(r5) LGSOSM < Keck/NGAO

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---++NGAO LGS Object Selection Mechanism page

---++++Nomenclature
---++++++LGS WFS assembly
This is the entire LGS WFS package containing the 9 LGS WFS units, LGS OSM and all structure required to hold them together

---++++++ LGS WFS unit
A modular unit that contains all the LGS WFS components for single LGS channel. There are 9 LGS WFS units.

---++++++LGS OSM
The LGS Object Selection Mechanism. This selects the LGS stars across the LGS field of view and feeds them to the relevant LGS WFS channel.


---+++++December 12th, 2007
LGS WFS unit and OSM first draft concepts:
   * [[http://www.oir.caltech.edu/twiki_oir/pub/Keck/NGAO/AOSystemDesign/LFSWFS-dec2007-pickoff-schem.jpg][First draft pickoff concept]]
   * [[http://www.oir.caltech.edu/twiki_oir/pub/Keck/NGAO/AOSystemDesign/LFSWFS-dec2007-closeasterism.jpg][First draft pickoff concept shown with 5star close asterism]]
   * [[http://www.oir.caltech.edu/twiki_oir/pub/Keck/NGAO/AOSystemDesign/ngaolgs-121207-pickoffsi002.pdf][Hand drawn sketch of cross section through pick-off]]
   * [[http://www.oir.caltech.edu/twiki_oir/pub/Keck/NGAO/AOSystemDesign/ngaolgs-121207-wfsunit003.pdf][Hand drawn ketch of WFS unit as a whole]]
   * [[http://www.oir.caltech.edu/twiki_oir/pub/Keck/NGAO/AOSystemDesign/ngaolgs-121207-channel004.pdf][Hand drawn sketch of WFS channel]]
   * [[http://www.oir.caltech.edu/twiki_oir/pub/Keck/NGAO/AOSystemDesign/ngaolgs-121207-pickoffop005.pdf][Hand drawn sketch of optical path through pick-off]]
   * [[http://www.oir.caltech.edu/twiki_oir/pub/Keck/NGAO/AOSystemDesign/ngaolgs-121207-mechcount006.pdf][Mechanism count for this LGS WFS unit architecture]]

---+++++December 15th, 2007
   * [[http://www.oir.caltech.edu/twiki_oir/pub/Keck/NGAO/LOWFSOSM/WFS_vol_req.pdf][Viswa's description of all NGAO WFS channels (LGS, TT, TTFA, TWFS and NGS HOWFS)]]

---+++++January 16th, 2007
   * [[http://www.oir.caltech.edu/twiki_oir/pub/Keck/NGAO/LOWFSOSM/pickoff-definition.xls][Pick-off arm definition table v1]]

---+++++March 11th, 2008
   * [[%ATTACHURL%/LGSWFS-assem.png][LGSWFS assembly concept drawing (png)]]



-- Anna Moore and Viswa Velur - 16th Jan 2007