Analysis device, program for analysis device, and analysis method

A non-transitory computer readable medium storing a program applied to an analysis device that includes a light source that irradiates a sample, including one or more interference components, with reference light, and a photodetector that detects sample light having transmitted through the sample, the program causing the analysis device to implement functions as:

• a parameter determining unit that determines a parameter representing a change in a light absorption spectrum of a target component or a change in a light absorption spectrum of an interference component, the change being caused by a coexisting component included in the sample or by a wavelength shift of the reference light;
• a concentration calculating unit that calculates a corrected concentration of the target component, from an intensity-related signal related to an intensity of the sample light, by using the parameter representing the change in the light absorption spectrum;
• a correlation value calculating unit that calculates a correlation value between the intensity-related signal related to the intensity of the sample light and a predetermined feature signal, and that calculates a plurality of correlation values using a number of feature signals equal to or more than a sum of a number of types of the target component and a number of types of the interference component;
• and
• a storage unit that stores a sole correlation value that is a correlation value between a per unit concentration of the target component and a per unit concentration of each of the one or more interference components, the sole correlation value being obtained from the intensity-related signal when only the corresponding interference component exists with the target component, and from the number of feature signals, wherein
• the concentration calculating unit calculates a corrected concentration of the target component, the corrected concentration being corrected for a coexistent effect of the coexisting component or for the wavelength shift of the reference light, using a plurality of correlation values obtained by the correlation value calculating unit, a plurality of the sole correlation values, and the parameter representing the change in the light absorption spectrum of the target component or the changes in the one or more interference components.

An analysis method for analyzing a target component included in a sample including one or more interference components, by using a light source that irradiates the sample with reference light, and a photodetector that detects sample light having transmitted through the sample, the analysis method comprising:

• determining a parameter representing a change in a light absorption spectrum of the target component or a change in a light absorption spectrum of an interference component, the change being caused by a coexisting component included in the sample or by a wavelength shift of the reference light;
• calculating a corrected concentration of the target component, from an intensity-related signal related to an intensity of the sample light, by using the parameter representing the change in the light absorption spectrum;
• calculating a correlation value between the intensity-related signal related to the intensity of the sample light and a predetermined feature signal;
• calculating a plurality of correlation values using a number of feature signals equal to or more than a sum of a number of types of the target component and a number of types of the interference component;
• storing a sole correlation value that is a correlation value between a per unit concentration of the target component and a per unit concentration of each of the one or more interference components, the sole correlation value being obtained from the intensity-related signal when only the corresponding interference component exists with the target component, and from the number of feature signals;
• and
• calculating a corrected concentration of the target component, the corrected concentration being corrected for a coexistent effect of the coexisting component or for the wavelength shift of the reference light, using a plurality of correlation values obtained by the correlation value calculating unit, a plurality of the sole correlation values, and the parameter representing the change in the light absorption spectrum of the target component or the changes in the interference components.