基于空气耦合超声的纸张粗化检测系统设计

Design of paper coarsening detection system based on air-coupled ultrasound

纸面发脆、粉化已经成为我国大量纸质文献面临的重大问题之一,目前尚无完全无损的检测方法能够对以上问题做出有效评估。通过不同程度润湿的纸张对超声衰减影响不同的关系,设计了一种基于空气耦合超声的纸张粗化检测系统并进行了纸张定量润湿超声成像实验。该系统使用超声对纸质文献进行扫描,上位机主要采用LabView编写,结合超声波脉冲发生器、接收器、PLC和驱动器以及伺服电机形成闭环控制系统。通过对系统采集图像中粗化区域数据的测量与分析,得出对纸张粗化程度的评估结果。实验证明该系统扫描精度达到0.1 mm,有效地呈现了纸质的粗化程度,为纸张的粗化程度检测提供新的解决方案,并对下一步纸质文献的修复与保存提供了依据。

Paper fragility and chalking have become one of the major problems faced by a large number of paper documents in our country. There is no completely non-destructive testing method that can effectively evaluate the above problems. Designed a paper coarsening detection system based on air-coupled ultrasound based on the relationship between the different degrees of wetted paper on the ultrasonic attenuation and carried out the paper quantitative wetting ultrasonic imaging experiment. The system uses ultrasound to scan paper documents. The host computer mainly uses LabView to compile, combined with ultrasonic pulse generator, receiver, PLC and driver, and servo motor to form a closed-loop control system. Through the measurement and analysis of the data of the coarsening area in the image collected by the system, the evaluation result of the degree of paper coarsening is obtained. Experiments show that the scanning accuracy of the system reaches 0.1 mm, which effectively presents the roughness of paper, provides a new solution for the detection of the roughness of paper, and provides a basis for the restoration and preservation of paper documents in the next step.