Imaging transverse flow velocity using spectral bandwidth of...

Data processing: measuring – calibrating – or testing – Measurement system in a specific environment – Mechanical measurement system

Reexamination Certificate

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Reexamination Certificate

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06944551

ABSTRACT:
The Doppler bandwidth extracted from the standard deviation of the frequency shift in phase-resolved optical Doppler tomography (ODT) is used to image the velocity component transverse to the probing beam. The effective numerical aperture (NA) of the optical objective determines the slope of the dependence of the standard deviation on velocity. In the case where the angle between the probing beam and flow direction is within ±15 degrees to the perpendicular, the Doppler frequency shift is very sensitive to angle position while the Doppler bandwidth is insensitive to flow direction. Linear dependence of the flow velocity on the Doppler bandwidth allows accurate measurement of flow velocity without precise determination of flow direction. In addition, it also extends the dynamic range of the average frequency shift mapping method used in the phase-resolved ODT.

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Wang et al., “Characterization of fluid flow velocity by optical Doppler tomography”, Opt. Letter, 20:1337-1339, Jun. 1, 1995.
Chen et al., “Optical Doppler tomographic imaging of fluid flow velocity in highly scattering media”, Opt. Letter, 22:64-66, Jan. 1, 1997.

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