西瓜成熟與否和聲音關係

科展類別
臺灣國際科展
屆次
2007年
科別
物理科
學校名稱
國立彰化高級中學
指導老師
賴文哲
作者
吳元劭
關鍵字
西瓜,聲音

摘要或動機

一般人從小就知道如果要判斷西瓜有無成熟,只要用手輕拍瓜皮,利用聲音的特性就可以知道西瓜是否成熟,此技術看起來容易,卻需有多年經驗之西瓜商始可為之。本研究利用拍擊西瓜所造成之聲音進行非破壞性音波檢測,來探討西瓜之成熟度。換言之,本研究希望在依照西瓜商拍擊的習慣下,從客觀的科學角度,探討存在於西瓜商手上「聽音辨瓜」的奧秘。由研究結果得知,西瓜的拍聲在頻譜中可分為三個頻區,即西瓜殼所造成的高頻區,水及含水量高的果肉所形成的中頻區,及由空洞及含水量低的果肉所造成的低頻區,而西瓜商就是藉由這三種音頻所表現出的綜合效果進行判斷。The method, tapping the watermelon rind and listening to the sound, has been often used to judge whether the watermelon is mature or not. Although it is not difficult to tap the rind of a watermelon, it is not so easy to have a correct judgment of the maturity just from the sound you heard, unless you are an experienced watermelon farmer. In order to investigate the secret that the farmers have, this research detects and analyzes the sound of tapping watermelons in an objectively scientific way. According to the experimental results, the sound could be approximately partitioned into three regions in the frequency spectrum, denoted as high-frequency, mid-frequency, and low-frequency regions. The high-frequency region and mid-frequency region are resulted from the hard solid rind and the juicy flesh of a watermelon, respectively. As for the low-frequency region, it comes from the vacant holes or flesh with little amount of water. Based on the experiment, it can be concluded that the maturity of a watermelon can be correctly judged from the combination of these three frequency regions, just like the farmer’s method.


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