大豆水分测定仪的设计与试验  

Design and experiment of soybean moisture content meter

作　　者：熊显名[1] 唐绮雯 张文涛[1] 王心芒 聂君扬 

机构地区：[1]桂林电子科技大学电子工程与自动化学院广西高校光电信息处理重点实验室,广西桂林541004

出　　处：《现代电子技术》2016年第20期117-120,共4页Modern Electronics Technique

基　　金：广西自然科学基金项目(2014GXNSFGA118003;2013GXNSFDA019002);广西教育厅项目(ZD2014057);桂林市科学研究与技术开发课题(20130122-2;20140127-1)

摘　　要：为了实现大豆水分的便捷、快速和无损测量,基于近红外法设计一种以STM32F103为控制器,激光二极管、探测器和积分球为光路系统,信号处理电路和光电转换器为电路系统的大豆水分测定仪。以黄大豆为研究对象,通过试验分析黄大豆含水率对吸收峰波长和参考波长光功率吸收的规律,建立黄大豆含水率与不同波长光吸收率的多元多次数学模型,并对模型的可靠性进行了检验。实验结果表明,所设计测定仪在黄大豆含水率在10.0%~20.0%范围内的绝对测量误差为-0.9%~2.2%,响应时间小于1.2 s。In order to achieve convenient, fast and non-destructive detection of soybean moisture content, an soybean moisture content meter was designed, which takes STM32F103 as its controller, laser diode, detector and integrating sphere as its beam path system, and signal processing circuit and photoelectric converter as its circuit system. A multi-element mathematical model of yellow soybean moisture content and different wavelength light absorptivity was established by analyzing the luminous power absorption law of peak wavelength and the reference wavelength for yellow soybean moisture content. The reliability of the model was tested. The results show that the designed meter＇ s the absolute detection error in the range of 10.0% - 20.0% of yellow soybean moisture content is -0.9% - 2.2% and its response time is less than 1.2 s.

关 键 词：大豆 无损测量 含水量测定仪 光路设计 

分 类 号：TN98-34[电子电信—信息与通信工程] TM93[电气工程—电力电子与电力传动]