生物质传感器的有限元分析与测试  

Finite element analysis and test of biomass sensor

作　　者：李海洲[1] 于劲松[1] 

机构地区：[1]上海理工大学医疗器械与食品学院,上海200093

出　　处：《中国农业大学学报》2011年第3期150-155,共6页Journal of China Agricultural University

基　　金：国家自然科学基金资助项目(31000780);上海高校优秀青年教师专项基金(slg08030);上海市教委科研创新项目(09YZ222)

摘　　要：针对生物质传感器的电容式检测单元设计前期结构如何选型的问题,利用有限元方法对基本交指型、极化交指型、半交指型和固态电极传感器设计4种检测单元结构进行模拟和对比。结果显示:虽然极化交指型传感器设计产生的电容响应值只有基本交指型设计的7%,但电容变化率(0.99%)却是基本交指型设计的100倍。半交指型和固态电极型是对极化交指型的优化设计,当秸秆-传感器间距为1.5 cm时,半交指型和固态型的电容变化率分别为1.32%和1.26%,两者差异不大;相对于半交指型固态电极型的结构更为简单,因而选择固态电极型设计制作传感器的物理原型。实际田间测试结果表明,该物理原型可以有效地鉴定秸秆的存在。Aiming at the problem of detection element design of biomass sensor,a number of capacitive sensor patterns were simulated using the Finite Element method,and then the patterns were fabricated and tested in the laboratory.Finally,a non-intrusive,capacitive,single-sided biomass proximity sensor was developed.The result showed that while the polarized inter-digital pattern produced only 7% of the base capacitance of the basic interdigital pattern,the percentage change in capacitance（0.99%） was more than 100 times that of the basic interdigital pattern.Semi-interdigital pattern and solid electrode pattern is the optimization of polarized inter-digital pattern,and the capacitance change was 1.32% and 1.26% for the semi-interdigital and the solid patterns respectively while the sensor-stalk distance is 1.5 cm.It is likely that the very small difference in the modeled performance of these two patterns.Based on these results,the simple solid electrode pattern was selected for further investigation.

关 键 词：生物质 电容式 玉米秸秆 精准农业 传感器 

分 类 号：S134[农业科学—农业基础科学]