Subsequent Analysis

Contents

Concept
DigImage: Particle Tracking
:::: IMAGE CAPTURE
:::: PARTICLE LOCATION
:::: PARTICLE MATCHING
:::: OPERATION
Subsequent Analysis
:::: STRUCTURE OF FILES
:::: BASIC OPERATION OF TRK2DVEL
:::: CONFIGURATION OF TRK2DVEL
:::: FACILITIES
Advanced Features
:::: PARTICLE-TAGGED DATA
:::: IMAGE PREPROCESSING
Experimental Hints
Index

3 Subsequent Analysis

Tracking the particles is only a small part of the experimental analysis. It will almost always be necessary to summarise the data obtained from the tracking procedure. This summarisation may take the form of graphical output, or statistics of the flow. The precise nature of the required data will depend on the type of experimental problem being analysed and the aspects of the flow in which the user is interested. Unfortunately it is not possible to produce a single program to analyse the tracking data in exactly the way required for every conceivable use. Instead it will be up to the user to devise suitable analyses for some of the problems they encounter, using the basic tools provided with DigImage.

Goto next document (FileStructure) Among the utilities supplied with all versions of DigImage is a reasonably extensive analysis package called Trk2DVel. The purpose of this package is two-fold: first it provides ready access to a number of the most commonly required analyses, and second it may be used as a template on which further methods of analysis may be developed. For this reason most of the source for Trk2DVel is supplied (in Fortran 77) in addition to all required object modules and an executable version.

The next section, §3.1 , details the structure of the .IND and .PRT tracking files, while the following section, §3.2, outlines the main routines which should be used to obtain velocity-position-time data from the files. Further, more detailed information may be found in Document\Trk2Code.DOC.

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PARTICLE TRACKING

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