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이 연구는 수박 비파괴 품질판정기술 개발의 일환으로 수행되었으며, 수박 밀도를 실시간·간편 계측이 가능한 시스템을 개발하고, 측정이 용이한 외관 인자들과 수박 내부품질과의 상관관계를 구명하였다. 특히 밀도 측정에 의해 수박의 당도와 공동 등의 판정가능성을 구명하고자


Density is a physical property which contains information relating to the internal quality of fruits and vegetables, and can be used as an index for nondestructive quality evaluation. Density sorting has been employed by farmers for some agricultural products since ancient times. In this study, an automatic density measuring system based on the platform scale or water displacement method was developed for density sorting of watermelon. It consisted of water tank, load cell, net tray, electric motor, limit switch, control system and its program. The resolution of density was 0.001 g/cm3. In order to calibrate and evaluate the accuracy, the density was measured using a balloon kept in cold water. It showed 1.002 g/cm3 which almost correspond to real density of water. Test results with 6 watermelons and 3 replications showed that the standard deviations of the density were 0.001~0.004 g/cm3. The relationship between density and internal quality of watermelon was investigated using the system. The densities of hollow watermelons were less than 0.950 g/cm3, it was apparent that the density of the watermelon was related to the degree of hollowness. But the soluble solid contents and internal defects could not be estimated from the density.