| 摘要 |
A measurement apparatus is disclosed in which a barrier (2) separates a chamber into a first region (10) and a second region (20). The barrier (50) is of a known thickness (T), and it comprises holes having a known radius (R). Gas flow means provide a flow of a carbon dioxide (12) in the first region (10) and a flow of a nitrogen (22) in the second region (20). A gas detector (28) measures the concentration of carbon dioxide in the second region (20) and a processor (32) calculates the theoretical diffusive flux from one region to another based on the known properties of the through-holes. The processor (32) is arranged to calculate a calibration parameter in order to relate the measured parameter to the theoretical diffusive flux, based on the known properties of the through-holes.
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