Analysis device

An analysis device that analyzes measurement target components contained within a sample that contains one or more interference components, comprising:

• a cell into which the sample is introduced;
• a plurality of light sources including at least a first light source, a second light source, and a third light source, wherein each of the plurality of light sources outputs light at a mutually different timing;
• an optical system that guides light from the respective light sources onto the cell;
• a photodetector that detects an intensity of light that is transmitted through the cell;
• and
• a signal processing device that calculates a concentration of the measurement target components on an intensity-related signal related to the intensity of light detected by the photodetector, wherein the optical system comprises:
• a first light source reflection mirror that reflects the light from the first light source;
• a second light source optical element that reflects the light from the first light source that has been reflected by the first light source reflection mirror and transmits the light from the second light source;
• a second light source reflection mirror that reflects the light from the first light source that has been reflected by the second light source optical element and the light from the second light source that has been transmitted through the second light source optical element;
• and
• a third light source optical element that reflects the light from the first light source and the light from the second light source that have been reflected by the second light source reflection mirror, and transmits the light from the third light source, wherein the light from the first light source is guided onto the cell by sequential reflection without having been transmitted through the second light source optical element and the third light source optical element to prevent reduction in intensity of the light from the first light source, wherein the light from the second light source is guided onto the cell by transmission through the second light source optical element and sequential reflection without having been transmitted through the third light source optical element to prevent reduction in intensity of the light from the second light source, wherein the light from the third light source is guided onto the cell by transmission through the third light source optical element and sequential reflection to prevent reduction in intensity of the light from the third light source, and wherein the signal processing device comprises:
• a correlation value calculation portion that calculates correlation values between intensity related signals that relate to the intensity of the light detected by the photodetector and feature signals from which a predetermined correlation with the intensity related signals is able to be obtained;
• a concentration calculation portion that calculates concentrations of the measurement target components using the correlation values obtained by the correlation value calculation portion;
• and
• a storage portion that stores individual correlation values which are the respective correlation values per unit concentration for the measurement target components and each interference component determined from the respective intensity related signals and the feature signals in a case in which the measurement target components and each of the interference components are present individually, and
• the concentration calculation portion calculates concentrations of the measurement target component based on the correlation values obtained by the correlation value calculation portion, and on the individual correlation values stored in the storage portion.