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18 July 2014A high-density integrated optical focal plane positioning system
Modern multi-spectral sky survey requires the use of greater quantity and smaller size of the fiber positioner. This paper
presents a high-density integrated optical focal plane positioning system, which includes 150 groups fiber positioning
module and a 1 meter diameter honeycomb-shaped focal plane framework in that have about 150 hexagonal hole. Each
module has a pedestal includes 37 holes and 37 fiber positioner of 11.8 mm diameter. 37 fiber positioner integrated can
greatly reduce the difficulty of the design and installation. The modular structure also facilitates maintenance and
replacement in the field of telescope, and greatly reduce the difficulty of the drive system design. Numerical simulation
results show that: the honeycomb-shaped focal plane framework whose thickness is 100mm and who is in a variety of
working positions and load conditions, its maximum deformation is about 0.02mm. This meet the needs of the
general astronomical telescopes. The positioning accuracy of test 12mm diameter fiber positioner is about 0.04 mm,
and it is expected to reach 0.01mm if have the closed-loop control.