农业工程学报2012，Vol.28Issue(3)：283-287,5.DOI:10.3969/j.issn.1002-6819.2012.03.049
基于声学特性的西瓜糖度检测系统
Acoustic detecting system for sugar content of watermelon
摘要
Abstract
An acoustic system was developed to detect the sugar content of watermelon nondestructively, which consists of a steel ball wrapped with rubber, 6 piezoelectric accelerate sensors, an electricity amplifier, an optical trigger, a data acquisition card and a computer. Acoustic transmissivity can be calculated from the amplitude spectrum. And 6 characteristic frequencies, 752, 869, 1001, 4556, 322, 3950 Hz, were chosen with the function of SMLR (Stepwise Multiple Linear Regression) using TQ software. The acoustic transmissivity at frequencies were used to setup a multi regression models for the detection of watermelon sugar content. 47 watermelons were tested, and the results showed that the best detection model can be obtained by tapping the equator part and receiving the signals from the opposite side with watermelon being put in its growing position, the R value was 0.80753, RMSEC was 0.646, RMSEP was 0.655. The research proved the possibility of the system in detection of sugar content of watermelon and can provide a reference for further research in this area.关键词
声学/测试/模型/西瓜/糖度/声透过率/逐步多元线性回归Key words
acoustics/testing, models/watermelon/sugar content/acoustic transmissivity/stepwise multiple linear regression分类
轻工纺织引用本文复制引用
危艳君,饶秀勤,漆兵..基于声学特性的西瓜糖度检测系统[J].农业工程学报,2012,28(3):283-287,5.基金项目
国家高技术研究发展计划(863计划)项目"智能化工况模拟与检测系统研究开发",2010AA101401-2 （863计划）
