Measurement of inner surface profile of a tube using two wavelength phase-shifting digital holography

Masayuki Yokota; Toru Adachi; Yusuke Sakamoto

doi:10.1117/12.868902

17 November 2010 Measurement of inner surface profile of a tube using two wavelength phase-shifting digital holography

Masayuki Yokota, Toru Adachi, Yusuke Sakamoto

Proceedings Volume 7848, Holography, Diffractive Optics, and Applications IV; 78481A (2010) https://doi.org/10.1117/12.868902
Event: Photonics Asia 2010, 2010, Beijing, China

Abstract

A digital holographic method for evaluation of an inner surface profile of tubes is proposed. For surface contouring, two wavelength method using an injection-current induced wavelength change of a laser diode is used. To obtain the inner surface profile, a cone-shaped mirror is inserted into the tube. Distribution of an optical path length in the experimental alignment is calculated and utilized to compensate for a distortion occurring in the experimental profile of the surface due to a deviation of a mirror position. The shape of two seals pasted on the inner surface can be evaluated by the method with a digital image processing. It is shown that the proposed method can visualize and detect three dimensional shape of defects on the inner surface of tubes.

Citation Download Citation

Masayuki Yokota, Toru Adachi, and Yusuke Sakamoto "Measurement of inner surface profile of a tube using two wavelength phase-shifting digital holography", Proc. SPIE 7848, Holography, Diffractive Optics, and Applications IV, 78481A (17 November 2010); https://doi.org/10.1117/12.868902

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