PROBLEM TO BE SOLVED: To provide a method for evaluating transparency capable of objectively and precisely evaluating the transparency.SOLUTION: The method evaluates the transparency as follows: a first irradiation region and a second irradiation region in an object are irradiated with light, and receives emission light returning from the first irradiation region and the second irradiation region, then the transparency is evaluated by comparing the respective irradiation light amount to the first irradiation region and the light amount to the second irradiation region with the respective emission light amount emitted from the first irradiation region and the second irradiation region. An area ratio of the measurement region of emission light from the second irradiation region to the second irradiation region (area of measurement region/area of irradiation region) is made smaller than the area ratio of the measurement region of the emission light from the first irradiation region to the first irradiation region (area of the measurement region/area of the irradiation region).COPYRIGHT: (C)2010,JPO&INPIT【課題】透明性を客観的に精度良く評価することができる方法の提供。【解決手段】本発明は、対象における第1の照射領域と第2の照射領域とにそれぞれ光を照射し、第1の照射領域及び第2の照射領域から戻って来る射出光を受光して、第1の照射領域及び第2の照射領域へのそれぞれの照射光量と第1の照射領域及び第2の照射領域から射出されるそれぞれの射出光量とを比較して透明性を評価する。第2の照射領域に対する第2の照射領域からの射出光の測定領域の面積比(測定領域の面積/照射領域の面積)を、第1の照射領域に対する第1の照射領域からの射出光の測定領域の面積比(測定領域の面積/照射領域の面積)に比べて小さくする。【選択図】図1
