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Rapid optical inspection of micro deep drawing parts by means of digital holography

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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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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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Authors and Affiliations

  1. Department of Optical Metrology, BIAS GmbH, Klagenfurter Str. 2, 28359, Bremen, Germany

    Nan Wang, Christoph von Kopylow & Claas Falldorf

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  1. Nan Wang
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  2. Christoph von Kopylow
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  3. Claas Falldorf
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Correspondence to Nan Wang.

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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

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