17 November 2010 Measurement of inner surface profile of a tube using two wavelength phase-shifting digital holography
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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.
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Masayuki Yokota, Masayuki Yokota, Toru Adachi, Toru Adachi, Yusuke Sakamoto, 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); doi: 10.1117/12.868902; https://doi.org/10.1117/12.868902
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