Optical integration and signal processing algorithms for high resolution inspection of impression rollers

在工业印刷中，对精确控制和性能优化的需求越来越大 世界范围内的工业。在打印过程中，工业打印机需要使用材料和耗材 基于产生严重污染的着色油墨。该项目旨在解决这些问题。主 目的是开发一种便携式仪器，用于完全控制墨辊的清洗过程 并优化溶剂的使用，以达到清洗给定陶瓷滚筒所需的精确程度。在这个项目中 我们将优化一种基于干涉测量的专用仪器，可以测量表面高度 轴向分辨率高(1微米)的不均匀性。该探头基于单模光纤，其上的GRIN 附加镜头是为了在很长的视野深度内聚焦。使用宽带激光和旋转棱镜 改变干涉仪参考臂长(延迟线)，系统能够成像深度达10 mm以上 具有微米级的分辨率。具体目标是：1)开发一种具有以下功能的光电采集卡 USB2通信，可用于采集高达10 Mhz的干涉测量信号并实时发送数据 该是便携式电脑的时候了。2)优化光学干涉仪(包括延迟线)的设计 包装。3)开发信号采集链，以提高信噪比并产生健壮性 深度的量度。这项工作的直接结果将是开发一种改进的仪器，即 携带方便，随时可以在现场进行测试。

There is an increasing demand for precise control and performance optimization in the industrial printing industry worldwide. During the process of printing, industrial printers require using materials and consumables based on pigmented inks that generate significant pollution.This project aims to address these issues. The main objective is to develop a portable instrument that can be used to fully control the cleaning process of ink rollers and to optimize the use of solvents to what is precisely needed to clean a given ceramic roller. In this project we will optimize a dedicated instrument based on interferometry that can measure surfaces with height inhomogeneity with high axial resolution (1 µm). The probe is based on a monomode fiber on which a GRIN lens is attached for focussing over a long depth of view. Using a wide bandwith laser and a rotating prism to vary the interferometer reference arm length (delay line), the system is able to image upwards 10mm depth with micron resolution. The specific objectives are: 1) To develop an optical-to-electrical acquisition card with USB2 communication that can be used to acquire interferometry signals at up to 10Mhz and send data in real time to a portable computer. 2) To optimize the optical interferometer (including the delay line) design and packaging. 3) To develop a signal acquisition chain to increase signal to noise ratio and generate robust measures of depth. A direct outcome of this work will be the development of an improved instrument that is portable and ready for tests in the field.