LAMOST高精度光纖定位單元關鍵技術研究

基于LAMO ST 并行可控式光纖定位系統, 介紹了雙回轉光纖定位單元實現高精度定位的關鍵技術。定位單元采用了基于計算機數據端口的開環控制系統, 設置機械零位輔以電子開關構成單元回轉的基準零位以減小多次重定位的累積誤差,采用彈簧消隙機構消除齒側間隙提高系統定位的穩定性。單元采用面陣CCD 傳感器檢測單元定位精度, 通過檢測光纖端部出射光斑的特征點以表征定位單元上光纖端部位置。實驗表明本定位單元能夠實現光纖的快速、高精度定位, 定位精度達到40Lm。
關鍵詞　光纖定位　控制　面陣CCD
Abstract　Based on parallel cont ro llable op t ical fiber po sit ioning fo r LAMOST, the key technique of h igh p reci2 sion po sit ioning unit based on double revo lving device unit is p resented. The data po rt of parallel po rt const itutes the intelligent cont ro ller of stepper mo to r. The system set smechanical zero based on elect ron sw itch as the ref2 erence zero of the revo lving unit to reduce the accumulate erro r of mult i2po sit ioning. The system uses sp ring
mechanism to elim inate the gear clearance, to imp rove it s stability. The unit usesmat rix CCD to characterize the po sit ion of the end of the op t ical fiber of the fiber unit by measuring the po sit ion of ligh t spo t from the end of the op t ical fiber. Experiment s show that the po sit ioning unit can po sit ion the fiber quick ly and p recisely. It s p reci2 sion is 40Lm.
Key words　Op t ical fiber po sit ioning　Cont ro l　M at rix CCD