AAE552-Session20

AAE552-Session20 - AAE 552 Spring 2009 A. F. Grandt AAE...

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AAE 552 Spring 2009 – A. F. Grandt 1 1 AAE 552: Nondestructive Evaluation of Structures and Materials A. F. Grandt, Jr. Professor of Aeronautics and Astronautics Purdue University W. Lafayette, IN 47907 Session 20 – 27 February 2009 2 Contact Information Alten F. (Skip) Grandt, Jr. Email: aae552@ecn.purdue.edu Telephone: Office: 765-494-5141 Home: 765-463-4276 FAX: 765-494-0307 Course webpage accessed at: http://www.itap.purdue.edu/tlt/blackboard 3 AAE 552 Session 20 27 February 2009 Last Time: Neutron Radiography Image Formation Computed Tomography Today: Finish CT Backscatter X-ray Image Quality Applications 4 Chapter 11: Radiography Topics Overview Absorption/Scatter Radiation sources Image formation Image quality Examples Computed Tomography Safety issues Summary 5 Assignment Please read Textbook : Chapter 11 Webpage powerpoint references “Radiographic Testing” – collaboration for NDT education Paper #1 – Due Session 21 (2 March 2009) Exam #1 – Session 29 (Friday, 27 March 2009) Final Exam – Wednesday, 6 May 2009 (comprehensive) 6 Neutron Radiography Alternate energy source complements materials that can be inspected by x-rays or gamma-rays Some low density materials that are transparent to x- rays absorb neutrons Hydrogen, lithium, boron Some high density materials that are opaque to x- rays pass neutrons Lead, Bismuth, Uranium Applications Rubber O rings Metal jacketed explosives (ordnance devices Corrosion products Residual core for investment cast turbine blades doped with Bd 2 O 2
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AAE 552 Spring 2009 – A. F. Grandt 2 7 X-ray and Neutron Mass Attenuation Coefficients vs Atomic Number Fig. 11.8 Mass Attenuation Coefficient ( μ m/ ρ ) Atomic Number X-rays Imaging Modalities Several different imaging methods are available to display the final image in industrial radiography: Film Radiography Real Time Radiography Computed Tomography (CT) Digital Radiography (DR) Computed Radiography (CR) Computed Tomography 9 10 Computed Tomography (CT) Special imaging technique that provides cross sectional view Can be used with variety of energy beams (ultrasonic, x-rays, etc) Mathematical principle described in 1917 by Radon Any 2-d distribution can be reconstructed from infinite set of line integrals thru distribution Practical applications 1960’s and 70’s Early applications in medical field Conventional radiography compresses 3-d into 2-d view Can’t specify flaw shape/location Interpretation difficult Tomogram provides 3-d view by combining results of multiple images from different directions 11 Reconstructed cross sectional image of object Scans (thin slice) taken at different
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This note was uploaded on 11/04/2010 for the course AAE 552 taught by Professor Longuski during the Spring '10 term at IUPUI.

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AAE552-Session20 - AAE 552 Spring 2009 A. F. Grandt AAE...

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