Twin-sensitivity measurement by spatial multiplexing of digitally recorded holograms.

We present an all-numeric multiplexing/demultiplexing technique for digitally recorded holograms that allow the simultaneous determination of the in-plane and the out-of-plane components of the displacement vector of an object submitted to some loading. The twin-sensitivity measurement is obtained from two different illumination directions that give two sensitivity vectors. The spatial multiplexing is achieved by an incoherent mixing of two duplets of coherent waves that produce holograms carried with orthogonal polarized reference waves. The spatial demultiplexing uses the autocorrelation function of the multiplexed holograms as a position estimator. The estimator then enables the determination of the pixel-to-pixel correspondence between the holograms for the double component determination. Results of the experiment are presented.

[1]  M. A. Kronrod,et al.  RECONSTRUCTION OF A HOLOGRAM WITH A COMPUTER , 1972 .

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

[3]  U. Schnars,et al.  Direct recording of holograms by a CCD target and numerical reconstruction. , 1994, Applied optics.

[4]  U. Schnars.  Direct phase determination in hologram interferometry with use of digitally recorded holograms , 1994 .

[5]  Giancarlo Pedrini,et al.  Digital double-pulse holographic interferometry using Fresnel and image plane holograms , 1995 .

[6]  G. Pedrini,et al.  Digital double-pulsed holographic interferometry for vibration analysis , 1995 .

[7]  H. J. Tiziani,et al.  Digital Double-Pulse Holographic Interferometry for Vibration Analysis , 1996 .

[8]  Ulf Schnars,et al.  Digital recording and numerical reconstruction of holograms: reduction of the spatial frequency spectrum , 1996 .

[9]  Werner P. O. Jueptner,et al.  Methods of digital holography: a comparison , 1997, Other Conferences.

[10]  Giancarlo Pedrini,et al.  Quantitative evaluation of two-dimensional dynamic deformations using digital holography , 1997 .

[11]  Stephan Waldner,et al.  Strain distributions made visible with image-shearing speckle pattern interferometry , 1997 .

[12]  H J Tiziani,et al.  Simultaneous quantitative evaluation of in-plane and out-of-plane deformations by use of a multidirectional spatial carrier. , 1997, Applied optics.

[13]  Ichirou Yamaguchi,et al.  Phase-shifting digital holography , 1997 .

[14]  H J Tiziani,et al.  Simultaneous three-dimensional dynamic deformation measurements with pulsed digital holography. , 1999, Applied optics.

[15]  E. Cuche,et al.  Digital holography for quantitative phase-contrast imaging. , 1999, Optics letters.

[16]  W. Osten,et al.  Digital recording and numerical reconstruction of lensless fourier holograms in optical metrology. , 1999, Applied optics.

[17]  E. Cuche,et al.  Spatial filtering for zero-order and twin-image elimination in digital off-axis holography. , 2000, Applied optics.

[18]  M. Gross,et al.  Numerical heterodyne holography with two-dimensional photodetector arrays. , 2000, Optics letters.

[19]  Pascal Picart,et al.  Error analysis for a Mach-Zehnder type speckle interferometer , 2001 .

[20]  Patrick Sandoz,et al.  High resolution digital holography , 2001 .

[21]  Pietro Ferraro,et al.  Wave front reconstruction of Fresnel off-axis holograms with compensation of aberrations by means of phase-shifting digital holography , 2002 .