透明結晶片群の平均光透過率
1966 年 35 巻 1 号 p. 29-33
詳細
1966 年 35 巻 1 号 p. 29-33
A method of measuring the average transparence of aggregation of small columnar crystals, such as gultamic acid soda (0.2_??_0.5mm thick and 0.5_??_2.2mm long) is introduced. The trans-parence is defined by the normal transmittance, T*, of closely distributed one layer crystals Since this is difficult to be realized, T* is calculated from measured transmittance values at two given acceptance angles obtained on a crystal layer discretely formed over a definite area on a glass plate by virtue of the transmittance being in linear relations with the weight of the crystals and the acceptance angle of less than 12 degrees, the latter relation being experimental. The value of T* is found nearly independent of the weight of the crystals provided they are in one layer, but depends slightly on the mean crystal size. With two kinds of samples apparently different in transparency, values of T* differ by 50% for crystals of the same size. The estimated weight of closely distributed crystals is found to be proportional to the mean thickness of crystals.
