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Abstract

A spectrophotometer, for online non-destructive optical examination of fruit or vegetables or the like avoids saturation of the data level, or the data level being too small, due to changes in rate of feeding or variation in the fruit or vegetables. Light that has passed through the fruit or other article is divided into different spectral components and received at two locations, a main light reception unit and a sample-use light reception unit. A digital value obtained from the sample-use light reception unit is compared with a predetermined reference value, Based on this comparison, the gain of a variable gain amplification circuit is set to an optimum value. The signal from the main light reception unit is passed through the variable gain amplification circuit, a zero-point correction circuit, and an A/D converter, to obtain digital data to be read for obtaining suitable wavelength characteristic data.

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First Claim