Non-contact measurement of plastic film thickness

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, the project designs the on-line measurement system based on infrared technology. The system uses DSP as the control core. Firstly, the program of film thickness measurement was presented. Then modulation signal generation circuit was designed with NE555, and realized the stability outputs of the test signal using a steady flow circuit. After that, the signal acquisition and processing system for film thickness was designed. It consists of the A/D converting and filtering technology. Finally, the software process of the system was presented. With the experimental verification, the system has high efficiency, strong resistance to interference in the measurement, and it has a high practical value. The functions and indexes achieved the design requirements.