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In-line recording and off-axis viewing technique for holographic particle velocimetry

1995; Optica Publishing Group; Volume: 34; Issue: 11 Linguagem: Inglês

10.1364/ao.34.001827

0003-6935

Hui Meng, Fazle Hussain,

Aerodynamics and Acoustics in Jet Flows

Prior approaches (e.g., off-axis holography) to overcoming the limitations of in-line holography for particle fields, namely, intrinsic speckle noise and depth resolution, involved an increased complexity of the optical system. The in-line recording and off-axis viewing (IROV) technique employs a single laser beam to record an in-line hologram, which is then viewed off axis during reconstruction. The signal-to-noise ratio and depth resolution of IROV are higher than conventional in-line holography by an order of magnitude and are comparable with off-axis holography. IROV is a much simpler approach than off-axis holography and is highly promising for holographic particle velocimetry. Measurements of the three-dimensional flow velocity field of a vortex ring obtained by an IROV-based holographic particle velocimetry system are presented.