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Abstract. This work focuses on the nondestructive fruit ripeness detection system at different maturity stages. The study involved a computational approach whereby the detector is simulated and characterized. The development of the 2 dimensional finite elements provides deeper understanding in an isotropic media of the sensor. The paper presents a sensitive layer of the zinc oxide with a thickness of 0.5 µm on LiNbO3 piezoelectric substrate for ethylene (C2H4) gas sensing application in order to distinguish maturity level of fruits. In addition the sensor acts as a better device for sensing the amount of ethylene gases that releases from mature fruits.

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.

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This work focuses on the nondestructive fruit ripeness detection system at difference maturity stages. The study involved a two-step approach which is the absorption and reflection spectral analysis. In this system, light dependent resistor (LDR) is used as the light sensor and displayed on the LCD screen of its resistivity. Portable spectrometer is adopted for measuring the reflection and absorption before processed by simple electronic Arduino-based circuit. The results of the photonic ripeness detection system show that the ripe fruit has higher light reflection rate in comparison to the unripe fruit. If the average value of the resistance is in between 400-600 the fruit is classified as still in immature period. Where as the resistance of 610-800 indicates the fruit is matured. The growth of fruit determines the difference ripeness levels and its resistivity too.