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ALA
stands for "As Large As." The algorithm takes the area of each grain and
applies the ASTM grain size formula to determine the 'ALA' grain sizes for all
the grains in the image (except those touching the edges). Originally ALA
was used to extract the equivalent grain size for the largest grain in the
image. See ASTM specifications E 112, E 930 and E 1382. The formulas
for doing the equivalent grain size calculation are in these specs. MatPro
calculates all the equivalent grain sizes.
Note: the statistics of ALA calculations and those of the normal
grain size measurement will not be equal. The mean size from ALA
calculations takes the mean of log data, whereas the normal grain size
measurement is taking the log of the mean data. The log of the mean and
the mean of the log will produce different final results.
Lou
Marek
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