2-D Micro-Matrix Code Reader for Computer-Integrated Flexible Manufacturing

本研究是为了验证二维应力光学扫描仪的精度和微弧度分辨率。在药品生产中，工件和包装对于传统的条形码来说都太小了。特别重要的是使用自动识别来验证药品的正确标签。贴错标签一直是一个持续存在的安全问题，贴标生产线受到严格监管和检查。半导体晶圆、半导体芯片、印刷电路板的生产企业由于需要编码的大量数据空间不足，正在转向使用二维码。读取二维码最可靠、最准确、最快速的技术将是固态扫描方法；在各种可用的技术中，应力光学是利用光弹性材料施加的应力，最适合于小光束和通过相对较小的扫描角进行快速、精确的扫描。应力在某些玻璃中产生的折射率变化比电场在光电材料中产生的折射率变化更大。响应速率可能达到兆赫兹。此外，对光学玻璃施加应力不会增加其已经很低的损耗，并且响应是非色散的。最后，光学玻璃通常比其他方法中使用的材料更坚固，更环保，成本更低。基本应力-光学夹层的可制造性是直接的，这将使它比电光等效设备便宜得多。后两个优点被认为在矩阵码阅读器市场中非常重要。

9360173 Seaver This research is to demonstrate the accuracy and micro-radian resolution of a two-dimensional stress-optic scanner. In the production of Pharmaceuticals, both the workpiece and the packaging are too small for conventional bar codes. Of particular importance is the use of Automatic Identification to verify the correct labeling of Pharmaceuticals. Mislabeling has been a persistent safety problem and labeling production lines are closely regulated and inspected. Producers of semiconductor wafers, semiconductor chips, and printed circuit boards are shifting to two-dimensional codes due to lack of space for the amount of data that needs to be encoded. The most reliable, accurate and fastest technique for reading two-dimensional codes would be a solid-state scanning approach; of the various techniques available stress-optics, using an imposed stress in photoelastic materials, is the best for small beams and fast, precise scanning through relatively small sweep angles. Stress can produce a such greater index change in some glasses than can an electric field in electro-optical materials. And response rates up to megahertz are possible. Also, the imposition of a stress to optical glass does not increase its already low-loss, and the response is non-dispersive. Finally, optical glasses are generally more rugged and environmentally stable and cost less than do the materials used in other approaches. The manufacturability of the basic stress-optics sandwich is straight forward and this would make it significantly cheaper than electro- optical equivalent devices. These last two advantages are considered to be very important in the matrix code reader market.