Correlation properties of heterodyned dynamic speckle in a two-lens imaging system and its application to two-dimensional velocity measurements

The space–time correlation function and its space- and time-integration effects of dynamic speckle in a two-lens imaging system superimposed upon a coherent laser light are analytically deduced. From considerations of the specific cases, two methods to perform two-dimensional velocity measurements in real time are proposed: a fringe method and a moment method. As a main result, it was found that the moment method has better spatial resolution than the fringe method.

[1]  T. Yoshimura,et al.  Space-time correlation function of spatially and temporally integrated laser speckle intensity in a two-lens imaging optical system , 1983 .

[2]  T. Yoshimura,et al.  Real-time measurements of spatial velocity distribution with a laser Doppler imaging system. , 1983, Applied optics.

[3]  J. Dainty,et al.  Correlation properties of light produced by quasi-thermal sources , 1983 .

[4]  James H. Churnside,et al.  Speckle from a rotating diffuse object , 1982 .

[5]  K. O'Donnell,et al.  Correlations of time-varying speckle near the focal plane , 1982 .

[6]  T. Yoshimura,et al.  Measurements of velocity distributions with a laser doppler imaging system , 1981 .

[7]  Toshimitsu Asakura,et al.  The Autocorrelation Function of the Speckle Intensity Fluctuation Integrated Spatially by a Detecting Aperture of Finite Size , 1981 .

[8]  Toshimitsu Asakura,et al.  Dynamic laser speckles and their application to velocity measurements of the diffuse object , 1981 .

[9]  Junji Ohtsubo,et al.  Velocity measurement using the time-space cross-correlation of speckle patterns , 1980 .

[10]  R. Barakat,et al.  Second-order statistics of speckle patterns observed through finite-size scanning apertures , 1978 .

[11]  N. Takai.  Contrast of time-averaged image speckle pattern for a vibrating object☆ , 1978 .

[12]  Ichirou Yamaguchi,et al.  Theory and applications of dynamic laser speckles due to in-plane object motion , 1977 .

[13]  P. Pusey.  Photon correlation study of laser speckle produced by a moving rough surface , 1976 .

[14]  J G McWhirter,et al.  Fluctuations in radiation scattered into the Fresnel region by a random-phase screen in uniform motion , 1976 .

[15]  T. Kishimoto,et al.  Real-time grey level display of velocity distributions on a surface. , 1976, Applied optics.

[16]  M. Ueda,et al.  Real Time Display of Velocity Distribution on a Surface by Using Ultrasonic Laser Light Frequency Shifter and TV System. , 1974, Applied optics.

[17]  M. Rousseau.  Statistical Properties of Optical Fields Scattered by Random Media. Application to Rotating Ground Glass , 1971 .

[18]  J. Allen,et al.  New Doppler holographic technique for fluid velocity visualization and measurement. , 1971, Applied optics.

[19]  J W Goodman,et al.  Temporal filtering properties of holograms. , 1967, Applied optics.