【作者】 杨程；

【导师】 王玉田；

【作者基本信息】 燕山大学 ， 精密仪器及机械， 2009， 硕士

【摘要】 在我国,玻璃生产能力早已达到发达国家的水平,但玻璃厚度的检测仍多采用人工测量的方法,不仅检测效率不高,而且检测结果易受人为因素影响,因此在线玻璃测厚技术显得特别重要。将CCD应用于厚度测量可实现高精度、在线动态检测和非接触测量等要求,尤其对微小厚度变化量测量具有很强的优势。基于光的折射反射原理,根据浮法玻璃生产工艺,玻璃在传输过程中易发生抖动这一不足,对该原理进行改进,提出双光路补偿测量方法。选用半导体激光器为光源,对线阵CCD外围电路进行了理论设计和实验研究,最后设计了以CCD为光电转换元件,由计算机进行数据处理的非接触式厚度测量系统。经理论分析,该系统的测厚范围在1～20 mm,精度可达0.01 mm。测量系统采用CPLD(复杂可编程逻辑器件)设计调试CCD时序驱动电路,提高了电路的可靠性和灵活性。CPLD设计采用MAX+PLUS II开发环境完成器件的全部工作。视频信号处理电路完成了原始信号的初级捕捉、视频的放大,CDS(相关双取样)滤波和浮动阈值二值化。二值化后的数据通过区域标定、厚度判断等处理后,将最终数据送入单片机进行存储和显示。对CCD驱动时序电路进行仿真实验,结果表明该电路能很好地驱动CCD,充分发挥CCD光电转换特性,输出稳定可靠的电信号。实验模拟了玻璃生产现场环境,对不同厚度的玻璃进行多次测量,得到检测数据,并对数据进行了分析处理。更多还原

【Abstract】 In our country, glass production capacity has already reached the level of developed countries, but the thickness of glass is still used artificial measurement method. Detection efficiency is not high enough, and test results are vulnerable to man-made factors. Therefore research on the thickness of glass-detection technology is particularly important. The measurement system with CCD has an advantage on geometrical measurement such as thickness for achieving high accuracy, on-line dynamic detection, non-contact measurement, especially adapts to measure little thickness alternation.Based on refraction and reflection principle,according to the production technology of float glass, glass will quiver in the transmission. As to this deficiency, the refraction and reflection principle is improved, and the method of double beam path compensation is advanced. The semiconductor laser is chosen as light source, and peripheral circuit of linear CCD is designed in theory and studied in experiment. Finally non-contact thickness measurement instrument is constructed, using CCD as photoelectric transformation element and computer as the controller. After theory analysis, measurement range of the system is between 1 mm to 20 mm, and the precision is 0.01 mm.The time order driving circuit of CCD is designed and debugged with CPLD (Complicated Progra mmable Logic Device), which enhance reliability and agility of circuit. The CPLD designing under MAX+PLUS II can complete all work. The video signal processing circuit realizes the primary catching, signal amplifying, CDS filtering and variable threshold binarization. The binary data is regional calibrated and thickness judged, and then the final data is input to computer.The experiment of CCD time order driving circuit shows the circuit can drive CCD perfectly; take advantage of the characteristic of CCD photoelectric transition and output steady and reliable electric signal. Experiments simulate condition of producing glass, carry on several measurements for glass with different thickness, get and analyze measured data.更多还原