| 摘要 |
PROBLEM TO BE SOLVED: To provide a correction method of a calibration curve which fixes a reference spectrum to predict the optical path length from a sample spectrum and corrects the spectrum, using the predicted optical path length that can neglect the fluctuations due to the individual differences of vials. SOLUTION: On the basis of the sample spectrum measured by the vial or cell known in its optical path length, the ratio of the specific wave number ranges of the reference spectrum, and the measured spectrum is calculated by the method of least squares to determine the measuring optical path length, while the measured spectrum is converted into a spectrum measured by using the same optical path length as the reference spectrum to form the calibration curve. The ratio of the specific wave number range of the spectrum of an unknown sample to that of the reference spectrum is calculated by the method of least squares, to deduce the optical path length; and after the optical path length has been converted into the spectrum of a reference optical path length, the concentration and properties of the sample are deduced by using a preliminarily produced calibration curve. COPYRIGHT: (C)2007,JPO&INPIT
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