On a Method of the Concentration Measurement by the Use of Light Absoption Law

Abstract

In order to detect the concentration of some material in a field, use is made of the light absorption method. The most importamt problem to be solved is the deviation from Lambert-Beer's law in the relation between photomultiplier output E^^∼_p and concentration value Γ^^∼ which appears under use of a broad band light source. An analysis is made of the deviation from Lambert-Beer's law, in consideration of various spectral characteristics of each optical element in the measuring system. A matching method is shown to make E^^∼_p - Γ^^∼ relation follow a simple power law over a broad range of the values of the concentration.