Neutrograph T. Pirling Institut Laue Langevin INSTITUT MAX VON LAUE - - PowerPoint PPT Presentation

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Neutrograph T. Pirling Institut Laue Langevin INSTITUT MAX VON LAUE - - PowerPoint PPT Presentation

Aug 23, 2022 210 likes •439 views

The Renaissance of Neutrograph T. Pirling Institut Laue Langevin INSTITUT MAX VON LAUE - PAUL LANGEVIN Camera Obscura INSTITUT MAX VON LAUE - PAUL LANGEVIN INSTITUT MAX VON LAUE - PAUL LANGEVIN Strain imager (Railway-head, Webster, Hughes,

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INSTITUT MAX VON LAUE - PAUL LANGEVIN

The Renaissance

  • f

Neutrograph

  • T. Pirling

Institut Laue Langevin

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Camera Obscura

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Strain imager

(Railway-head, Webster, Hughes, ILL)

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Sketch from 17th century g b B G D Magnification : b/g Light efficiency : D/b Blurr : D*(b+g)/g

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Neutron Imaging

SIZE (CM) L/D Flux 1 x 106 s-1 cm-2 CONRAD2@HZB (cold) 10 500 5.8 ANTARES@FRM2 (cold) 40x40 400 100 ICON@PSI (cold) 40 600 3.4 Neutrograph@ILL 20 150 3000*

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INSTITUT MAX VON LAUE - PAUL LANGEVIN

Neutrograph

divergence (deg) field of view (mm) D (mm) L/D Blurr at detector distance (mm): 50 100 200 1.5 130 1 5000 0.01 0.02 0.04 5 1000 0.05 0.1 0.2 20 250 0.2 0.4 0.8

Flux : 3 109 n cm-2 s-1

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INSTITUT MAX VON LAUE - PAUL LANGEVIN

Neutron radiography at ILL pre 2010

Electrically driven four-piston BMW engine - Universität Heidelberg, Paul-Scherrer-Institut and TU München NEUTROGRAPH at ILL Grenoble flux of 3*109 n/cm2s and a collimation of L/D=140.

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Pb Pb Fast shutter Sample positions CCD camera Scintillator screen

70 mm

Boronated polyethylene Aperture, B4C Fritte plus Pb (alternative Positions between here and camera)

(between 2 and 50 mm in diameter)

B4C-window 50x50mm2 Pb, protected by 5mm borated rubber Pb

First experiment

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First experiment

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First experiment

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Neutrograph 10m

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Neutrograph 14m50

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Immediate solution

  • Improvements of biological shielding and
  • peration / safety
  • Installation of xyz- and rotation stage
  • Optical bench for flexible set-up
  • Szintillator screens
  • Variable collimator
  • > High flux = fast, medium resolution

Radiography/Tomography station

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SALSA –today!

radial strain

1000 2000 3000 4000 5000 6000 7000 8000

  • 10
  • 8
  • 6
  • 4
  • 2

position / mm strain / 1-^-6

radial Fe(110) collimator

High resolution, multiphase materials (case hardened steel wind turbine bearing) Stress mapping in extremely large components

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Dissimilar weld

austenitic INCONEL ferritic

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Texture imaging

Ferritic Buttering Weld austenitic

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Super SALSA

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Next generation strain scanner

Time of flight Monochromatic (SALSA) Continuous white beam Whole diffractogram 1 diffraction peak at a time At least large part of diffractogram Duty cycle 6% (POLDI) Reflectivity of crystal monochromator 60% Reflectivity of crystal analyser 60% Large detector coverage possible Detector coverage limited to

  • typ. 5° x 15° in 2q

Large analyser/detector coverage possible 2 strain components available 1 strain component available 2 strain components available Good focalisation of prim. White beam needed Monochromatic beam is focalised on sample (~20mm) Good focalisation of prim. white beam needed High activation of sample Low activation of sample Even higher activation of sample Efficiency depends mainly on focalisation of prim. beam

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  • Strain/stress imaging
  • Manipulation of large samples
  • Bragg edge technique: texture imaging

in engineering components, fast strain mapping

  • Wavelength selective imaging
  • PGNAA with lateral resolution
  • Fast tomography to follow in-situ

dynamic processes in 3D

  • Variable beam size in both parallel

beam and focusing beam geometries

  • water intake in rocks, medical implants
  • Follow dynamic processes (i.e. water,

paint etc intake)

  • Cultural heritage objects
  • Texture imaging in engineering

components, fast strain mapping

  • Stresses, built up during solidification
  • Heat treatment
  • Tensile testing
  • Multiphase materials, i.e. dissimilar

welds

TOMO and SUPER-SALSA

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Next generation strain scanner