NDT.net - April 2002, Vol. 7 No.04

Investigations on the appearance of material faults in holographic interferograms

Ulrike Mieth
Fraunhofer-Institut für angewandte Materialforschung und Fertigungstechnik
Wiener Straße 12, D-28359 Bremen
Wolfgang Osten, Werner Jüptner
Bremer Institut für angewandte Strahltechnik
Klagenfurter Straße 2, D-28359 Bremen
Germany

1. Introduction

2. Hypothesis on the appearance of faults in fringe patterns

3. Fringe patterns, contour lines and ordinary differential equations

4. Properties of plane, autonomous Hamiltonian systems of differential equations

5. Conclusions for fringe patterns

6. Finite set of fault indicating fringe irregularities

7. Conclusion

8. References

  1. Jüptner, W.; Grünewald, K.; Kreitlow, H.: Investigations on the defect evaluation of reactor structures by means of holographic interferometry, BIAS 1978, Internal Report
  2. Höfling, R.; Aswendt, P.: Fehlerkatalog eines innendruckbelasteten CFK-Rohres, Bericht zum BMFT-Verbundprojekt 13N59009 8 „Holometec – Werkstoffgrundliche Grundlagen“, Chemnitz 1995
  3. Jüptner, W.; Kreis, Th.; Mieth, U.; Osten, W.: Application of neural networks and knowledge based systems for automatic identification of fault indicating fringe patterns, Proc. SPIE Interferometry´94, vol. 2342(1994), 16-26
  4. Mieth, U.; Osten, W.; Jüptner, W.: Knowledge assisted fault detection based on line features of skeletons, Proc. Fringe ´93, Akademie Verlag Berlin 1993, 367-373
  5. Mieth, U.; Osten, W.; Jüptner, W.: Numerical investigations on the appearance of material flaws in holographic interference patterns, Proc. International Symposium on Laser Applications in Precision Measurement, Balatonfüred 1996, Akademie Verlag Berlin 1996, 218-225
  6. Mieth, U.: Erscheinungsbild von Materialfehlern in holografischen Interferogrammen, BIAS Verlag, Band 11, 1998
  7. Grimshaw, R.: Nonlinear ordinary differential equations, CRC Press Boca Raton, Florida, 1993
  8. Walter, W.: Analysis 2, Springer-Verlag, Berlin Heidelberg, 1995

This Paper was presented at Fringe 2001 "The 4th International Workshop on Automatic Processing of Fringe Patterns" held in Bremen, Germany, 17-19 September 2001. Proceedings edited by Wolfgang Osten, BIAS, Germany. Please contact Wolfgang Osten for full set of proceedings at wolfgang@uni-bremen.de.

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