Duboscq 比色計による乾板の黒さ測定の試み

概要

論文の詳細を見る
There are many exquisite densitometers for the measurement of the photographic densities of plates and films, but they are too expensive for us and the authors tried with success to construct a simple densitometer by using an ordinary Duboscq-color-imeter. The principle is the same as when a Duboscq-colorimeter is used for the comparison of two liquids. In our case oue liquid is replaced by a photographic plate and the intensities of the light pencils transmitted through the plate and the standard liquid are matched with each other and the photographic intensity is read from the depth of the standard liquid, for which, after many trials, a suspension of carbon black of a moderate particle size was used with a small quantity of polyvinylalcohol as a stabilizer. As a yellow light filtered only by a solution of K_2Cr_2O_7 was used, which was not exactly monochromatic, it was necessary for us to use a carbon black of a moderatetsize, otherwise the color tones of the two light pencils compared do not matchor the suspension is too unstable. The area of the photographic, plate compared was some 0.8 mm^2. The accuracy of the instrument was ascertained to be the same order as that of the ordinary Duboscq-colorimeter.
山形大学の論文
1950-09-30