| 摘要 |
A sample 10 of a composite material, such as a graphite-epoxy composite, is exposed to radiation in three distinct energy bands emanating from sources 12, 13 and 14, respectively. Corresponding detectors 16, 17 and 18 are positioned to measure the amount of energy in each band transmitted through the sample. Weight percentages of three different constituents of the sample 10 are calculated from a relatively simple algorithm whose variables include a ratio for each of said energy bands of the amount of energy that would be detected if the sample were not present in the radiation to the amount of energy transmitted through the sample when the sample is exposed to the radiation.
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