药品包衣厚度测量系统晶振频率分析及实验研究.pdfVIP

第42卷第5期 中国测试 Vol.42 No.5 2016年5月 CHINA MEASUREMENT TEST May，2016 doi院10.11857/j.issn.1674-5124.2016.05.006 药品包衣厚度测量系统晶振频率分析及实验研究 何高法袁 周传德袁 任建兵袁 马 霞 （重庆科技学院机械与动力工程学院，重庆 401331） 摘 要院为提高药品包衣效果和包衣质量袁针对包衣厚度在线监测问题袁提出基于石英晶体谐振原理的包衣厚度测量 方法遥 利用石英晶体的压电效应原理分析石英晶体谐振片厚度剪切振动的谐振频率与包衣厚度之间的函数关系袁使 用等效密度法建立有限元模型并分析石英晶体谐振器在不同膜厚情况下的模态和谐振频率袁理论和有限元分析结果 均表明晶片的谐振频率随薄膜厚度的增加而降低袁且呈近似的线性关系袁检测灵敏度约为12kHz/滋m遥 使用石英晶体 微天平系统进行包衣厚度的测量实验袁实测厚度和分析结果具有很好的一致性遥 研究结果表明基于石英晶体谐振的 膜厚测量法可以应用于制药包衣厚度的实时测量遥 关键词院石英晶体谐振器；薄膜厚度；包衣；有限元分析 文献标志码院A 文章编号院1674-5124渊2016冤05-0028-05 Analysis and experimental study of quartz crystal oscillation frequency of drug coating thickness measuring system HE Gaofa，ZHOU Chuande，REN Jianbing，MA Xia （School of Mechanical and Power Engineering，Chongqing University of Science and Technology， Chongqing 401331，China） Abstract: A method to measure coating thicknesses based on the theory of quartz crystal oscillation was put forward in order to improve the effect and quality of tablet coating and online monitoring. To be specific，the piezoelectric effect theory of quartz crystal was employed to analyze the functional relationship between the resonant frequency of quartz crystal resonator thickness shearing vibration and the coating thickness. Meanwhile，an equivalent density method was used to create a finite element model （FEM）to study the modality and resonant frequency of the resonator under different film thicknesses. The theoretical and FEM outcomes have revealed that the resonant frequency declines with the increase of the film thickness and presents an approximate linea