Absorbance and Transmittance Capability of Mangoes, Grape and Orange in NIR Region

This paper focuses on the usage of absorption and transmission properties in the near infra red (NIR) spectrum for quality monitoring of fruits particularly mangoes, grapes and oranges. These three fruits are classified into climacteric and non-climacteric, and analyzed in terms of its absorbance and transmittance capabilities. Experimental works are mainly performed in the study with some preliminary results in fruit ripeness detection. In comparison, climacteric fruits are less tendencies to absorb or transmit light. The non-climacteric fruits display more absorptive power and higher transmission ability. Grape populated as the best in this work due to its thinner and partially transparent skin. Absorbance in grapes starts as early as at 365 nm. Grapes also shows a slight increase in its spectra due to volume of the seeds. However, it does not observed in oranges because the seeds volume is smaller than the total volume of orange. Unriped mangoes give the smallest transmittivity