Optics: measuring and testing – Velocity or velocity/height measuring – With light detector
Patent
1994-06-20
1996-07-02
Hellner, Mark
Optics: measuring and testing
Velocity or velocity/height measuring
With light detector
356 28, 356337, 356347, G01P 336
Patent
active
055328148
ABSTRACT:
A Holographic Diffraction Image Velocimetry (HDIV) providing the three-dimensional (3-D), three-component (3-C) detection of velocity or displacement field. The HDIV technique and system are based on the independent reconstruction of time-sequence scenes captured on a single recording plate by dual-reference-beam, off-axis holography. The local areas of individual images, without any specific-particle focusing, are then scanned section by section with a solid state camera to obtain sufficient readout resolution. For velocity extraction, the image section that best correlates to the original image in a plane window is computationally searched from a transplaced volume window in the displaced field. Initially, in-plane motion is found statistically by applying two-dimensional cross-correlation (CC) to the middle section of the volume window, obtained with an intermediate depth of focus of the imaging system. Out-of-plane displacement is then located by cross-product, that is, by directly comparing the original image section with the sections along the optical axis at the in-plane displacement position, with a short depth of focus. The HDIV technique allows experimental freedom and post-control in data acquisition with reconstructed images. It can cover an extended region with high resolution and accuracy through utilization of high-density fine seed-particles. Its computation processing can further enhance performances without velocity sign ambiguity.
REFERENCES:
patent: 4919536 (1990-04-01), Komine
patent: 5333044 (1994-07-01), Shaffer
Malyak et al; Particle Displacement and Velocity Measurement Using Holography; Optical Engineering 1 Sep./Oct. 1984/vol. 23 No. 5 pp. 567-596.
Bryanston-Cross et al; Quantitative Analysis of Holographic Particle Data; Optics and Lasers in Engineering 18(1993) pp. 267-279.
Meng et al; Holographic Particle Velocimetry: A 3D Measurement Technique for Vortex Interactions, Coherent Structures and Turbulence Fluid Dynamics Research 8 (1991) 33-52.
LandOfFree
Holographic diffraction image velocimetry for three-dimensional does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Holographic diffraction image velocimetry for three-dimensional , we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Holographic diffraction image velocimetry for three-dimensional will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1511126