PIV Acquisition (PIVACQ) is a computer program for acquisition of data for particle- image velocimetry (PIV). In the PIV system for which PIVACQ was developed, small particles entrained in a flow are illuminated with a sheet of light from a pulsed laser. The illuminated region is monitored by a charge-coupleddevice camera that operates in conjunction with a data-acquisition system that includes a frame grabber and a countertimer board, both installed in a single computer. The camera operates in “framestraddle” mode where a pair of images can be obtained closely spaced in time (on the order of microseconds). The frame grabber acquires image data from the camera and stores the data in the computer memory. The counter/timer board triggers the camera and synchronizes the pulsing of the laser with acquisition of data from the camera. PIVPROC coordinates all of these functions and provides a graphical user interface, through which the user can control the PIV data-acquisition system. PIVACQ enables the user to acquire a sequence of single-exposure images, display the images, process the images, and then save the images to the computer hard drive. PIVACQ works in conjunction with the PIVPROC program — described in prior NASA Tech Briefs articles — which processes the images of particles into the velocity field in the illuminated plane.

This program was written by Mark P. Wernet of Glenn Research Center and H. M. Cheung of the University of Akron and Brian Kressler of Cornell University.

Inquiries concerning rights for the commercial use of this invention should be addressed to NASA Glenn Research Center, Commercial Technology Office, Attn: Steve Fedor, Mail Stop 4-8, 21000 Brookpark Road, Cleveland Ohio 44135. Refer to LEW-17373.

NASA Tech Briefs Magazine

This article first appeared in the November, 2003 issue of NASA Tech Briefs Magazine.

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