Accession Number:

ADA222593

Title:

An Entropic Solution to the Particle Correspondence Problem

Descriptive Note:

Final rept. Jun 1988-Dec 1989,

Corporate Author:

ARMY BALLISTIC RESEARCH LAB ABERDEEN PROVING GROUND MD

Report Date:

1990-04-01

Pagination or Media Count:

30.0

Abstract:

An automatic tracking algorithm for particle-image velocimetry PIV has been developed that satisfactorily tracks 1000 or more identical particles. Time and storage requirements are modest, with a CPU time requirement of 7 sec for 100 particles and 300 sec for 1000 particles on the CRAY 2. The approach works from an artificial pairings matrix V sub ij that defines the identification of particle i in picture 1 with j in 2 by a value V sub ij 1. An entropy-modified distance measure of total particle movement is minimized by a standard Newton-Raphson technique. Values V sub ij are made to go to either 0 or 1 by the approach. As values V sub ij approach 1 they are removed from the problem, reducing problem size and CPU time requirements. jhd

Subject Categories:

  • Target Direction, Range and Position Finding

Distribution Statement:

APPROVED FOR PUBLIC RELEASE