In addition to pioneering the use of two-dimensional PIV techniques for dusty plasma studies, the PSL also first adapted stereoscopic (three-dimensional) PIV techniques for dusty plasma studies.
The stereo-PIV technique is generally the same as two-dimensional PIV, but with the addition of a second camera. The two cameras, now oriented at an angle with respect to the laser sheet, now give two slightly different view of the particle clouds. Through a calibration procedure using a "standard" target, the images from each camera (two image from each camera, 4 images total) are combined to generate three-dimensional velocity vectors.
Above: Photograph of the 3DPX device and stereo-PIV system. The two PIV cameras are in blue at the center of the image. The laser is a gray box with the thick black tube coming out of the back end. The entire stereo-PIV system is mounted on a translation stage (light gray metal in the photo) that moves the laser/camera assembly back and forth.
Click HERE for a link to one of the first stereo-PIV measurements.
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