基于声学特性的西瓜品质无损检测试验研究

AbstractOur country is more and more strict to the quality of agricultural products,we will take alot of methods to improve the competitiveness of the watermelon market,the purpose is toimprove the quality of watermelon quality,and to improve the quality of watermelon toimprove the cultivation technology,The harvest and grading of watermelon can not beseparated from the technical support of NDT for the internal quality of watermelon.Thepurpose of this study is to detect the inside of the new melon with the ultrasonic method ofnondestructive testing.This time,the method of sound penetration is adopted,and thenon-metal detector is adopted to detect with double probes.According to the ultrasonic signalof watermelon pulp on the built-in ultrasonic induction platform,the transmission rate ofsound is transmitted from the pulse transmission point to the receiving point,including soundpath,sound speed,waveform and gain,etc.In order to classify watermelon,the speed andwave form of sound between different points,the change of sound path between differentpoints and whether there is a relationship between the changes of pulp with time were studied.By studying the sound velocity waveform between different points inside the watermelon anddetecting whether there is a relationship between the change of sound path between differentpoints and the change within the flesh over time,we can classify the watermelon.The mainmethod to determine the quality of watermelon flesh is to identify the quality of watermelonby the attenuation of sound path in different directions.Key words:nondestructive testing;Sound penetration;Quality;attenuation;2