Non-destructive determination of fruit maturity by a resonant vibration technique

Prediction of Firmness and pH for “Golden Delicious” Apple Based on Elasticity Index from Modal Analysis

“…Contrast to the study in which acoustic impulse resonance frequency sensor was applied on apple fruit ‘Golden Delicious’ to predict fruit flesh firmness and SSC on tree and in shelf life (Zude, Herold, Roger, Bellon‐Maurel, & Landahl, ), it shown that prediction of fruit OG and pH value was possible in this study. Until now, little investigation was performed for building multiple regression to quantitatively predict the fruit quality after modal analysis (Hosoya et al., ; Sakurai et al., ) and some studies just focused on optimizing the method itself to create a superior test system for qualitatively discriminating the sample quality (Hitchman et al., ). Here, the quantitative analysis between the fruit quality parameters and the elasticity indices was realized.…”

“…The experimental modal analysis based on excitation‐response is a versatile vibration technology to identify the modal parameters, and has also been frequently used for nondestructive quality assessment of fresh fruit (Abbaszadeh et al., ; Hosoya, Mishima, Kajiwara, & Maeda, ; Mayorga‐Martínez, Olvera‐Trejo, Elías‐Zúñiga, Parra‐Saldívar, & Chuck‐Hernández, ; Sakurai, Terasaki, & Akimoto, ; Tantisopharak, Bunya‐athichart, & Krairiksh, ). The natural frequency of the fruit, as an easily tested modal parameter, was usually identified from the vibration signals acquired by the piezoelectric sensor (Iwatani, Akimoto, & Sakurai, ; Iwatani, Yakushiji, Mitani, & Sakurai, ), laser Doppler vibrometer (LDV) (Zhang, Cui, & Ying, ), laser ultrasound (Hitchman et al., ), or acceleration sensors (Xu et al., ) to calculate the elasticity index ( f 2 m 2/3 , where f is the natural frequency and m is the mass of the sample) for quality assessment.…”