# Pramod Rastogi

#### Professeur titulaire

pramod.rastogi@epfl.ch +41 21 69 32445 http://imacwww.epfl.ch/Team/Rastogi/rastogi.jsp

**EPFL ENAC IIC IMAC **

GC G1 527 (Bâtiment GC)

Station 18

CH-1015 Lausanne

## Biographie

He received his MSc degree from the University of Lucknow, MTech degree from the Indian Institute of Technology Delhi, and doctorate degree from the University of Franche Comté in France. His research activities are principally in the area of holographic interferometry, speckle metrology, fiber optics sensors, phase shifting and moiré. He is the author or coauthor of more than 175 scientific papers of which more than 140 are published in peer-reviewed archival journals. He is also the author of book chapters, Encyclopaedia articles, and has edited several books in the field of optical metrology. His guest-edited three special sections on Optics in Switzerland for Optical Engineering in 1995 are even today an invaluable source of reference relative to optical engineering activities in Switzerland both at the academic and industrial levels. He has guest-edited over a dozen special dedicated issues in archival journals.

He has also chaired and organized several international symposiums, such as, the International Conference on Applied Optical Metrology, Balatonfüred, Hungary, June 8-11, 1998; or the Conference on Trends in Optical Non-destructive Testing, Lugano, Switzerland, May 2-5, 2000, or the Conference on Advanced Phase Measurement Methods in Optics and Imaging, Monte Verita, Ascona, Switzerland, May 16-21, 2010 etc.

He is a Fellow of the Optical Society of America (1993) and a Fellow of the Society of the Photo-Optical Instrumentation Engineers (1995). He is also a recipient of the Hetényi Award for the most significant research paper published in Experimental Mechanics in the year 1982.

He was Elected as a Member of the Swiss Academy of Engineering Sciences (SATW) in 2014. He was recipient of the SPIE Dennis Gabor Award, 2014. The Dennis Gabor award is presented annually in recognition of outstanding accomplishments in diffractive wave front technologies, especially those which further the development of holography and metrology applications.

He was an honorary visiting Professor at the IIT Delhi between 1999 & 2003.

Since 2000 he has also been active in laying groundwork for collaboration with the Indian Institutes of science and technology. Between the years 2000 & 2004, he was doing this as a part of his broader activity as in-charge of relations with Asia. His initiatives have led to academic exchange programs involving faculty and students with a view to fostering networking, research linkages and partnerships. To cite a few of his many initiatives: his active contribution to the holding of a high level Indo Swiss Workshop on Science & Technology at Bangalore in 2003; the setting up of ISJRP - the pilot project on bilateral partnership in S&T between Switzerland and India - in 2004; developing ISBRI (Indo-Swiss bilateral research initiative) in 2006; etc. He remained as the main coordinator of the Indo-Swiss Joint Research Program between the period covering the program's inception in 2004 until February 2011. He is currently responsible for developing academic and institutional relations with the universities in India and South-East Asian countries.

He has been instrumental in helping to open up a range of opportunities to the EPFL students, such as, doing their "mobility" years at one of the IITs or, their final year major projects or internships at one of the Indian institutions/companies. Over a hundred EPFL students have benefited from these programs.

He was instrumental in establishing Internship program with the aim of promoting an awareness of EPFL among the IIT students. This program has become very popular among the IIT and IIITA students with several hundreds of them having benefited from this program.

He played a key role in the setting up of the EPFL-IIT Madras joint postgraduate course on "Technology and sustainable development" in 2000-01. He was the co-director of the last edition of the course which was held between January and April, 2008.

## Edited books

P.K. Rastogi and E. Hack, Phase Estimation in Optical Interferometry, CRC Press, London, 2014

P.K. Rastogi and E. Hack, Optical Methods for Solid Mechanics: A Full-Field Approach, Wiley, 2012

P.K. Rastogi, Digital Speckle Pattern Interferometry and Related Techniques, John Wiley & Sons, 2001

P.K. Rastogi and D. Inaudi, Trends in Optical Non-Destructive Testing and Inspection, Elsevier, 2000

P.K. Rastogi, Photomechanics, Topics in Applied Physics Series, Vol. 77, Springer-Verlag, 2000

P.K. Rastogi, Optical Measurement Techniques and Applications, Artech Book House, 1998

P.K. Rastogi, Holographic interferometry-Principles and Methods, Springer-Verlag, 1994

## Editor of archival journal

Co-Editor-in-Chief, International journal of

**Optics and Lasers in Engineering**, Elsevier, London (Since March 1999).

## Plenary Lectures (2010-2014)

Plenary Lecture: Simultaneous estimation of multiple phases in phase shifting holographic interferometry, International Conference on Optics & Optoelectronics, Dehradun, March 5-8, 2014.

Plenary Lecture: Simultaneous recovery of multiple components of deformations using temporal phase measurement interferometry, The International Symposium on Photonics and Optoelectronics(SOPO 2014), Suzhou, August 22-24, 2014. http://www.sopoconf.org/2014/

Plenary Lecture: Subspace based methods for phase estimation in interferometry, The International Symposium on Optomechatronic Technologies, Toronto, October 25-27, 2010. http://www.isot-2010.org/

Plenary Lecture: Simultaneous determination of two displacement components using temporal phase measurement interferometry International Conference on Advanced Technology in Experimental Mechanics 2011 (ATEM11), Kobe, September 19-21, 2011.

Plenary Lecture: Multidimensional deformation measurements using subspace based methods ISEM-ACEM-SEM-7th ISEM12- Taipei, November 8-11, 2012. http://www.2ndisem.tw/05.html

## PUBLICATIONS IN REFEREED JOURNALS (2003-2014)

**2014**

1. Kulkarni R., Rastogi P., ''Digital holographic moiré for the direct and simultaneous estimation of strain and slope fields'' Opt. Express, Vol. 22, 2014, pp. 23192-23201, 2014.

2. Kulkarni R., Rastogi P., ''Direct phase derivative estimation using difference equation modeling in holographic interferometry'' Journal of Optics, Vol. 16, 2014, pp. 105708, 2014.

3. Kulkarni R., Rastogi P., ''Simultaneous estimation of phase and phase derivative using a difference equation representation of the interference field'' J. Opt. Soc. Am. A, 31, pp. 1919-1922, 2014.

4. Kulkarni R., Rastogi P., ''Estimation of phase derivatives using discrete energy separation algorithm in digital holographic interferometry'' Optics Letters, 39, no. 13, pp. 3722-3724, 2014.

5. Kulkarni R., Rastogi P., ''Simultaneous measurement of in-plane and out-of-plane displacements using pseudo-Wigner-Hough transform'' Opt. Express, 22, pp. 8703-8711, 2014.

6. Kulkarni R., Gorthi S. S., Rastogi P., ''Measurement of in-plane and out-of-plane displacements and strains using digital holographic moiré'' Journal of Modern Optics, 61, no. 9, pp. 755-762, 2014.

**2013**

7. Rajshekhar G., Rastogi P., '' Phase estimation using a state-space approach based method'' Optics and Lasers in Engineering, 51(8), pp. 1004-1007, 2013.

8. Kulkarni R., Rastogi P., ''Multiple phase estimation in digital holographic interferometry using product cubic phase function'' Optics and Lasers in Engineering, 51(10), pp. 1168-1172, 2013.

**2012**

9. G. Rajshekhar, S. S. Gorthi, and P. Rastogi, Estimation of multiple phases from a single fringe pattern in digital holographic interferometry, Optics Express, 20(2), 1281-1291, 2012.

10. . G. Rajshekhar, S. S. Gorthi, and P. Rastogi, Detection of defects from fringe patterns using a pseudo Wigner-Ville distribution based method, Optics and Lasers in Engineering, 50(8), 1059-1062, 2012.

11. G. Rajshekhar and P. Rastogi, Fringe analysis: Premise and perspectives, Optics and Lasers in Engineering, 50(8), iii-x, 2012.

**2011**

12. Rajshekhar, G., Gorthi, S. S. and Rastogi, P. ``Simultaneous measurement of in-plane and out-of-plane displacement derivatives using dual-wavelength digital holographic interferometry'', Applied Optics, 50(34), pp H16-H21, 2011.(http://infoscience.epfl.ch/record/168957)

13. Rajshekhar, G. and Rastogi, P. ``Application of complex-lag distributions for estimation of arbitrary order phase derivatives in digital holographic interferometry'' , Optics Letters, 36(19), pp 3738-3740, 2011. (http://infoscience.epfl.ch/record/168867)

14. Rajshekhar, G., Gorthi, S. S. and Rastogi, P. ``Simultaneous multidimensional deformation measurements using digital holographic moiré'' , Applied Optics, 50(21), pp 4189-4197, 2011. (http://infoscience.epfl.ch/record/167601)

15. Gorthi, S. S., Rajshekhar, G. and Rastogi, P., ``Three dimensional shape measurement using high-order instantaneous moments based fringe projection method'', Optics & Laser Technology, 43(1), pp 40-44, 2011. (http://infoscience.epfl.ch/record/166156)

16. Rajshekhar, G., Gorthi, S. S. and Rastogi, P. ``Estimation of dynamically varying displacement derivatives using fringe projection technique'', Applied Optics, 50(3), pp 282-286, 2011. (http://infoscience.epfl.ch/record/162259)

17. Iwaniuk, D., Rastogi, P. and Hack, E. ``Correcting spherical aberrations induced by an unknown medium through determination of its refractive index and thickness'', Optics Express, 19(20), pp. 19407-19414, 2011

**2010**

18. Iwaniuk, D., Hack, E. and Rastogi, P. ``Generation of a high depth of focus with constant transversal spot size using a phase-only pupil filter'', Journal of Modern Optics, 57 (21), pp 2141-2146, 2010

http://www.tandfonline.com/doi/abs/10.1080/09500340.2010.529516

19. Rajshekhar, G., Gorthi, S. S. and Rastogi, P. " Estimation of phase derivative using adaptive window spectrogram" Journal of Optical Society of America: A, 27:69-75, 2010.

20. Gorthi, S. S., Rajshekhar, G. and Rastogi, P. "Strain estimation in digital holographic interferometry using piecewise polynomial phase approximation based method" Optics Express, 18(2):560-565, 2010.

21. Gorthi, S. S. and Rastogi, P. "Fringe projection techniques: Whither we are?" Optics and Lasers in Engineering, 48(2):133-140, 2010.

22. Gorthi, S. S. and Rastogi, P. " Phase estimation in digital holographic interferometry using cubic phase function based method" Journal of Modern Optics, 57(7):595-600, 2010.

23. Gorthi, S. S., Rajshekhar, G. and Rastogi, P. "Three dimensional shape measurement using high-order instantaneous moments based fringe projection method " Optics and Lasers Technology, Article in Press, 2010.

24. Gorthi, S. S., Rajshekhar, G. and Rastogi, P. "Investigation to realize a computationally efficient implementation of the high-order instantaneous-moments-based fringe analysis method" Optical Engineering, Accepted, 2010.

**2009**

25. Gorthi, S. S. and Rastogi, P. "Simultaneous measurement of displacement strain and curvature in digital holographic interferometry using high- orderinstantaneous moments" Optics Express, 17(20):17784-91, 2009.

26. Rajshekhar, G., Gorthi, S. S. and Rastogi, P. "An adaptive window Wigner-Ville distribution based method to estimate phase derivative from optical fringes" Optics Letters, 34(20):3151-3153, 2009.

27. Rajshekhar, G., Gorthi, S. S. and Rastogi, P. "Strain, curvature and twist measurements in digital holographic interferometry using pseudo Wigner-Ville distribution based method" Review of Scientific Instruments, 80(093107), 2009.

28. Rajshekhar, G., Gorthi, S. S. and Rastogi, P. "Polynomial Wigner-Ville distribution based method for direct phase derivative estimation from optical fringes" Journal of Optics A: Pure and Applied Optics, 11(125402), 2009.

29. Gorthi, S. S. and Rastogi, P. "Improved high-order ambiguity function method for the estimation of phase from interferometric fringes" Optics Letters, 34(17):2575-2577, 2009.

30. Gorthi, S. S. and Rastogi, P. "Windowed high-order ambiguity function method for fringe analysis" Review of Scientific Instruments, 80(7):073109, 2009.

31. Gorthi, S. S. and Rastogi, P. "Estimation of phase derivatives using discrete chirp-Fourier transform based method" Optics Letters, 34(16):2396-2398, 2009.

32. Gorthi, S. S. and Rastogi, P. "Discrete chirp Fourier transform based analysis of reconstructed interference fields in digital holographic interferometry" Journal of Modern Optics, 56(12):1317-1322, 2009.

33. Gorthi, S. S. and Rastogi, P. "Analysis of reconstructed interference fields in digital holographic interferometry using polynomial phase transform" Measurement Science and Technology, 20(075307):1-6, 2009.

34. Gorthi, S. S. and Rastogi, P. "Piecewise polynomial phase approximation approach for the analysis of reconstructed interference fields in digital holographic interferometry" Journal of Optics A: Pure and Applied Optics, 11(065405):1-6, 2009.

35. Gorthi, S. S. and Rastogi, P. "Numerical analysis of fringe patterns recorded in holographic interferometry using high-order ambiguity function" Journal of Modern Optics, 56(8):949-954, 2009.

36. Zander, T. E., Madyastha, V., Patil, A., Rastogi, P. and Reindl, L. M. "Phase-step estimation in interferometry via an unscented Kalman filter" Optics Letters, 34, 1396-1398, 2009.

**2007**

37. Langoju R., Patil A., and Rastogi P., 2007, Statistical study of generalized nonlinear phase step estimation methods in phase-shifting interferometry, Applied Optics, Vol. 46, pp. 8007-8014.

38. Patil A., Langoju R., and Rastogi P., 2007, Statistical study and experimental verification of high resolution methods in phase-shifting interferometry, Journal of the Optical Society of America A, Vol. 24, pp. 794-813.

39. Gundu P., Hack E., and Rastogi P., 2007, Adaptive optics interferometer using superspeckles for high resolution deformation measurement, Optics Communications, Vol. 278, pp. 382-386.

40. Patil A. and Rastogi P., 2007, Moving ahead with phase, Optics and Lasers in Engineering, Vol. 45, pp. 253-257.

41. Patil A., Langoju R., and Rastogi P., 2007, Phase shifting interferometry using a robust parameter estimation method, Optics and Lasers in Engineering, Vol. 45, pp. 293-297.

42. Langoju R., Patil A., and Rastogi P., 2007, Real-time phase-step estimation in phase-shifting interferometry, Optical Engineering, Vol. 46, pp. 35601-1-5.

43. Langoju R., Patil A., and Rastogi P., 2007, A novel approach for characterizing the nonlinear phase steps of the PZT in interferometry, Optics and Lasers in Engineering, Vol. 45, pp. 258-264.

**2006**

44. Langoju R., Patil A., and Rastogi P., 2006, Phase-shifting interferometry in the presence of nonlinear phase steps, harmonics, and noise, Optics Letters, Vol. 31, pp. 1058-1060.

45. Langoju R., Patil A., and Rastogi P., 2006, "Accurate nonlinear phase step estimation in phase shifting interferometry," Optics Communications, Vol. 266, pp. 638-647.

46. Patil A. and Rastogi P., 2006, A min-norm approach for estimating phase distribution in an interferogram, Journal of Modern Optics, Vol. 53, pp. 283-293.

47. Patil A., Langoju R., and Rastogi P., 2006, Constraints in dual-phase shifting interferometry, Optics Express, Vol. 14, pp. 88-102.

48. Patil A., Langoju R., and Rastogi P., 2006, A state space approach in phase shifting interferometry, Optics Communications, Vol. 263, pp. 281-288.

49. Langoju R., Patil A., and Rastogi P., 2006, Chirp estimation method in phase shifting interferometry, Optics Letters, Vol. 31, pp. 1982-1984.

50. Patil A. and Rastogi P., 2006, Phase determination in holographic moiré in presence of nonsinusoidal waveforms and random noise, Optics Communications, Vol. 257, pp. 120-132.

51. Langoju R., Patil A., and Rastogi P., 2006, "Estimation of multiple phases in interferometry in the presence of non-linear arbitrary phase steps," Optics Express, Vol. 14, pp. 7686-7691.

52. Langoju R., Patil A., and Rastogi P., 2006, Predicting phase step in phase shifting interferometry in the presence of harmonics and noise, Applied Optics, Vol. 45, pp. 6106-6112.

**2005**

53. Langoju R., Patil A., and Rastogi P., 2005, Resolution enhanced Fourier Transform method for the estimation of multiple phases in Interferometry, Optics Letters, Vol. 30, pp. 3326-3328.

54. Patil A. and Rastogi P., 2005, Phase shifting interferometry by covariance-based method, Applied Optics, Vol. 44, pp. 5778-5785.

55. Patil A., Langoju R., and Rastogi P., 2005, Model based processing of holographic moiré, Optics Letters, Vol. 30, pp. 2870-2872.

56. Langoju R., Patil A., and Rastogi P., 2005, Super-resolution Fourier Transform method in phase shifting interferometry, Optics Express, Vol. 13, pp. 7160 7173.

57. Gundu, P.N., Hack, E., and Rastogi, P., 2005, Superspeckles: a new application of optical superresolution, Optics Express, Vol. 13, pp. 6468 6475.

58. Patil A. and Rastogi P., 2005, Maximum-likelihood estimator for dual phase extraction in holographic moiré, Optics Letters, Vol. 30, pp. 2227 - 2229.

59. Gundu, P.N., Hack, E., and Rastogi, P., 2005, High efficient superresolution combination filter with twin LCD spatial light modulators, Optics Express, Vol. 13, pp. 2835-2842.

60. Patil A. and Rastogi P., 2005, Rotational invariance approach for the evaluation of multiple phases in interferometry in presence of nonsinusoidal waveforms and noise, Journal of Optical Society of America A, Vol. 22, 1918 1928.

61. Gundu, P.N., Hack, E., and Rastogi, P., 2005, Apodized superresolution - concepts and simulations, Optics Communications, Vol. 249, pp. 101-107.

62. Patil A. and Rastogi P., 2005, Estimation of multiple phases in holographic moiré in presence of harmonics and noise using minimum-norm algorithm, Optics Express, Vol. 13, pp. 4070-4084.

63. Patil A., Langoju R., and Rastogi P., 2005, High-resolution frequency estimation technique for recovering phase distribution in interferometers, Optics Letters, Vol. 30, pp. 391-393.

64. Patil A. and Rastogi P., 2005, Subspace-based method for phase retrieval in interferometry, Optics Express, Vol.13, pp. 1240-1248.

65. Patil A., Raphael B., and Rastogi P., 2005, Introduction of stochastic methods to phase-shifting interferometry, Journal of Modern Optics, Vol. 52, pp. 33-44.

66. Patil A. and Rastogi P., 2005, Nonlinear regression technique applied to generalized phase-shifting interferometry, Journal of Modern Optics, Vol. 52, pp. 573-582.

67. Patil A., Raphael B., and Rastogi P., 2005, A stochastic method for generalized data reduction in holographic moiré, Optics Communications, Vol. 248, pp. 395-405.

68. Patil A. and Rastogi P., 2005, Approaches in generalized phase shifting interferometry, Optics and Lasers in Engineering, Vol. 43, pp. 475-490.

69. Hack, E., Gundu, P.N., and Rastogi, P., 2005, Adaptive correction to the speckle correlation fringes using a twisted-nematic liquid-crystal display, Applied Optics, Vol. 44, pp. 2772-2781.

**2004**

70. Patil A., Langoju R., and Rastogi P., 2004, An integral approach to phase shifting interferometry using a super-resolution frequency estimation method, Optics Express, Vol.12, 4681-4697.

71. Patil A., Raphael B., and Rastogi P., 2004, Generalized phase-shifting interferometry using a direct stochastic algorithm for global search, Optics Letters, Vol. 29, 1381-1383.

72. Zhou Y., and Rastogi P., 2004, Fourier decomposition method for mode characterization in metal-clad fiber with complex index profile, Optics Communications, Vol. 237, pp. 325-332.

**2003**

73. Mohan N.K. and Rastogi P., 2003, Recent Developments in Digital Speckle Pattern Interferometry, Optics and Lasers in Engineering, Vol. 40, pp. 439-588.

74. Ferraro P. and Rastogi P.K., 2003, Quaternary of Optics in Italy: Different aspects and applications of coherent radiation, optoelectronics, and liquid crystals, Optics and Lasers in Engineering, Vol. 39, pp. 265-268.

75. Ferraro P. and Rastogi P.K., 2003, Quaternary of Optics in Italy: Optical methods in testing and characterization of materials, Optics and Lasers in Engineering, Vol. 39, pp. 123-125.

76. Rastogi P. and Sharma A., 2003, A systematic approach to image formation in digital holography, Optical Engineering, Vol. 42, pp. 1208-1214.

77. Rastogi P. and Sandoz J.L., 2003, Mechanical evaluation of finger-jointed timber assemblies using holographic moiré interferometry, Optical Engineering, Vol. 42, pp. 1321-1327.

78. Lloret S., Rastogi P., Thevenaz L. and Inaudi D., 2003, Measurement of dynamic deformations using a path unbalance Michelson interferometer based optical fiber sensing device, Optical Engineering, Vol. 42, pp. 662-669.

79. Mohan N.K. and Rastogi P.K., 2003, Phase shift Calibration in Speckle Photography A First Step to Practical Real Time Analysis of Speckle Correlation Fringes, Journal of Modern Optics, Vol. 50, pp. 1183-1188.

80. Lloret S., Rastogi P.K., Inaudi D. and Thevenaz L., 2003, A Fiber-Optic Sensor for Dynamic Deformation Measurements Based on the Intensity Modulation of a Low Coherence Source, Journal of Modern Optics, Vol. 50, pp. 1189-1194.