【作者】 李恒；

【导师】 段发阶；

【作者基本信息】 天津大学 ， 测试计量技术及仪器， 2007， 硕士

【摘要】 厚度均匀性是评价塑料薄膜产品质量的重要指标,随着包装、医疗等行业对薄膜品质要求的提高,传统离线抽检的方式不能满足检测要求,迫切需要研制一种能够实现塑料薄膜厚度在线检测的系统。课题基于电容传感器融合涡流传感器开发了一种塑料薄膜厚度在线动态扫描检测技术。论文针对动态扫描检测中存在的各种误差,建立了单涡流补偿和双涡流补偿的模型,探索了系统的温度漂移特性,为进一步提高系统的测厚精度,走向工业实用奠定了基础。本文的创新点在于详细分析了影响动态扫描检测精度的主要因素;提出了涡流传感器同步扫描的补偿方案;研究了测厚系统的温度、湿度漂移特性,并进行了温度补偿。论文主要包括以下几个方面的工作:1.详细分析了动态扫描检测中引入误差的各种因素如外部振动、导轨直线性误差,下极板表面不平度、扫描方向定位精度、温度、湿度漂移等对系统测量精度的影响;2.设计了预扫描和同步扫描的补偿方案,建立了单涡流补偿和双涡流补偿的模型,具体分析了单涡流和双涡流补偿的理论依据;3.设计了采用SHT15传感器的温湿度测量电路,完成了单片机的数据采集和串口通信程序,研究了系统的温度特性,并进行了温度补偿方面的研究和实验;4.构建了一套动态扫描测厚装置,应用标准厚度的薄膜测定了系统灵敏度,在此基础上对样品薄膜进行了动态测厚实验,验证了该系统工作的可靠性和稳定性。更多还原

【Abstract】 The thickness equality is an important parameter for evaluating the quality of the plastic film. Traditional off-line way of measurement could not meet the actual need. It is in dire need of developing a kind of on-line measuring the thickness of plastic film system. This paper individually designed a set of dynamical scanning system for measuring the thickness of plastic film based on capacitive sensor accompanied by the eddy sensor. To eliminate the errors in dynamical scanning measurement, single-eddy and double-eddy sensor compensation models were established in this paper. The temperature drift characteristic of system was explored.Innovation points are shown as follows. A double-eddy sensor synchronous scanning compensation solution was proposed. The temperature characteristic of thickness measurement system was researched in detail, and temperature drift compensation was discussed. The way of increasing the sensitivity and linearity was explored.The main work included in the dissertation is shown as follows.1. Analyzing the errors in dynamical scanning measurement in detail such as external vibration, linearity error of rail, temperature and humidity drift.2. Designing the before-compensation and synchronous compensation, establishing the single-eddy sensor and double-eddy sensor compensation models, and analyzing these models in theory.3. Designing the temperature and humidity measuring circuit based on SHT15 sensor, accomplishing the program for data acquiring and serial communication, and researching on temperature drift and compensation;4. Constructing a set of dynamical scanning equipment for measuring thickness, measuring the sensitivity of system using standard film, experimenting on some samples, and validating the reliability and stability of system.更多还原