论文信息 - Pulsed TV Holography Combined with Digital Speckle Photography Restores Lost Interference Phase.

Pulsed TV Holography Combined with Digital Speckle Photography Restores Lost Interference Phase.

The measuring of situations with optical measuring methods is difficult when a deformation field must be determined while it is superposed to comparatively large rotating or translating object motion. Interferometric methods such as pulsed TV holography might be suitable to measure the small transient deformation, but the often-large bulk motion makes the phase information disappear. However, by a combination of digital speckle photography (DSP) (also called digital image correlation) with pulsed TV holography, such measuring problems can be mastered. A method to calculate the bulk in-plane motion by DSP from the usual pulsed TV holography recordings and then to use this information to restore the interference phase is proposed. This technique may be attractive in the study of transient vibrations overlaid on rotating or translating motions.

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[1] M Sjödahl,et al. Three-dimensional deformation field measurements with simultaneous TV holography and electronic speckle photography. , 1997, Applied optics.

[2] M. Takeda,et al. Fourier-transform method of fringe-pattern analysis for computer-based topography and interferometry , 1982 .

[3] Mikael Sjödahl,et al. Electronic speckle photography: increased accuracy by nonintegral pixel shifting. , 1994, Applied optics.

[4] Staffan Schedin,et al. Transient acoustic near field in air generated by impacted plates , 1996 .

[5] Nils-Erik Molin,et al. Transient bending waves in plates studied by hologram interferometry , 1989 .

[6] Olov Marklund. Noise-insensitive two-dimensional phase unwrapping method , 1998 .

[7] S Schedin,et al. Phase evaluation and speckle averaging in pulsed television holography. , 1997, Applied optics.

[8] Karl A. Stetson. The use of an image derotator in hologram interferometry and speckle photography of rotating objects , 1978 .

[9] Giancarlo Pedrini,et al. Digital double pulse-TV-holography , 1997 .

[10] M Sjödahl,et al. Digital speckle-pattern interferometry: fringe retrieval for large in-plane deformations with digital speckle photography. , 1999, Applied optics.