Non-destructive grading of mangosteen by using microwave moisture sensing

Mangosteen, "the queen of fruits", with flesh translucent disorder is not wanted. The main cause of the disorder is that there exists too much water during the growing process of the fruits. Since microwave techniques had been shown to effectively measure the moisture, we propose to use the microwave technique to classify mangosteens with translucent flesh from good ones. The proposed technique is based on the finding of a threshold in term of magnitude of the reflected microwave signal sending through a mangosteen. The monopole probe is chosen. Experiments with 67 samples of mangosteen were performed. The results showed an overall accuracy of 79% with negative faults (grading good ones as bad ones) of 13.4% and positive faults (grading bad ones as good ones) of 7.4%.