LAMOST fiber positioning unit detection based on binocular vision

The distributive parallel-controllable fiber positioning system is a key designed for The Large Sky Area Multi-Object Fiber Spectroscopic Telescope (LAMOST). The focal surface of the telescope with a diameter of 1.75m is divided into 4000 individual domains.A mobile parallel control system is set to control all the units, so the 4000 fibers can all move separately.In open-loop operation mode, there is no data on positioning accuracy of the FPU after operation. In this paper, we present an algorithm base on binocular vision to detect the FPU’s position using the back illuminated image of LAMOST focal plane.