Sample gas analysis device, sample gas analysis method, and program for sample gas analysis

A sample gas analysis method using Fourier transform infrared spectroscopy, analyzing a concentration of a measurement target component in a sample gas by performing multivariate analysis using infrared absorption spectrum data obtained by irradiating the sample gas with light, the method comprising:

• calculating the concentration of the measurement target component in the sample gas by the multivariate analysis using library data including a plurality of spectrum data corresponding to a plurality of the measurement target components used for the multivariate analysis, wherein the sample gas includes a first component that is a measurement target component and a second component that is an interference component that coexists with the first component;
• and
• calculating the concentration of the first component from each peak position of the infrared absorption spectrum data and a corresponding height by multivariate analysis using, the infrared absorption spectrum data as part of the plurality of spectrum data, at least one of coexistence influence spectrum data of the first component having a spectrum shape changed due to a coexistence influence of the second component or coexistence influence spectrum data of the second component having a spectrum shape changed due to a coexistence influence of the first component, and in the coexistence influence spectrum data of the first component and the coexistence influence spectrum data of the second component, concentrations of the first component and the second component are known, respectively.

A non-transitory computer readable storage medium storing instructions of a program for sample gas analysis using Fourier transform infrared spectroscopy, the program being configured to analyze a concentration of a measurement target component in a sample gas by performing multivariate analysis using infrared absorption spectrum data obtained by irradiating the sample gas with light, the instructions, when executed by a computer, cause the computer to fulfill a function as:

• a library data storage configured to store library data including a plurality of spectrum data corresponding to a plurality of the measurement target components used for the multivariate analysis;
• and
• a concentration calculator configured to calculate the concentration of the measurement target component in the sample gas by the multivariate analysis using the library data stored in the library data storage, wherein
• the sample gas includes a first component that is a measurement target component and a second component that is an interference component that coexists with the first component,
• the library data storage stores, as part of the plurality of spectrum data, at least one of coexistence influence spectrum data of the first component having a spectrum shape changed due to a coexistence influence of the second component or coexistence influence spectrum data of the second component having a spectrum shape changed due to a coexistence influence of the first component, and
• the concentration calculator calculates the concentration of the first component from each peak position of the infrared absorption spectrum data and a corresponding height by multivariate analysis using at least one of the coexistence influence spectrum data of the first component or the coexistence influence spectrum data of the second component, and in the coexistence influence spectrum data of the first component and the coexistence influence spectrum data of the second component, concentrations of the first component and the second component are known, respectively.