| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a method and instrument for measuring an oxygen diffusion coefficient even when liquid water is contained in a porous body. <P>SOLUTION: A porous body holder 3 is attached to a negative electrode 5 of a galvanic battery-type oxygen sensor 2 while the porous body 1 with liquid water impregnated thereinto is held in the vicinity of the oxygen sensor 2 in a tubular part 3b of this holder 3. This measurement instrument 10, comprising the oxygen sensor 2 with the porous body 1 held thereon and the holder 3, is mounted on an electronic force balance 15 and housed in an airtight container 14. Here, the liquid water impregnated into the porous body 1 gradually evaporates while oxygen included in air in the airtight container 14 permeates the porous body 1. Its permeation amount is detected by the oxygen sensor 2 to calculate the oxygen diffusion coefficient of the porous body 1 by using an output from the oxygen sensor 2. Further, the mass of remaining liquid water without evaporating from the porous body 1 is measured by using the balance 15 to calculate the water content percentage of the porous body 1. <P>COPYRIGHT: (C)2007,JPO&INPIT |
