Global to push GA events into
skip to main content

Title: Stereo multiplexed holographic particle image velocimeter

A holographic particle image velocimeter employs stereoscopic recording of particle images, taken from two different perspectives and at two distinct points in time for each perspective, on a single holographic film plate. The different perspectives are provided by two optical assemblies, each including a collecting lens, a prism and a focusing lens. Collimated laser energy is pulsed through a fluid stream, with elements carried in the stream scattering light, some of which is collected by each collecting lens. The respective focusing lenses are configured to form images of the scattered light near the holographic plate. The particle images stored on the plate are reconstructed using the same optical assemblies employed in recording, by transferring the film plate and optical assemblies as a single integral unit to a reconstruction site. At the reconstruction site, reconstruction beams, phase conjugates of the reference beams used in recording the image, are directed to the plate, then selectively through either one of the optical assemblies, to form an image reflecting the chosen perspective at the two points in time.
 [1];  [2];  [2]
  1. (Champaign, IL)
  2. (Urbana, IL)
Issue Date:
OSTI Identifier:
University of Illinois (Champaign/Urbana, IL) ORO
Patent Number(s):
US 5548419
Contract Number:
Research Org:
University of Illinois (Champaign/Urbana, IL)
Country of Publication:
United States
stereo; multiplexed; holographic; particle; image; velocimeter; employs; stereoscopic; recording; images; perspectives; distinct; time; perspective; single; film; plate; provided; optical; assemblies; including; collecting; lens; prism; focusing; collimated; laser; energy; pulsed; fluid; stream; elements; carried; scattering; light; collected; respective; lenses; configured; form; scattered; near; stored; reconstructed; employed; transferring; integral; unit; reconstruction; site; beams; phase; conjugates; reference; directed; selectively; reflecting; chosen; collimated laser; focusing lens; reference beam; scattered light; fluid stream; laser energy; particle image; particle images; reference beams; phase conjugate; integral unit; focusing lenses; image velocimeter; holographic particle; /359/