Original Article : Predicting the Firmness of Apples using a Non-contact Ultrasonic Technique
농학 > 농공학
( Sang Dae Lee ) , ( Jeong Gil Park ) , ( Hyun Mo Jeong ) , ( Ki Bok Kim ) , ( Byoung Kwan Cho )
바이오시스템공학(구 한국농업기계학회지) 2013년, 제38권 제3호, 192~198페이지(총7페이지)
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    Purpose: Methods for non-destructive estimation of product quality have been reported in various industrial fields, but the application of ultrasonic techniques for the agricultural products of potatoes, pears, apples, watermelons, kiwis and tomatoes etc. have been rarely reported since the application of a contact-type ultrasonic transducer in agricultural products is very difficult. Therefore, this study sought to determine the firmness of apples using non-contact ultrasonic techniques. Methods: For this experiment, an ultrasonic experimental tester using a non-contact ultrasonic transducer was created, and a signal processing program was used to analyze the acquired ultrasonic reflected signal. Also, a universal testing machine was used to measure firmness parameters of the apples such as bioyield strength, a firmness factor, after the ultrasonic tests had been performed. Results: Six distance correction factors were calculated to obtain consistent values of ultrasonic properties regardless of the distance between the transducer and the surface of the subject. We developed prediction models of the bioyield strength using the distance correction factors. Conclusions: The optimum prediction model of the bioyield strength of apples using a non-contact ultrasonic technique was a multiple regression model (R2=O.9402).
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