Prof. S Mohan
Vel Tech University, India
New Developments in NDT Through Electronic Speckle Pattern Interferometry (ESPI)

The recently evolved optoelectronic technique namely Electronic Speckle Pattern interferometry(ESPI) is a fast developing optical technique widely used for measuring displacement componenets, their derivatives, surface roughness, surface contours, shape etc.,. Due to non contact nature and high sensitivity, this technique has been used as a powerful on line inspection tool for non destructive pattern of materials in industrial environment.

  ESPI is an alternate non destructive technique suitable for propellant grains and other low modulus materials used in space vehicle systems.

An endoscopic electronic speckle pattern interferometer camera can be applied to examine objects as well as for in vitro and in vivo minimal invasive medical diagnostics. The combination of holographic interferometric metrology with endoscopic imaging allows the development of a special class of instruments for nondestructive quantitative diagnostics within the body cavities.

Nondestructive testing through electronic speckle pattern interferometry techniques paved a revolution not only for industrial environment but also in medical field. This lecture will deal with these developments with several case study


Mohan Sriramulu; B.Sc, M.Sc, Ph.D, D.Sc, Dip. in German, H.R.D, Buss. Management and Administration; Educationist; b April 3, 1947 Chennai, Educ. Madras Univ; Teaching Research Fellow 1969–72; Asst. Prof., Presidency College 1973–80; Reader, Anna University 1980–87; Prof., Pondicherry University 1988–2002, 2005–06; Prof., Asian Inst. Med. Sci. and Tech. (Malaysia) 2003–04; Director–Res. and Dev., PR Inst. of Sci. & Tech. 2006–2007; Vice Chancellor, PRIST University, Thanjavur 2008–2010, Dean, Senior Professor of Materials Science, Hawassa University, Ethiopia 2010– 2012, Dean-Research, VelTech University, 2013, President: Spectroscopic Soc. of India, Member: Indian Chemical Soc., New York Academy of Scis., Indian Soc. for Experiential Learning, Soc. for Chemists–France, Indian Physics Association, Soc. for the Progress of Sci., International Consortium for Experiential Learning, Laser and Spectroscopic soc. of India, Indian Council for Research in Educational Media; Patron–Spectrophysics Assn. of India, Vice President–Photonics Soc. of India; Publs–More than 800 papers published in various International and National journals of repute and 14 books; Guided 72 Ph.D scholars; organized 10 National conferences, 6 Refresher courses, one Summer school and third International Conf. on Experiential learning at Pondicherry 2002 and International Conf. on Photonics, Nanotechnology and Computer applications 2009. Contributed several papers to Experential learning; Awards–International Man of the Year 1997, 1998; Best Researcher ISPA award 1999; Scientist of the year 2001 award; Meritorious Educational Excellence award, 2002; Best scientist of the year 2004 award; Best teacher award 2004; Member in the Editorial board of Spectrochim Acta; INCONS 2005 award for Best Teacher, Researcher and Administer, Address (Res) 7, 3 rd cross, Kumaran Nagar Extension, Lawspet, Pondicherry 605 008. (off) Dean, Research, Vel Tech University, Avadi, Chennai 600 062

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