基于声学特性的西瓜品质无损检测试验研究Nondestructive testing of watermelon quality based on acoustic characteristics摘要我国对农产品的质量要求越来越严格，我们将采取许多方法来提高西瓜市场的竞争力。目的都是为了提高西瓜的品质质量，而想要提高质量就要提升并完善对西瓜的栽培技术。对于西瓜的采收和分级评定都离不开西瓜内部的品质的无损检测技术支持。本次的研究就是为了用无损检测方法中的超声来对新瓜内部进行检测。此次采用声穿透法，利用非金属检测仪，采取双探头进行检测。根据内置超声波感应平台上通过西瓜果肉的超声波信号，声音的传输速率从脉冲传输点传输到接收点。声速，波形及增益等。研究西瓜内部不同点之间的声速、波形、检测不同点之间的声程的变化以及随时间果肉内部发生变化是否有关系，以此来对西瓜的进行分级，判定西瓜果肉质量的检测方法。主要是通过西瓜在不同方向上声程的衰减变化来对西瓜品质进行鉴定。关键字：无损检测； 声穿透法； 质量；衰减；北京理工大学珠海学院 2016 届本科生毕业论文AbstractOur country is more and more strict to the quality of agricultural products, we will take a lot of methods to improve the competitiveness of the watermelon market, the purpose is to improve the quality of watermelon quality, and to improve the quality of watermelon to improve the cultivation technology, The harvest and grading of watermelon can not be separated from the technical support of NDT for the internal quality of watermelon. The purpose of this study is to detect the inside of the new melon with the ultrasonic method of nondestructive testing. This time, the method of sound penetration is adopted, and the non-metal detector is adopted to detect with double probes. According to the ultrasonic signal of watermelon pulp on the built-in ultrasonic induction platform, the transmission rate of sound is transmitted from the pulse transmission point to the receiving point, including sound path, sound speed, waveform and gain, etc. In order to...
