Method for accurately nondestructively identifying ripeness of watermelon

Abstract

The invention discloses a method for nondestructively identifying ripeness of a watermelon. The odour volatilized by a known ripe watermelon and an unripe watermelon is sampled by an electronic nose, the sampling data of the known ripe watermelon and the unripe watermelon are analyzed by utilizing a PCA (Principle Component Analysis) module of the electronic nose, and an unripe watermelon standard analyzing template and a ripe watermelon standard analyzing template are established according to an analyzing result. The odour volatilized by an unknown watermelon is sampled by the electronic nose; the sampling data of the unknown watermelon is analyzed respectively by utilizing an Euclidean distance analyzing module, a Mahalanobis distance analyzing module, a relevance analyzing module and a distinguishing and judgment analyzing module of the electronic nose; the analyzing result is compared with the established templates to identify the unknown watermelon; and a final identifying result is obtained by combining the identifying results of the four analyzing modules, i.e. the consistent identification of at least three of the four analyzing modules is considered to be the identifying result on the unknown watermelon, therefore, the method for identifying the watermelon realizes nondestructive identification and high identifying accuracy.

Description

technical field [0001] The invention relates to a method for identifying the maturity of watermelons, in particular to a non-destructive and accurate method for identifying the maturity of watermelons. Background technique [0002] Because watermelons are not as easy to determine as those fruits that emit an aromatic smell or change in appearance color once ripe, many scholars at home and abroad have conducted a lot of research on this. Concerns. Clark found that the decay time of sound waves passing through the watermelon is closely related to the firmness of the watermelon, and the decay time increases with the maturity of the watermelon. Yamamoto et al. used acoustic excitation to measure the natural frequencies of several fruits (including watermelon), and proved that the acoustic properties of fruits are significantly related to Young's modulus, ultimate strength and hardness. In China, He Dongjian and others have proved the correlation between the decay time of the s...

AI Technical Summary

Problems solved by technology

Xia Heng et al. assumed and verified the vibration model of watermelon, and proved that the polygonal mode shape can be used as the characteristic mode to distinguish ripe and immature melons. However, there are certain errors in the above theoretical and actual test results, which cannot be accurately identified and need to be improved.

There is currently no non-destructive, accurate method for judging the ripeness of watermelons

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