面向绝对光栅尺的编解码优化设计与研究-机械工程专业论文.docxVIP

优秀毕业论文 精品参考文献资料 广东工业大学硕士学位论文Ab 广东工业大学硕士学位论文 Ab stract High precise position is usually achieved by the high accuracy linear encoder in the micro nano machining process，The linear encoder is the core components and can realize the real-time position correction in the closed—loop control system，which has been the hotspot of research in recent years．Linear encoder can be divided into incremental linear encoder and absolute linear encoder，using incremental linear encoder have problems in the process of machinery,such booting back to zero．this situation usually lead to the loss of position information when power down，and often make the cost of processing very expensive and efficiency low,but there are many advantages for absolute linear encoder，such as no accumulated error,high precision，stable and reliable．Meantime，linear encoder can get the absolute position when power up．therefore， it has always been the focuses of colleges and universities or research institutions．This paper is based on the work of innovation team of Guangdong University of technology which have independent intellectual property rights for the first generation of absolute linear encoder，and proposed the optimized design scheme of absolute linear encoder based on NIOS．The mainly work of this paper are as follows： The paper firstly introduce the composed modules of the common absolute linear encoder and the basic principle of the measurement system of linear encoding technology． After analysed the shortage of the first generation absolute linear encoder which used the image processing technology to achieve measurement．The paper proposed the optimized coding and decoding design scheme of absolute linear encoder based on NIOS． On the basis of high speed decoding and miniaturization of absolute linear encoder requirements，we completed the hardware selection of the system．According to PCB design principles，we finished the design of circuit based on FPGA processor,and achieved high—speed acquisition of abs