Optics: measuring and testing – Velocity or velocity/height measuring – With light detector
Patent
1995-01-31
1997-03-11
Buczinski, Stephen C.
Optics: measuring and testing
Velocity or velocity/height measuring
With light detector
7386106, 364510, G01P 336, G01F 1712
Patent
active
056107030
ABSTRACT:
A digital particle image velovimetry (DPIV) method for contactless measurement of three dimensional flow velocities comprising the steps of seeding a flow with tracer particles; repeatedly illuminating a plane-like interrogation volume of the seeded flow; projecting the repeatedly illuminated interrogation volume onto at least a photo sensor in a projection direction for recording pictures of the illuminated interrogation volume; and determining the three dimensional flow velocities from the pictures of the repeatedly illuminated interrogation volume recorded by the photo sensor. The plane-like interrogation volume of the invention comprises at least two partial volumes positioned parallelly parallel to each other with regard to the projection direction. The step of repeatedly illuminating the interrogation volume comprises the step of illuminating the partial volumes in such a way that the pictures of different partial volumes are distinguishable from each other. The step of determing the three dimensional flow velocities of the flow comprises the steps of calculating a local autocorrelation function of a double exposed picture of the same partial volume, or calculating a local cross-correlation function between two separate pictures of the same partial volume, calculating a local cross-correlation function between two pictures of two different partial volumes, determining the sign of the out-of-plane component of the local flow velocities by using the location of a peak of the local cross-correlation function between the two pictures of the two different partial volumes, and determining the magnitude of the out-of-plane component of the local flow velocities by using the peak heights of peaks of both local correlation functions.
REFERENCES:
patent: 4866639 (1989-09-01), Adrian
patent: 5011278 (1991-04-01), Farrell
patent: 5424824 (1995-06-01), Daiber et al.
patent: 5469250 (1995-11-01), Holmes
patent: 5491642 (1996-02-01), Wormell et al.
Hofer Hans
Kompenhans Jurgen
Raffel Markus
Buczinski Stephen C.
Deutsche Forschungsanstalt fur Luft-und Raumfahrt e.V.
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