Application of time-of-flight near infrared spectroscopy for detecting sugar and acid contents in apples
2004
Tsuchikawa, S. | Hamada, T.
A newly constructed optical measurement system was introduced to nondestructively measure the composition of the inside of an apple by time-of-flight near-infrared spectroscopy (TOF-NIRS). As sugar content increased, optical parameters concerned with time-resolved profile of transmitted pulsed light (the attenuance of peak maxima, At, the time delay of peak maxima, deltat, and the variation of full width at half-maximum, deltaw) decreased gradually. When the acid content increased, At and deltaw increased; however, a significant tendency could not be found for deltat. At, deltat, and deltaw were employed as the explanatory variables for multiple linear regression, principle component regression, and partial least-squares analysis. It was possible to predict both sugar and acid contents in an apple with high precision by TOF-NIRS. Especially, the superiority of TOF-NIRS lied in more precise determination of acid content.
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