基于数字滤波技术的薄膜厚度在线检测

Detection of Film Thickness Based on Digital Filtering Technique

随着国民经济的发展以及产业结构的调整,中国各行各业对塑料薄膜的市场需求不断上升。为了实现薄膜厚度的在线检测,设计了一种以TMS320F2812为主控芯片的基于数字滤波技术的薄膜厚度在线检测系统。首先,介绍了薄膜厚度的检测方案,然后,应用NE555设计了调制信号产生电路,通过稳流电路实现了测试信号的稳定输出,最后设计了薄膜厚度信号的采集与处理系统,主要包括待测信号的A/D转换和数字滤波。经实验验证,该系统检测薄膜厚度时具有效率高,抗干扰性强等特点,具有较高的使用价值。

The market demand for plastic film has increased as the development of the national economy and the adjustment of industrial structure.In order to measure the film thickness during the process of film production,this paper designs the on-line detection system based on infrared technology.The system uses TMS320F2812 as the control core.Firstly,the program of film thickness detection is described.Then modulation signal generation circuit is designed with NE555,and the stability output of the test signal by a steady flow circuit is realized.Finally,the signal acquisition and processing system for film thickness is designed.It consists of the A/D converting and filtering technology.The test results show that the system has high efficiency,strong resistance to interference during film thickness measurement,and high practical value.