新規なくさび形配置二枚ガラスセルでの光干渉における位相変化を信号とする化学分析用計測器の開発

概要

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We carried out the development of a general-purpose optical interference-type chemical instrument that responds to the refractive index. Toward the determination of a unique solution concentration, high sensitivity and high accuracy, as well as response to a sample solution with a continuously and fast-changing concentration, the phase of interference fringe was adopted as signal. A new sample cell and interferometer consisting of two pieces of glasses placed in a wedge conformation was devised; further, the sample cell was miniaturized. The use of the new sample cell and interferometer consisting of two pieces of glasses placed in a wedge conformation successfully compensated for any signal fluctuations due to a laser instability etc. This measurement system correctly responded to the concentration. The phase change is roughly proportional to the concentration in the region from 0 to 0.3% aqueous solution of ethanol, and detection limit was determined to be 0.022%. This was comparable to that of a commercially available refractive index meter. The system responded quantitatively correctly to continuous and fast changes of the sample concentration to follow almost in time, which showed the possibility of real-time measurements up to a rate of 0.0024% s−1. Measurements of Ni(CH3COO)2 were successfully carried out. Although it is necessary to study each case, the applicability for a coloring substance has been suggested.