尺寸效应下平行板电容器的纸张计数装置

PAPER-COUNTING DEVICE BASED ON PARALLEL-PLATE CAPACITOR UNDER SIZE EFFECT

目前研发一种新型的、对纸张尺寸和材质无特殊要求的纸张计数装置对造纸业和印刷业有着重要的意义。考虑到平行板的尺寸效应,分别使用理论计算、有限元仿真和实验验证的方法,找出不同尺寸的平行板电容器的电容值随着纸张数量变化的规律。最后用STM32F103C8T6最小系统板作为控制中心,由平行板电容器、FDC2214电容传感器、人机交互系统构成一种纸张测量装置。该装置在用标准A4纸张校准后,在60张内计数的准确率高达100%。该装置还可以用于其他绝缘类纸张或布匹等的数量检测。

At present, developing a new type of paper-counting device without special requirements on paper size or material is of great importance to the paper industry and printing industry. When the parallel plate capacitor is used as the sensor to measure the number of paper, the capacitance of the capacitor will change with the number of paper. Taking into account of this size effect of the parallel plates, the laws of the capacitance of different size capacitors changing with the number of paper are found out by using the methods of theoretical calculation, finite element simulation and experimental verification. Finally, using the STM32 F103 C8 T6 minimum system board as the control center, a paper-counting device is bult by a parallel-plate capacitor, a FDC2214 capacitance sensor and a man-machine interactive system. After calibrating the device with standard A4 paper, the accuracy of paper counting in 60 sheets is up to 100%. The device can also be used to measure the number of other insulating paper or cloth, etc.