平行板电容器测量烟叶含水率的方法

2015-10-21 18:06:31罗丽琼张军情鲁绍坤等
安徽农业科学 2015年31期

罗丽琼 张军情 鲁绍坤等

摘要[目的]为提高烟叶含水率的检测效率,建立平行板电容器测量烟叶含水率的方法。[方法]通过对BXK、B3F、C3F、X2F、CSF、BSF 6个等级烟叶含水率与电容进行检测,研究不同等级烟叶含水率与测量电容值的关系,建立电容与烟叶含水率的对数模型。[结果] 以6种等级烟叶电容为基础建立的含水率对数模型为Y=A×ln(x)+B,其预测结果与采用烘箱法测定结果的拟合效果理想。[结论] 用平行板电容器测量烟叶含水率的方法是可行的。

关键词含水率;电容器;拟合方程;烘箱法

中图分类号S-3文献标识码A文章编号0517-6611(2015)31-025-03

Method of Parallel Plate Capacitor Measuring Moisture Content of Tobacco

LUO Liqiong,ZHANG Junqing, LU Shaokun et al (Yunnan Agricultural University, Kunming, Yunnan 650201)

Abstract[Objective] In order to improve the detection efficiency of the tobacco moisture, the method of parallel plate capacitor measuring moisture content of tobacco leaves was established. [Method]By detecting tobacco moisture and capacitance of BXK, B3F, C3F, X2F, CSF and BSF, the relationship between water content and capacitance measurements of the different grades of tobacco leaves was studied, and a logarithmic model of the tobacco moisture content and capacitance was established. [Result] On the basis of the capacitance of the six grade of tobacco leaves, the logarithm model of the moisture content was Y = A ln (x) + B. The fitting effect of prediction results and that of the oven method was ideal. [Conclusion]The method of parallel plate capacitor measuring tobacco moisture content is feasible.

Key wordsMoisture content; Capacitor; Fitting equation; Oven method

煙叶属于胶质毛细管多孔体物质[1-3],对空气湿度十分敏感,具有灵敏的吸湿性和放湿性[4]。烟叶含水率会影响烟叶的物理特性(质量、抗破碎性、填充性等),也会影响烟叶的生物化学变化,影响烟叶的色香味[5]。因此,烟叶含水率与加工、贮存、运输等各个环节关系密切[6]。烟叶含水率过低,叶片易破碎,不易成包调运,在醇化加工和打叶复烤过程中会增加损耗,降低生产利润;烟叶含水率过高,不利于储存保管,烟叶颜色易变暗,甚至霉变而降低或失去使用价值。适宜的含水率能够保持烟叶的完整性,确保烟叶的使用价值,并且在平衡含水率的条件下达到自然醇化和提高烟叶品质的目的。目前,烟草、烟草制品含水率检测主要以烘箱法[7-9]为依据,但是该方法的检测过程复杂,耗时费力。通过测量烟叶的电容后转换成含水率,可减少水分检测的时间。平行板电容器是利用物体的介电特性原理来检测的。……

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