基于ADUC848的压差法气体透过率测试仪研制.pdf

2015年11月1现代电子技术第38卷第21期Modern Electronics Tcchniqucol.38No.21doi:10.16652/j.issn.1004-373x.2015.21.035基于ADUC848的压差法气体透过率测试仪研制林春景,袁俐萍(1.广东自云学院电气与信息工程学院,广东广州510450;2.#南理工大学广州学院、广东广州510800)摘要:为了选择合适的包装材料,预测产品的货架寿命,生产包装厂家和研究单位需要一种能自动、准确、全面地测量O2,N2,CO2及仿真空气渗透率的测试仪器。采用压差法测量气体的透过率,并通过ADUC848硬件和软件实现对气体滲透率的自动检测,做到测试温度、压力、湿度等环境可进行自动调节,并能与上位机进行数据通信,各种測试参数可以很方便存贮在上位机内,以便进行分析。实測表明,该设备对温度、压力、湿度、渗透率等参数測量精度高,达到了食品包装行业的设计要求关键词:压差法;气体透过率;ADUC848;软件设计中图分类号:TN710-34:TP393文献标识码:A文章编号:1004-373X(2015)21-0133-03Development of Aduc848-based gas permeability testerapplied with differential pressure methodLIN Chunjing, YUAN Liping( 1. School of Flectric and Inornalion Ingineering, Guangdong Raiyun University, uanghou510450, himaGuangzhou College of South China University of Technology, Guangzhou 510800, ChinAbstract: To select the suitable packaging material, and forecast the shelf-life of the products, a test instrument which canmeasure (2, N2, CO2 automatically, accurately and roundly, and simulate the gas permeability needing by the production andpackaging manufacturers and researeh institute. The differential pressure method is used lo measure the gas permeability, inwhich the automatic testing system is realized by A1UC848 harware and software. The environments of test temperature, pressure and humidity can be adjusted automatically, and conduct with data communication with the upper computer. Various testparameters can be stored in the upper computer conveniently, which is easy to analyze. The actual measurement shows that thetester has high measurement accuracy for the parameters of temperature, pressure, humidity and permeability, and can achievethe design requirements of the food packaging industry.Keywords: differential pressure method; gas permeability; A1)UC848; software design0引言调)的阻隔性检测仪器。压差法是檢测包装材料阻隔性比较有效的手段随着生活水平的提高.人们口益认识到包装对食其空法是压差法中最具代表性的?种测试方法,也是气品、医药、保健品等产品的重要性。无论在国际还是国体渗透定义的方法叫,其测试原理(如图1所示)是利用内市场,对产品货架寿命期望值的提高,使得对包装材试样将渗透腔隔成两个独立的空间,先将试样两侧都抽料阻隔性要求也越来越高。为了选择合适的包装材成真空,然后向其上側充入?个大气力(绝对压力料,预测产品的货架寿命,整体包装对氧气、空气、湿气0.1MPa)的测试气体(如O2),而下側则保持真空状态。等渗透性进行测试是生产厂家值得乖视的问题。同肘样在试样两側就形成了0.MPa的测试气体压差,测试气体渗透通过薄膜进人低压侧,并引起低压側压力的生产包装厂家和研究单位需要种能白动、确、全面变化。通过使用高精度测压计测量低压侧的压力变化地检测包装材料对O2,N2,CO2及仿真空气(温度、湿度可量,就可以利用公式M=PI/R计算气体透过量,其中P是气体压力,V是容积,M是气体质量,R.是某一种收稿日期:2015-03-27基金项目:东自云学院与州西塘机电科技有限公司校气体的气体常数,T为气体温度。压差法具有对测试气企合作项目体没有选择性,测试成本低,实验成功率高等著的检檢