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TZID:Asia/Calcutta
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DTSTART:19451014T230000
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BEGIN:VEVENT
DTSTAMP:20120404T154110Z
UID:E116B1A2-CB18-102F-97F7-0050568D3657
DTSTART;TZID=Asia/Calcutta:20120330T160000
DTEND;TZID=Asia/Calcutta:20120330T170000
DESCRIPTION:Dr. Abhijit Ganguli Assistant Professor Dept. of Civil Engineer
 ing\, IIT Delhi will speak on "Ultrasonic Focusing and Imaging in Damage D
 etection Scenarios" Abstract: Concepts of ultrasonic imaging with phased a
 rrays related to biomedical engineering are finding increasing application
  in non‐destructive evaluation of solid structures. Ultrasound is ty
 pically used in the imaging of the fetus and breast cancer monitoring. Foc
 used ultrasound is used in ablation of cancer affected tissues. Even thoug
 h phased array technology is used in damage detection scenarios\, research
  on focused ultrasound in non‐destructive evaluation scenarios is st
 ill in a developmental stage. Beam steering and focusing enables the user 
 to interrogate a particular region of interest inside the material. Howeve
 r\, the ultrasonic wave propagates with decreasing amplitude in an attenua
 tive material\, leading to lower energy levels reaching the target. The fi
 rst part of my talk deals with evaluation of the efficiency of ultrasonic 
 focusing in an attenuative medium like cement ortar or concrete (one of th
 e most common materials in civil engineering solids) through ultrasonic me
 asurements. The second part of my talk deals with numerical simulations on
  the Synthetic Aperture Focusing Technique (SAFT) for the detection of air
  void defects affecting various locations inside a reinforced concrete med
 ium. Low frequency elastic wave propagation\, generated by the Impactâ€
 Echo method is simulated in two dimensions\, using the Finite Difference
  in Time Domain (FDTD) method. Waveforms received at various receiver loca
 tions on the surface are cross‐correlated with a reference point sca
 tterer response function to form an interior image of the concrete medium.
  We also demonstrate that by using all of the mode conversions of the scat
 tered wave in the image synthesis results in a more rbust sensing algorith
 m.\n\nSpeaker(s): \, \, \, \, \, \n\nRoom: DA 229\, Bldg: ACES\, Departmen
 t of Electrical Engineering\, Indian Institute of Technology Kanpur\, Kanp
 ur\, Uttar Pradesh\, India\, 208016
LOCATION:Room: DA 229\, Bldg: ACES\, Department of Electrical Engineering\,
  Indian Institute of Technology Kanpur\, Kanpur\, Uttar Pradesh\, India\, 
 208016
ORGANIZER:pradeepk@iitk.ac.in
SEQUENCE:2
SUMMARY:IEEE Seminar - Ultrasonic Focusing and Imaging in Damage Detection 
 Scenarios
URL;VALUE=URI:https://events.vtools.ieee.org/m/11757
X-ALT-DESC:Description: <br />Dr. Abhijit Ganguli\nAssistant Professor\nDep
 t. of Civil Engineering\, IIT Delhi\n\nwill speak on\n\n"Ultrasonic Focusi
 ng and Imaging in Damage Detection Scenarios"\n\nAbstract: \nConcepts of u
 ltrasonic imaging with phased arrays related to biomedical engineering are
  \nfinding increasing application in non‐destructive evaluation of s
 olid structures. \nUltrasound is typically used in the imaging of the fetu
 s and breast cancer monitoring.\n Focused ultrasound is used in ablation o
 f cancer affected tissues. Even though \nphased array technology is used i
 n damage detection scenarios\, research on focused \nultrasound in nonâ
 €destructive evaluation scenarios is still in a developmental stage.\n
  Beam steering and focusing enables the user to interrogate a particular r
 egion of \ninterest inside the material. However\, the ultrasonic wave pro
 pagates with decreasing \namplitude in an attenuative material\, leading t
 o lower energy levels reaching the target.\n The first part of my talk dea
 ls with evaluation of the efficiency of ultrasonic focusing\n in an attenu
 ative medium like cement ortar or concrete (one of the most common materia
 ls\n in civil engineering solids) through ultrasonic measurements.\n \nThe
  second part of my talk deals with numerical simulations on the Synthetic 
 Aperture \nFocusing Technique (SAFT) for the detection of air void defects
  affecting various locations\n inside a reinforced concrete medium. Low fr
 equency elastic wave propagation\, generated \nby the Impact‐Echo me
 thod is simulated in two dimensions\, using the Finite Difference in \nTim
 e Domain (FDTD) method. Waveforms received at various receiver locations o
 n the surface \nare cross‐correlated with a reference point scattere
 r response function to form an interior\nimage of the concrete medium. We 
 also demonstrate that by using all of the mode conversions\nof the scatter
 ed wave in the image synthesis results in a more rbust sensing algorithm.
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