Abstract
We present an experimental approach to rapidly measure the 3D shape of a micro deep drawing part, which is based on a digital holographic contouring. Inline quality control in a micro deep drawing process requires a rapid and nondestructive measurement technique, which is the significant advantage of digital holography. The surface structure of the investigated object is dominated by the properties of the drawing process. Therefore, we investigate the statistical properties of the light scattered from the surface and show that digital holography is applicable in this case. Finally, we present experimental results which proof the big potential of digital holography in regards to the inspection of micro parts. It is shown that the field of depth can be considerably enhanced by combining several reconstructions associated with different observation planes from a set of two recorded holograms.
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References
Prasad V, Semwogerere D, Weeks ER (2007) Confocal microscopy of colloids. J Phys-Condens Mat 19:3102
Rad LB, Feng H, Ye J, Pease RFW (2007) Computational Scanning Electron Microscopy. In: Proceedings of the international conference on frontiers of characterization and metrology 931:512–517
Su X, Zhang Q (2010) Dynamic 3-D shape measurement method: a review. Opt Laser Eng 48:191–204
Falldorf C, Kopylow Cv, Agour M, Bergmann RB (2010) Measurement of thermally induced deformations by means of phase retrieval. In: Proceedings of the ISOT:1–5
Kreis T (2005) Handbook of holographic interferometry: optical and digital methods. Wiley, Weinheim
Schnars U, Jueptner W (2005) Digital holography: digital hologram recording, numerical reconstruction, and related techniques. Springer, New York
Meeser T, Kopylow Cv, Falldorf C (2010) Advanced digital lensless fourier holography by means of a spatial light modulator. In: Proceedings of the 3DTV-conference, pp 1–4
Goodman JW (2005) Introduction to fourier optics. McGraw-Hill, New York
Falldorf C (2011) Measuring the complex amplitude of wave fields by means of shear interferometry. J Opt Soc Am A 8:1636–1647
Goodman JW (1975) Statistical properties of laser speckle patterns. In: Laser speckle and related phenomena, Springer, pp 9–75
Falldorf C, Osten W, Kolenovic E (2003) Speckle shearography using a multiband light source. Opt Laser Eng 40:543–552
Osten W (2000) Digital processing and evaluation of fringe patterns in optical metrology and non-destructive testing. In: Modern optical methods in experimental solid mechanics, Springer, Wien, p 289
Acknowledgments
The authors would like to thank Prof. R. B. Bergmann for valuable discussions. Further, we gratefully acknowledge the financial support by the DFG (German Research Foundation) within the frame of subproject B5 Sichere Prozesse of the SFB 747 (Collaborative Research Center) “Mikrokaltumformen—Prozesse, Charakterisierung, Optimierung”.
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Wang, N., von Kopylow, C. & Falldorf, C. Rapid optical inspection of micro deep drawing parts by means of digital holography. Prod. Eng. Res. Devel. 6, 47–53 (2012). https://doi.org/10.1007/s11740-011-0350-x
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DOI: https://doi.org/10.1007/s11740-011-0350-x