Design, Fabrication and Test of Integrated Acoustic-Vibration Fruit Texture Analyzer

Document Type : Research Paper

Authors

1 PhD Student in Biosystems Engineering, Department of Agrotechnology, Abouraihan Campus, University of Tehran, Tehran, Iran

2 Associate Professor, Department of Agrotechnology, Abouraihan Campus, University of Tehran, Tehran, Iran

3 Professor, Department of Agrotechnology, Abouraihan Campus, University of Tehran, Tehran, Iran

Abstract

    Using the  acoustic response analysis is one of the non-destructive methods to determine the texture quality and firmness of fruits such as apples, pears, peaches and other crops such as watermelon, melon and cantaloupe. In this study, a portable device designed and fabricated which has a pendulum to apply the computer-controlled impact to the sample, to investigate the non-destructive quality of apple fruit based on firmness. When pendulum hits the sample, both the acoustic and vibration sensors simultaneously receive the impact signals and after transferring to the computer, the fast Fourier transform will calculate their dominant frequency. The sample firmness index is calculated from the dominant frequency and weight. The dominant frequencies and firmness indices obtained by this device for apple fruit were correlated more than 92% and 93% with puncture firmness and elasticity module respectively, and were significant at 1% level. Experimental results showed that the vibration signals have better results for estimation of elasticity modulus (more than 96 % accuracy) and acoustic signals to estimate the firmness (accuracy of more than 95 %).

Keywords


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