Uses the fourier transform infrared spectrometer the quantitative analysis manner

摘要

PURPOSE:To analyze even a component to be measured having high concentration with the minimum detecting sensitivity being maintained at a constant level and to make it possible to perform continuous analysis even for a samples to be measured whose concentration change is large by automatically switching the groups of wave-number points used for the concentration computation of the component in response to the magnitude of the concentration of the component to be measured. CONSTITUTION:The group of wave-number points used for concentration computation corresponding to the concentration range based on the spectrum data obtained from a Fourier- transformation infrared spectrophotometer is used, and operation is performed. Whether the computed value can be outputted or not is compared with a threshold value. When the concentration range which is set by the computed value is judged as adequate, the computed value is outputted as the computed value of the concentration. When the range is not adequate, the concentration range is changed and set at the adequate value. The operation is performed again based on the absorbance of the group of the wave-number points for the corresponding concentration computation. These computation, judgment and change of range are all performed with computers automatically. Only the result of the concentration computation based on the group of the wave-number points for the most adequate concentration computation is always outputted in this way.