A photorefractive crystal (Bi_12GeO_20) is used to record double-exposure speckle patterns
produced by Q-switched laser pulses in real-time speckle metrology and velocimetry …

A two-beam coupled photorefractive novelty filter is presented for real-time measurement of
displacement components. In the optical configuration, the BaTiO 3 crystal is oriented such …

The present work describes the use of a photorefractive correlator in the measurement of in-
plane displacement. A correlation technique has been proposed and demonstrated for …

A technique has been proposed for the measurement of tilt of a diffuse object using speckle
fanning in a photorefractive BaTiO3 crystal. Free space geometry has been used for …

Photorefractive crystals offer several attractive features such as high resolution and in situ
processing. As the images are erasable, these crystals are suitable for read–write …

Two-beam coupling in BaTiO 3 crystal is suggested for the tracking novelty filtering in
speckle metrology. Two schemes are discussed: one for point measurement of displacement …

A new real-time phase-shifting readout system is developed for quantitative evaluation of full-
field correlation fringes obtained by means of Fourier filtering in speckle photography. The …

A technique is proposed for the real-time measurement of in-plane displacement utilizing
objective speckles and two-beam coupling in a photorefractive BaTiO3 crystal. Speckles …

Extraction of displacement or velocity data from laser speckle photography or particle image
velocimetry transparencies requires measurement of the spacing and orientation of several …

The polarization properties of diffraction from bismuth silicon oxide crystals are used to
enhance the signal-to-noise ratio of a photorefractive particle image velocimeter. We explain …