Abstract
In this Laser speckle velocimetry, four interrogation windows with different concentration of seeded particles support and progresses the measurement of instantaneous velocity of flow. A laser sheet illuminated micron size seeded particles, gives a moving pattern at the recording plane. Double frame/single exposure laser speckle images are captured, in such a way that second speckle image was shifted exactly in a known direction. But in the case of auto-correlation process, there is a problem of directional ambiguity of flow. To rectify this, spatial shift of second image designed and cross correlation by Fast Fourier Transform technique has been adopted. Correlation strength escalate by reducing in-plane loss by middling displacement of seeded particles.
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