| 摘要 |
In a microcapsule having a wall of a refractive index n1, a thickness-determining apparatus comprises at least (i) a sensor 1 for detecting a light scattering intensity data I1 with respect to a microcapsule dispersed in a medium having a refractive index n1, and a light scattering intensity data I2 with respect to a microcapsule dispersed in a medium having a refractive index n2; (ii) a memory circuit 3 for storing a theoretical equation correlating a light scattering intensity characteristic with a particle size; and (iii) an arithmetic circuit 5 for calculating an inner diameter r1 and an outer diameter r2 from the theoretical equation based on the light scattering intensity data I1 and I2, and calculating a wall thickness. In such an apparatus, since the refractive index of the medium conforms to the refractive index of the wall, the inner diameter can be calculated by a simple theoretical equation, and the wall thickness can be conveniently or certainly determined without destroying the wall by cutting.
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