장파장 열영상을 이용한 계란 기실 비파괴 측정 = Non-Destructive Measurement of Egg Air Cell using Longwave Infrared Thermal Imaging

다국어 초록 (Multilingual Abstract)

The size of an air cell in an egg is an important indicator of its freshness and is often used as a grading index. Currently, the Haugh Unit (HU) test is the most common method for evaluating egg freshness; however, it is destructive and time-consuming, and not all eggs can be tested. To overcome these limitations in evaluating egg quality, non-destructive measurement methods have been explored. In this study, a longwave infrared thermal imaging method was used to predict HU by measuring air cell size. After performing image enhancement by forcing airflow through fans, the thermal image of the egg air cell was used to calculate the size of the air volume of the cell. The results indicated that the size of the air cell increased with storage time at all tested temperatures (5, 15, and 25℃). Further, the correlation between the calculated size and actual volume of the air cell was evaluated using an R² value of 0.946 and SEP of 0.028%. The result indicated that the developed non-destructive egg air cell measurement method has the potential to be a rapid and accurate prediction tool for egg freshness, suggesting that this method is a suitable alternative to the destructive HU measurement method.

국문 초록 (Abstract)

현재 국내에서 가장 일반적인 계란의 신선도 평가 방법은 호우유닛(Haugh Unit, HU) 검사이지만, 파괴적이고 측정에 시간이 많이 소요되며 전수 검사를 할 수 없다는 단점이 있다. 비파괴적인 신선도 측정방법으로 계란 둔단부 내에 위치하는 기실의 크기를 측정하여 신선도를 판단할 수 있는데 아직까지 비파괴 측정기술이 개발되어 있지 않다. 계란 기실의 비파괴적 측정방법을 개발하기 위해, 본 연구에서는 장파장 대역(8~14μm)에서 작동하는 열화상 카메라와 강제 공기 유동 방식을 융합하여 계란의 기실 크기를 비파괴적으로 측정하는 방법을 개발하였다. 기실의 크기는 계란의 저장 온도(5℃, 15℃, 25℃)에 관계없이 저장기간이 길어질수록 크기가 증가하는 경향을 보인다. 구축된 측정 장치를 이용하여 계란 기실의 크기를 비파괴적으로 예측하였을 때, 실제 기실 크기와의 상관관계가 R²=0.946, SEP=0.028%로 나타났다. 본 연구결과는 열화상 및 강제 공기 유동 방식을 활용했을 때, 신선도 지표 중 하나인 계란 기실 크기를 신속하고 정확하게 비파괴 측정할 수 있음을 보여주었다.

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