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Sequence Capture & Particle Tracking
Particle Image Sequence

A sequence of images can be captured at video rate by the 4MEG VIDEO imaging board. With the 256 megabyte option, capturing RS-170 video at 30 fps, the 4MEG VIDEO can record 740 frames at 752x480 resolution, or 24.6 seconds of video! Images are captured with true pixel accuracy, neither compressed nor approximated, allowing detailed analysis of particle position or velocity.

Particle Image Sequence The 4MEG VIDEO also supports nonstandard cameras, allowing capture of sequences at higher frame rates, such as 9000 fps with a 32x32 DALSA, or higher resolution, such as a 2Kx2K Kodak.

After capture, the images can be analyzed by the 4MIP Interactive Software, which automatically finds and tracks particles across the image sequence. The tracking parameters can be adjusted to include only particles of a specified mass (area) or a specified velocity.

After analysis, the particle tracks are reported numerically, as well as shown overlaid on the image for convenient visualization.

The image shown is the first of a sequence of six, of a cylindrical reservoir containing a tubular heater which drives counter-clockwise rotating convention cells (courtesy of M. Wernet at the Nasa Lewis Research Center). Tracks of several particles are shown; an arrow head indicating the particle's future and final position, the opposite end indicating the initial position, and tick marks at the particle's intermediate positions.

Application Literature - Examples of Uses for EPIX Products

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