Design of Portable Fruit Impedance Spectrum Measuring System

This paper designs a portable fruit impedance spectrum measurement system, which is specially designed for fruit maturity evaluation in fruit picking, transportation and customer selection. Its design uses conductive materials for contact-type non-destructive measurement, uses AD5933 to collect the impedance distribution of the measured fruit at each frequency band from 10KHZ to 100KHZ, draws the impedance spectrum of the fruit, and displays the measurement results in an intuitive way on the Android APP on the mobile phone. In the process of the experiment, the impedance spectrum of the passive components is collected. The test results are compared with the performance of the desktop impedance analyzer under the same measurement conditions. The relative error of the measured values are less than 3.8%. Finally, we give an example of the application of this design in the impedance spectrum measurement of green mango fruit.