においの強度と濃度の間の相関に関する考察(第 4 報)

Abstract

As the means of expressing the odor intensity by a numerical value, the 6-point system has generally been employed together with the odor-concentration system; in the former, the intensity appreciated through olfactory sense is given by the figures ranging from 0 to 5,and in the latter, the concentration of an odorant that be no longer perceptible when diluted with odorless air. We investigated theoretically the relation between these two, taking into account the Weber-Fechner's rule, and derived Eq. (3), and further, we obtained Eq. (4) showing that the odor-concentration is proportional to the concentration of an odorant. In order to inquire into the validity of the equations, we applied them to the same data cited in the previous report, with the conclusion that the equations are considered to be well obeyed, in view of the difficulty in acquiring accurate results in a field work.