Otsuka Electronics Co., Ltd.

Konomu Hirao

Naoki Inamoto

Using optical measurement data obtained from a light-diffusive object the percentage absorption %ABS of the object is calculated, and using one constant or a multiple constant n.sub.i (.sub.i =1,2, . . .) the spectrum waveform is calculated according the equation as follows:

Absorption spectrum determining method and spectrometric measuring

The present invention utilizes the difference of light reception data generated based on the difference in length of substantial optical diffusion paths between a single light receiving point and a plurality of irradiation points, or between a plurality of light receiving points and a single irradiation point. According to the present invention, the inside information of substance based on the difference in length of the optical diffusion paths, may be measured. Even though measurements are made under different measuring conditions as to the part to be measured, the measuring time, etc., there may be obtained reliable measured data of the inside information with good reproducibility.

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Ibaraki, Japan

Konomu Hirao