Measurement example in the archives,
we introduce PIV measurement examples introduced at past web site of Seika Digital Image.
We measured the flow around the cube simulating the building in the large boundary layer wind tunnel by stereo PIV.
By combining the latest high-performance camera and analysis algorithm, it is possible to measure 2.5 m × 1.5 m area with high spatial resolution of 5 mm / vector with high accuracy.
By using a 120 mJ double pulse laser as the light source and placing two cameras at the forward scattering receiving position, it is possible to measure a wide area even with a comparatively low output light source.
Measurement Cooperation: Shimizu Corporation Research Institute
You can see by side scrolling.
Images of photographs can hardly resolve individual particles, but by utilizing the high-performance analysis algorithm installed in Koncerto, highly accurate analysis without peak locking even when measuring such a wide area Is possible.Smoothing filter etc… are not used.
You can see by side scrolling.
Overall Vector Diagram
Vector diagram enlarging the frame of the whole vector diagram
Measurement area size
|Camera||pco.1600-PIV (resolution 1600 × 1200 pixels)|
|Analysis algorithm||Image deformation, multi-pass, multi-window,
double correlation combined
Final search window size
|8 × 8 pixels
(Window size for calculating 1 speed vector)
|Average particle diameter||About 1 micron|
Confocal scanning Micro PIV: Measurement of micro droplet internal flow
The capsule-like micro droplet moving inside the microchannel with a width of 100 μm and a depth of 100 μm was divided into six sections and precise measurement was performed.Inside the droplet, it turned out that three-dimensional and complicated internal flow has occurred due to the influence of the wall surface of the microchannel.The confocal scanning micro PIV system enabled this measurement.
Data provided: The University of Tokyo Production Technology Laboratory, Oshima laboratory
■ Confocal scanning Time series micro PIV
■ High Speed Objective Actuator
■ Refractive index matching
Comparison of general Normal fluorescence image and confocal image
Regular fluorescence microscopy images, regardless of how much the depth of focus is reduced by using a high-performance objective lens, scattered light from the particles around the focal plane will appear and the background will brighten.
If confocal scanner is used, in principle, scattered light from particles around the focal plane is blocked, and a clear particle image with high contrast can be obtained.
State of micro droplets moving within the microchannel (100 × 100 μm)
The part in contact with the wall is dragged by the wall and the speed is slow.You can see that it is faster than the traveling speed of the droplet at the corner where it is not in contact with the wall so as to compensate for the slowed speed.
The velocity distribution inside the micro droplet moving within the microchannel (100 × 100 μm)
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