interferometry for simultaneous measurement of out-of-plane displacement and slope
    Optics Letters, 18,1861-1863 (1993).
    
    
    1994
    
    
14. N.Krishna Mohan and R.S.Sirohi
    Electronic speckle pattern interferometry with conventional and holo optical elements
    Journal of Optics, 23,13 -27 (1994).
    
    
15. N.Krishna Mohan, P.J.Masalkar, V.M.Murukeshan and R.S.Sirohi
    Separation of the influence of in-plane displacement in multi-aperture speckle shear interferometry,
    Optical Engineering, 33,1973-1982 (1994).
    
    
16. H.O.Saldner, N-E.Molin and N.Krishna Mohan
    Simultaneous measurement of out-of-plane displacement and slope by electronic holo-shearography
    Proceeedings of. SEM Conference on Experimental Mechanics ,Lisbon, Portugal,
    pp. 337-341(1994).
    
    
17. P.R.Sreedhar, N.Krishna Mohan and R.S.Sirohi
    Deformation studies with BaTiO3 crystal as recording medium.
    Proceedings of SPIE:Interferometry '94, Warsaw, Poland,
    SPIE Vol. 2340 pp. 40-49 (1994).
    
    
18. P.R.Sreedhar, N.Krishna Mohan and R.S.Sirohi
    Real time speckle photography using two wave mixing in BaTiO3 crystal
    Optical Engineering, 33, 1989-1995 (1994).
    
    
19. N.Krishna Mohan, H.O. Saldner and N-E.Molin,
    Electronic shearography applied to static and vibration objects.
    Optical Communications, 108, 197-202 (1994).
    
    
    
    1995
    
    
20. H.O. Saldner, N.Krishna Mohan and N-E.Molin,
    Comparative TV holography for vibration analysis.
    Optical Engineering, 34,486-492 (1995).
    
    
21. R.S.Sirohi and N.Krishna Mohan
    Role of lens aperturing in speckle metrology
    Journal of Scientific Industrial Research, 54,67-74 (1995).
    
    
22. P.R.Sreedhar, N.Krishna Mohan and R.S.Sirohi
    Time evolution of fringes obtained with a two-beam coupled photorefractive novelty filter
    Journal of.Optics, 24, 15-22 (1995).
    
    
23. T.Santhanakrishnan, N.Krishna Mohan, M.P.Kothiyal and R.S.Sirohi
    A non-contact simultaneous measurement of out-of-plane displacement and tilt of a cantilever using a quadrant detector
    Journal of Optics, 24,109-112 (1995).
    
    
    1996
    
    
24. N.Krishna Mohan and R.S.Sirohi
    Fringe formation in multiaperture speckle shear interferometry
    Applied Optics, 35,1617-1622 (1996).
    
    
25. N.Krishna Mohan, T.Santhanakrishnan, P.Senthilkumaran and R.S.Sirohi
    Simultaneous implementation of Leendertz and Duffy's methods for in-plane
    displacement measurement
    Optics Communication, 124, 235-239 (1996).
    
    
26. N.Krishna Mohan
    TV holography and Shearography in Engineering Metrology
    Proceedings of the International Workshop on Emergent Technologies for Instrumentation and measurement (ETIM’96), Como, Italy
    pp 103-110 (1996).
    
    
27. N. Krishna Mohan, H.O.Saldner and N.-E.Molin,
    Combined phase stepping and sinusoidal phase modulation applied to desensitized TV holography
    Journal of Measurement Science & Technology, 7, 712-715 (1996).
    
    
28. N.Krishna Mohan, H.O.Saldner and N.-E.Molin
    Recent applications of TV holography and shearography
    Proceedings of SPIE conference: Laser Interferometry VIII:
    Applications, Denver, Colorado, USA:
    SPIE Vol. 2861, 248-256 (1996).
    
    
29. T.Santhanakrishnan, N.Krishna Mohan, P.Senthilkumaran and R.S.Sirohi
    Multiaperture speckle interferometry for deformation measurement
    Journal of .Optics, 25, 81-91 (1996).
    
    
30. H.O.Saldner,N.-E.Molin and N.Krishna Mohan,
    Desensitized TV holography applied to static and vibrating objects for large deformation measurement.
    Proceedings of SPIE conference: Laser Interferometry VIII: Techniques and Analysis, Denver, Colorado, USA
    SPIE Vol. 2860, pp. 342-349 (1996).
    
    
31. T.Santhanakrishnan, N.Krishna Mohan and R.S.Sirohi
    New simple ESPI configuration for deformation studies on large structures based on diffuse reference beam
    Proceedings of SPIE conference: Laser Interferometry VIII:
    Applications, Denver, Colorado, USA:
    SPIE Vol. 2861, 257-263 (1996).
    
    
32. T.Santhanakrishnan, N. Krishna Mohan, P.Senthilkumaran and R.S.Sirohi
    Slope change contouring for 3-D deeply curved objects by multi-aperture speckle shear interferometry
    Optik , 104, 27-31 (1996).
    
    
33. R.S.Sirohi, N. Krishna Mohan and T.Santhanakrishnan
    Optical Configuration for measurement in speckle interferometry
    Optics Letters., 21, 1958-59 (1996).
    
    
    1997
    
    
34. N.Krishna Mohan and R.S.Sirohi
    Fringe formation in symmetric three aperture speckle shear Interferometry: An analysis
    Optics & Laser in Engineering, 26, 437-447 (1997).
    
    
35. P.R.Sreedhar, N.Krishna Mohan and R.S.Sirohi
    Displacement and slope measurements using image plane holography with BaTiO3 crystal
    Optics and Laser Technology, 29, 111-115 (1997).
    
    
36. T.Santhanakrishnan, N.Krishna Mohan and R.S.Sirohi
    Oblique observation speckle shear interferometry for slope change contouring
    J. Modern Optics, 44, 831-839 (1997).
    
    
37. T.Santhanakrishnan, N. Krishna Mohan, P.K.Palanisamy and R.S.Sirohi
    Various speckle interferometric configurations for contouring and slope change measurement
    Journal of Instrumentation, 27,16-22 (1997).
    
    
38. R.S.Sirohi and N.Krishna Mohan
    An in-plane insensitive multiaperture speckle shear interferometer for slope measurement
    Optics & Laser Technology, 29, 415-417 (1997).
    
    
    1998
    
    
39. N.Krishna Mohan, J.S.Darlin, Majles M.Ara, M.P.Kothiyal and R.S.Sirohi
    Speckle Photography with BaTiO3 crystal for the measurement of in-plane displacement field distribution of distant objects
    Optics & Laser in Engineering, 29,211-216 (1998).
    
    
40. M.H.Majles Ara, C.Vijayan, N.Krishna Mohan, M.P.Kothiyal and R.S.Sirohi
    Experimental Characterisation of Photorefractive beam coupling for BaTiO3 Crystal at Multiple wavelengths
    Proceedings of International Conference on Optics & Optoelectronics, Dehradun, India. December 2-6,
    Vol.2, pp. 932-935 (1998).
    *Also appeared in selected papers from ICO: SPIE Proceedings,
    SPIE Vol 3729 pp 182-185 (April 1999).
    
    
41. M.H.Majles Ara, C.Vijayan, N. Krishna Mohan, M.P.Kothiyal and R.S.Sirohi
    Photorefractive Non linearity in BaTiO3:Fe and BaTiO3 :Ce at Multiple Wavelengths
    Proceedings of International Conference on Fiber Optics and Photonics, I.I.T New Delhi, India, December 16-18,
    Vol.3, pp 816-819 (1998).
    
    
42. T.Santhanakrishnan P.K Palanisamy, N. Krishna Mohan, R.S.Sirohi
    A new optical configuration in speckle interferometry for contouring of three-dimensional objects,
    Optics Communication, 152, 19-22 (1998).
    
    
43. M.H.Majles Ara, C.Vijayan, N. Krishna Mohan and R.S.Sirohi
    Dependence of Diffraction Efficiency of Photorefractive Gratings on Crystal Orientation in BaTiO3:Fe at Multiple Wavelengths.
    Proceedings of National Laser Symposium, I.I.T. Kanpur, December 14-16 pp. 147-148(1998).
    
    
44. M. H.Majles Ara, N. Krishna Mohan, M. P. Kothiyal, and R. S. Sirohi
    Real-time speckle shear photography using BaTiO3 crystal as a recording medium or in-plane strain measurement.
    LiSLO 99,Malaysia (1998).
    
    
45. M.H.Majles Ara, C.Vijayan, N.Krishna Mohan and R.S.Sirohi
    Evaluation of photorefractive beam coupling characteristics of GaAs:Cr and InP:Fe Crystals
    8th Europhysical Conference on Defects in Insulating Materials
    (EURODIM 98), 6-11 July 1998, Keele University, London, U.K.
    
    
46. S.Suja Helen, M.H.Majles Ara, J.S.Darlin, N.Krishna Mohan, M.P.Kothiyal and R.S.Sirohi
    Phase Step Calibration and Phase Measurement in Image Plane Holography using BaTiO3 crystal as recording medium
    Optical Engineering, 37, 2918-2925 (1998).
    
    
    1999
    
    
47. N. Krishna Mohan,
    Measurement of in-plane displacement with twofold sensitivity using
    phase reversal technique
    Optical Engineering, 38, 1964-1966 (1999).
    
    
48. N.Krishna Mohan
    An optical configuration in multi-aperture speckle interferometry for simultaneous measurement of in-plane and out-of plane deformation
    Journal of Instrumentation, 29, 147-151(1999).
    
    
49. N.Krishna Mohan
    Double and multiple-exposure methods in multi-aperture speckle shear interferometry for slope and curvature measurement
    Proceedings of Laser Metrology for Precision Measurement and Inspection in Industry, Brazil.Module 4, Holography and Speckle Techniques, pp 4.87-4.98, (1999).
    
    
50. T.Santhanakrishnan., P.K. Palanisamy, N. Krishna Mohan, R.S.Sirohi
    A modified in-line speckle interferometric configuration for contouring of three dimensional objects
    Optik, 110,181-183(1999).
    
    
51. M.H.Majles Ara, C.Vijayan, N.Krishna Mohan and R.S.Sirohi
    Real-time speckle shear photography using BaTiO3 crystal for in-plane strain and displacement measurements at multiple wavelengths.
    SPIE conference Photorefractive fibre and crystal devices; Materials, Optical properties, and Applications V, Denver (USA),
    SPIE Vol. 3801. pp 180-189 (1999).
    
    
52. V.Venkateswara Rao and N.Krishna Mohan
    Real-time image subtraction using Phase reversal technique
    SPIE conference Optical Diagnostics for Fluids/Heat/Combustion
    and Photomechanics for Solids, Denver (USA)
    SPIE Vol. 3783: p. 288-293 (1999).
    
    
53. M.H.Majles Ara, C.Vijayan, N. Krishna Mohan and R.S.Sirohi
    Estimation of diffraction efficiency of holographic gratings in photorefractive BaTiO3 and BaTiO3:Ce at Multiple Wavelengths
    Optik, 110,383-388(1999).
    
    
    2000
    
    
54. N. Krishna Mohan*, A.Andersson, M. Sjödahl and N.-E.Molin
    Fringe formation in a dual beam illumination - observation TV holography:An analysis
    SPIE 4101A: Laser Interferometry X: Techniques and Analysis,
    San Diego, USA, p. 204-214 (2000).
    *Awarded Best Outstanding Poster Paper at the Laser Interferometry International Conference.
    
    
55. N. Krishna Mohan, A.Andersson, M. Sjödahl and N.-E.Molin
    Optical configuration for TV holography measurement of in-plane and out-of-plane deformations
    Applied Optics, 39, 573-577 (2000).
    
    
56. H.Majles Ara, C.Vijayan, N. Krishna Mohan and R.S.Sirohi
    Parametric study of photorefractive beam-coupling in BaTiO3 at multiple wavelengths
    Optical Engineering, 39, 535-540 (2000).
    
    
57. A.Andersson, N. Krishna Mohan, M. Sjödahl and N.-E.Molin
    TV shearography: Quantitative Measurement of shear magnitudes using digital speckle photography
    Applied Optic, 39, 2565-2568 (2000).
    
    
58. N. Krishna Mohan, A.Andersson, M. Sjödahl and N.-E.Molin
    Optical configurations in TV holography for deformation and shape measurement
    Lasers in Engineering, 10, 147-159 (2000).
    
    
59. N.Krishna Mohan
    Phase reversal speckle shear interferometry for strain measurement
    EOS/SPIE Symposium on Applied Photonics, 22-24 May 2000, Glasgow, Scotland.220-225(2000).
    
    
60. N. Krishna Mohan
    The influence of multiple-exposure recording on curvature pattern
    using multi-aperture speckle shear interferometry
    Optics Communication, 186(4-6), 259-263(2000).
    
    
61. N. Krishna Mohan, A.Andersson, M. Sjödahl and N.-E.Molin
    The Design and Application of a Stereovision TV Holography System
    for In-plane displacement and Shape measurement
    International Conference on Fiber Optics and Photonics (Photonics- 2000), Vol.2
    held at Calcutta, India. pp. 792-794, 18-21st Dec.2000.
    
    
    2001
    
    
62. N. Krishna Mohan, A.Andersson, M. Sjödahl and N.-E.Molin
    Dual beam symmetric illumination -observation TV holography system for measurements
    Optical Engineering ,40,12, 2780-2787(2001).
    
    
63. N. Krishna Mohan, V. Venkateswara Rao, P. Shalima and
    T.V. Chandra Sekhar
    A new technique for phase introduction in a two-beam interferometer for amplitude image subtraction.
    Journal of Optics. 30, 95-101 (2001).
    
    
64. N. Krishna Mohan, Rekha Mathews and V. Venkateswara Rao
    Real-time speckle photography with phase reversal technique using BaTiO3 crystal as a recording medium
    SPIE Conference (No. 4448): Optical Diagnostics for Fluids/Heat/Combustion
    and Photo-mechanics for Solids, San Deigo (2001).
    
    
65. N. Krishna Mohan
    Development of a phase (contrast) reversal speckle interferometric system for in-plane displacement measurement with twofold sensitivity
    Proc. SPIE 4564, Opto-mechatronic systems II, Hyung S.Cho, Ed pp 135-145 (2001).
    
    
    2002
    
    
66. V.Venkateswara Rao and N.Krishna Mohan
    Optical image processing phase reversal Twyman-Green Interferometer
    AeroSense 2002, Visual Information Processing XI; Zia-ur Rahman, Robert A. Schowengerdt, Stephen E. Reichenbach; Eds.Orlando, Florida (USA).
    Proc. SPIE 4736, 184-188 (2002).
    
    
67. N. Krishna Mohan and P.K. Rastogi
    Phase shifting whole field speckle photography technique for the measurement of object deformations in real time
    Optics Letters, 27, 8, 565-567 (2002).
    
    
    2003
    
    
68. N. Krishna Mohan and P.K. Rastogi
    Phase shift Calibration in Speckle Photography
    – A First Step to Practical Real Time Analysis of Speckle Correlation Fringes
    Journal of Modern Optics ,50,1183-1188(2003).
    
    
69. N. Krishna Mohan and P.K. Rastogi
    Recent developments in digital speckle pattern interferometry - Guest Editorial
    Optics Lasers in Engineering, 40, 439-445 (2003).
    
    
70. N. Krishna Mohan and Rekha Mathews
    Photorefractive phase reversal speckle photography for evaluation of in-plane displacement
    Lasers in Engineering, (2004).
    
    
    

Presented at the National Conferences:

1. N.Krishna Mohan, C.Dhanasekharan and M.Mukunda Rao
   Effect of Atmospheric Turbulance on an Open Air Laser Communication Link.
   All India Conference on Lasers and Laser Systems Held at IISc, Bangalore, India, (October 1976).
   
   
2. N.Krishna Mohan,T.A.Prasada Rao,M.P.Kothiyal and R.S.Sirohi
   Design and Fabrication of a Nitrogen Laser
   Tenth Symposium on Optics Held at IIT, Madras, India (January 1982).
   
   
3. D.K.Sharma, N.Krishna Mohan and R.S.Sirohi
   A holographic speckle shearing technique for the measurement of out-of-plane displacement, slope and curvature
   Thirteenth symposium on Optics held at NPL, New Delhi (January 1985).
   
   
4. N.Krishna Mohan, D.K.Sharma and R.S.Sirohi
   A new technique for measurement of in-plane displacement from image plane holograms
   Thirteenth symposium on Optics held at NPL, New Delhi (January 1985).
   
   
5. N.Krishna Mohan, D.K.Sharma and R.S.Sirohi
   Multiple aperture white light speckle interferometry for measuring strain, deformation and surface contours.
   XIV symposium on Optics held at IRDE, Dehradun (March 1986).
   
   
6. N.Krishna Mohan and R.S.Sirohi
   White light speckle annemometry,
   Symposium on Optics held at IAP, Bangalore (1991).
   
   
7. N.Krishna Mohan and R.S.Sirohi
   Electronic speckle pattern interferometry.
   Seminar on Holography and Fiber Optics, Madras, India, 11-12 January 1993.
   
   
8. P.R.Sreedhar, N.Krishna Mohan and R.S.Sirohi
   Time evaluation of fringes obtained with a two-beam coupled photorefractive novelty filter
   XXI National Symposium on Optics held at IIT Madras, 10-12 February 1994.
   
   
9. T.Santhanakrishnan, N.Krishna Mohan, M.P.Kothiyal and R.S.Sirohi
   A non-contact simultaneous measurement of out-of-plane displacement and tilt using a quadrant detector
   XI National Symposium on Optics held at IIT Madras, 10-12 February 1994.
   
   
10. T.Santhanakrishnan, N.Krishna Mohan, P.Senthilkumaran
    P.K.Palanisamy and R.S.Sirohi
    Multiaperture speckle interferometry for deformation measurement
    XXII National Sym/posium on Optical and Opto-Electronic
    Instrumentation held at CSIO Chandigarh,29-31 March 1995.
    
    
11. P.R.Sreedhar, P.Senthilkumaran, N.Krishna Mohan and R.S.Sirohi
    Real-Time image plane holography with BaTiO3 crystal
    XXII National Symposium on Optical and Opto-Electronic
    Instrumentation held at CSIO Chandigarh,29-31 March 1995.
    
    
12. T.Santhanakrishnan, N.Krishna Mohan, P.K.Palanisamy and R.S.Sirohi
    Measurement of slope changes of a curved object using multi-aperture speckle shear interferometry
    XXIII National Sym/posium on Optics held at IRDE, Dehradun
    14-16, March 1996.
    
    
13. T.Santhanakrishnan , N.Krishna Mohan, P.K.Palanisamy and R.S.Sirohi
    Various speckle interferometric configurations for contouring and slope change measurement
    Proceedings International Conference on Instrumentation(ICI-1996) held at IISc Bangalore, 8-10,August 1996.
    
    
14. T.Santhanakrishnan, N.Krishna Mohan and R.S.Sirohi
    Two novel configurations for in-plane displacement measurement in speckle interferometry
    XXIV National Symposium on Optics held at Calcutta, 14-16, February 1997.
    
    
15. M.H.Majles Ara, C.Vijayan, N.Krishna Mohan and R.S.Sirohi
    Estimation of Figure of Merit Parameters for Photorefractive Beam Coupling in Some Ferroelectric and Semiconducting Crystals.
    Tenth National Seminar on Ferroelectics and Dielectics,
    I.I.T. Madras, December 16-18 pp.59 (1998).
    
    
16. Rekha Mathew, N. Krishna Mohan and V. Venkateswara Rao
    Real-time phase reversal speckle photography using BaTiO3 crystal
    as the recording medium.
    National Seminar on Opto-Electronics SPENDE 2001
    University of Kerala , Kariavattom,Thiruvananthapuram
    May 25-26 (2001).

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Dr. Nandigana Krishna Mohan, Department of Physics, IITM, Chennai - 36.