| 摘要 |
<P>PROBLEM TO BE SOLVED: To overcome the problem that a measured spectrum can not be compared and it is impossible to calculate a content rate of a particular component since a reference spectrum can not be set if a correct type of an object is not previously known although the content rate of the particular component contained in the object is obtained when a transmission spectrum and a reflection spectrum obtained by irradiating the object with a visual light and a near-infrared light from a wavelength-variable semiconductor laser light source are analyzed. Ž<P>SOLUTION: The spectrums and the content rates of the particular components of various types per target field are previously measured. A database is formed by using them, and stored in a card memory. The card memory associated with the corresponding field is set to a portable spectrum analyzer during a measurement. A computer sequentially compares a pattern of the measured spectrum with that of the spectrum in the database within the card memory, determines the most similar spectrum, automatically identifies the type of the object, and calculates the content rate of the particular component from a small difference between both spectrums. Ž<P>COPYRIGHT: (C)2010,JPO&INPIT Ž
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