Stroboscopic real-time holographic interferometry with photorefractive crystals applied to modal analysis

A breadboard holographic interferometer that uses a photorefractive sillenite crystal under the anisotropic diffraction configuration is presented for application of quantitative vibration measurements. After the hologram of the object at the rest is recorded, a stroboscope is used to observe the stable pattern of the vibrating object and phase-shifting is introduced for quantitative measurements. It is shown that this system can measure modal displacements of objects of typically 25 X 25 cm2 with high accuracy by using a continuous YAG laser emitting 490 mW at 532 nm. The error sources are investigated and particularly a systematic error arising from the stroboscopic process can be calculated and eliminated.

[1]  Sridhar Krishnaswamy,et al.  Real-time visualization of dynamic holographic interferometric images using photorefractive crystals , 1996, Optics & Photonics.

[2]  M. Georges,et al.  Phase-shifting real-time holographic interferometry that uses bismuth silicon oxide crystals. , 1995, Applied optics.

[3]  Marc P. Georges,et al.  Holographic interferometry using photorefractive crystals: recent advances and applications , 1996, Other Conferences.

[4]  J C Dainty,et al.  Holographic interferometry using anisotropic self-diffraction in Bi(12)SiO(20). , 1991, Optics letters.

[5]  Thomas W. Bushman,et al.  Phase unwrapping by least squares error minimization of phase curvature , 1993, Optics & Photonics.

[6]  Mikhail P. Petrov,et al.  Continuous reconstruction of holographic interferograms through anisotropic diffraction in photorefractive crystals , 1985 .

[7]  Karl A. Stetson,et al.  Fringe-shifting technique for numerical analysis of time-average holograms of vibrating objects , 1988 .

[8]  G. von Bally,et al.  Holographic double-exposure interferometry in near real time with photorefractive crystals , 1994 .

[9]  J. Dainty.  Photorefractive Crystals in Coherent Optical Systems , 1993 .

[10]  P. Hariharan,et al.  Stroboscopic holographic interferometry: Application of digital techniques , 1986 .

[11]  J. P. Herriau,et al.  Time average holographic interferometry with photoconductive electrooptic Bi(12)SiO(20) crystals. , 1977, Applied optics.

[12]  C. Vest.  Holographic Interferometry , 1979 .

[13]  S Krishnaswamy,et al.  Dynamic holographic interferometry by photorefractive crystals for quantitative deformation measurements. , 1996, Applied optics.

[14]  Marc P. Georges,et al.  Holographic interferometry using photorefractive crystals for quantitative phase measurement on large objects , 1996, Electronic Imaging.

[15]  G. von Bally,et al.  Phase shifting holographic double exposure interferometry with fast photorefractive crystals , 1997 .

[16]  H. Saito,et al.  Vibration Measurement Using Phase-shifting Stroboscopic Holographic Interferometry , 1986 .