Arrangement for optical autocorrelation

Details Arrangement for optical autocorrelation Arrangement for optical autocorrelation

1995-02-28

1996-12-03

Sikes, William L.

Liquid crystal cells, elements and systems

Particular structure

Having significant detail of cell structure only

359559, 359561, 356345, 364822, 382278, 382211, 382209, C02F 1135, G01B 902, G06E 300

Patent

active

055813836

ABSTRACT:
An arrangement for optical autocorrelation of laser speckle photography (LSP) photographs or particle image velocimetry (PIV) photographs using optical Fourier transforms is disclosed. The object of providing an electro-optical arrangement for optical correlation of LSP film recordings and PIV film recordings which is simple to produce and accurate is met by using an optically addressable liquid crystal SLM (spatial light modulator) for producing the Young's fringe patterns which contains a uniaxial double-refracting liquid crystal layer and is read out with linearly polarized light of a laser light source, wherein the polarization direction of the laser light source on the readout side coincides with the extraordinary semi-axis of the refractive index ellipsoid of the liquid crystal layer.

REFERENCES:
patent: 4018509 (1977-05-01), Boswell et al.
patent: 4695973 (1987-09-01), Yu
patent: 5367579 (1994-11-01), Javidi et al.
"Particle Image Velocimetry Processing using an Optically Addressed Spacial Light Modulator", Sharpe et al, Applied Optics, Dec. 10, 1992 vol. 31 #35 pp. 7399-7402.

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