scholarly journals Shape and deformation measurements of rough surfaces by phase-shifting digital holography

2021 ◽  
Vol 13 (4) ◽  
pp. 70
Author(s):  
Ichirou Yamaguchi
Keyword(s):  
Digital Holography ◽  
Noise Suppression ◽  
Rough Surfaces ◽  
Speckle Noise ◽  
Photonic Devices ◽  
Phase Shifting ◽  
Surface Shape ◽  
Shape Measurement ◽  
Optical Surfaces ◽  
Digital Holograms

In digital holography recording as reconstruction of holograms are performed digitally by modern photonic devices to increase of optical non-contacting measurements of various kinds of surfaces including both specular and rough surfaces. In this article we discusses these features of digital holography using phase shifting techniques that has much extended its capabilities. Full Text: PDF ReferencesG. Bruning, D.R. Herriott, J.E. Gallagher, D.P. Rosenfeld, A.D. White, D.J. Brangaccio, "Digital Wavefront Measuring Interferometer for Testing Optical Surfaces and Lenses", Appl. Opt. 13, 2693 (1974). CrossRef I. Yamaguchi, T. Zhang, "Phase-shifting digital holography", Opt. Lett. 22, 1268 (1997). CrossRef F. Zhang, I. Yamaguchi, L.P. Yaroslavsky, "Algorithm for reconstruction of digital holograms with adjustable magnification", Opt. Lett. 29, 1668 (2004). CrossRef I. Yamaguchi, "Holography, speckle, and computers", Optics and Lasers in Engineering 39, 411 (2003). CrossRef I. Yamaguchi, M. Yokota, "Speckle noise suppression in measurement by phase-shifting digital holography", Opt. Eng. 48 085602 (2009). CrossRef I. Yamaguchi, J. Kato, S. Ohta, "Surface Shape Measurement by Phase-Shifting Digital Holography", Opt. Rev. 8, 85 (2001). CrossRef I. Yamaguchi, J. Kato, H. Matsuzaki, "Measurement of surface shape and deformation by phase-shifting image digital holography", Opt. Eng. 42, 1267 (2003). CrossRef F. Zhang, J.D.R. Valera, I. Yamaguchi, M. Yokota, G. Mills, "Vibration Analysis by Phase Shifting Digital Holography", Opt. Rev. 11, 5 (2004). CrossRef

Determination of Phase Shift by Digital Holography

2019 ◽  
Vol 888 ◽  
pp. 43-46
Author(s):  
Yoshitaka Takahashi ◽  
Masatoshi Saito ◽  
Toru Nakajima ◽  
Masakazu Shingu
Keyword(s):  
Phase Shift ◽  
Noise Reduction ◽  
Digital Holography ◽  
High Accuracy ◽  
Measured Data ◽  
Phase Shifting ◽  
Surface Shape ◽  
Shape Measurement ◽  
Phase Shifting Interferometry

In phase shifting interferometry phase shift is applied by various ways, but applying it with high accuracy, especially by LD current modulation, is not easy. In order to determine the accurate phase shift a new method has been proposed that the value of LD current corresponding to π/2 phase shift can be determined by phase shifting digital holography. The measured data of standard in surface shape measurement were used for calibration, and the obtained value was confirmed to cause noise reduction and improvement of holographic reconstructed images in digital holography.

Surface Shape Measurement by Phase-Shifting Digital Holography

2001 ◽  
Vol 8 (2) ◽  
pp. 85-89 ◽  
Author(s):  
Ichirou Yamaguchi ◽  
Jun-ichi Kato ◽  
Sohgo Ohta
Keyword(s):  
Digital Holography ◽  
Phase Shifting ◽  
Surface Shape ◽  
Shape Measurement

Doppler phase-shifting digital holography and its application to surface shape measurement

2010 ◽  
Vol 35 (10) ◽  
pp. 1548 ◽  
Author(s):  
Yuichi Kikuchi ◽  
Daisuke Barada ◽  
Tomohiro Kiire ◽  
Toyohiko Yatagai
Keyword(s):  
Digital Holography ◽  
Phase Shifting ◽  
Surface Shape ◽  
Shape Measurement

Surface Shape Measurement by Dual-wavelength Phase-shifting Digital Holography

Fringe 2005 ◽  
2006 ◽  
pp. 396-403 ◽  
Author(s):  
Ichirou Yamaguchi ◽  
Shinji Yamashita ◽  
Masayuki Yokota
Keyword(s):  
Digital Holography ◽  
Phase Shifting ◽  
Surface Shape ◽  
Dual Wavelength ◽  
Shape Measurement

Surface shape measurement by phase-shifting digital holography with a wavelength shift

2006 ◽  
Vol 45 (29) ◽  
pp. 7610 ◽  
Author(s):  
Ichirou Yamaguchi ◽  
Takashi Ida ◽  
Masayuki Yokota ◽  
Kouji Yamashita
Keyword(s):  
Digital Holography ◽  
Phase Shifting ◽  
Surface Shape ◽  
Shape Measurement ◽  
Wavelength Shift

Noise Filter for Surface Shape Measurement in Digital Holography

2019 ◽  
Vol 888 ◽  
pp. 47-51 ◽  
Author(s):  
Yoshitaka Takahashi ◽  
Masakazu Shingu ◽  
Masatoshi Saito ◽  
Toru Nakajima ◽  
Ryutaro Sekiguchi ◽  
...  
Keyword(s):  
Digital Holography ◽  
Moving Average ◽  
Speckle Noise ◽  
Surface Shape ◽  
Shape Measurement ◽  
Shape Information ◽  
Difference Image ◽  
Noise Filter ◽  
Contact Shape ◽  
Average Filter

Phase difference image using phase-shifting digital holography is one of the prospective methods for non-contact shape measurement. For the application, filtering of the obtained image is needed to reduce the speckle noise. Conventional filter, e.g. moving average filter, causes loss of the shape information especially around the region with high steepness. To solve this problem novel filter has been developed that kept steepness of the shape in noise reduction. The filtered data were compared with conventionally filtering ones and the former was closer to the data observed by a laser measuring microscope.

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