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This paper introduces an acoustic probing technique to estimate the storagetime and firmness of fruits; we emit an acoustic signal to fruit from a smallspeaker and capture the reflected signal with a tiny microphone. We collectreflected signals for fruits with various storage times and firmnessconditions, using them to train regressors for estimation. To evaluate thefeasibility of our acoustic probing, we performed experiments; we prepared 162tomatoes and 153 mandarin oranges, collected their reflected signals using ourdeveloped device and measured their firmness with a fruit firmness tester, fora period of 35 days for tomatoes and 60 days for mandarin oranges. We performedcross validation by using this data set. The average estimation errors ofstorage time and firmness for tomatoes were 0.89 days and 9.47 g/mm2. Those formandarin oranges were 1.67 days and 15.67 g/mm2. The estimation of storage timewas sufficiently accurate for casual users to select fruits in their favoritecondition at home. In the experiments, we tested four different acoustic probesand found that sweep signals provide highly accurate estimation results.

Acoustic Probing for Estimating the Storage Time and Firmness of Tomatoes and Mandarin Oranges