Laser speckle imaging

Details Laser speckle imaging Laser speckle imaging

1987-06-25

1988-12-20

Willis, Davis L.

Optics: measuring and testing

By dispersed light spectroscopy

Utilizing a spectrometer

364525, 382 54, G01B 902

Patent

active

047922311

ABSTRACT:
Satellite imaging through a turbulent atmosphere is provided at better than turbulence-limited resolution using laser speckle statistics on reflections of orthogonal spatially periodic illumination patterns. The second harmonic of a covariance function of phase provides the phase difference between nearby spatial frequencies. By summing such phase differences over many spatial frequencies a spectral phase distribution of an image can be obtained. A spectral intensity distribution can be obtained using laser speckle statistic during uniform illumination of the target. The combined intensity and phase spectral distributions can be inverse Fourier transformed to obtain the desired image.

REFERENCES:
Fontanella et al., JOSAA, Series 2, vol. 4, No. 3, pp. 438-448, 3/87.
Weigelt, "Modified Astronomical Speckle Interferometry `Speckle Masking`", Opt. Commun., vol. 21, pp. 55-59, 1977.

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