Test And Control Of The New LAMOST Optical Fiber Positioning Units Based On Zigbee Network

LAMOST(Large Sky Area Multi-Object Fiber Spectroscopy Telescope)is a reflective SMT telescope designed and developed by Chinese scientists.Its scale is equivalent to the largest 8-10 meter telescope in the world and has reached the international advanced level in active optics and optical fiber positioning.It is a powerful tool for large field of view and large sample astronomy.The first phase of LAMOST was put forward from the project proposal to the implementation of the project,and it was put into use after it was completed.So far,LAMOST has undergone 10 years of inspections and the work has been very fruitful.But along with the process of use,some of them have also been exposed,plus when.Today's literary research requires more and more observation instruments.Therefore,it is necessary to upgrade the existing problems of LAMOST based on the existing technologies.The main problems are as follows:1.The focal plane of the existing focal plane of the optical fiber positioning unit is too large for the reflected light of the active mirror MA,which makes the optical positioning unit on the focal plane receive the optical information of the passive spherical mirror MB reduced,which is unfavorable for observation.2.Today's optical fiber positioning units have a high frequency of communication errors,so the communication quality between nodes needs to be improved.3.Due to the distribution of 4000 drive circuit boards on the back of a 1.75m-diameter focal panel,heat dissipation is also a big problem.Excessively concentrated heat will lead to reduced environmental conditions and safety.Aiming at the above-mentioned problems,the miniaturized design of the LAMOST next-generation fiber positioning unit enables the fiber positioning unit to be reduced to 16mm on the basis of the original 28mm diameter.This article focuses on the miniaturized design of the drive unit of the fiber positioning unit.Based on the existing structure,TI's ZigBee-related products,namely the on-chip system CC2530 as the micro-controller of the fiber positioning unit,are used to optimize the cascade design of the board level.With the layout of components and components,the driving part of the positioning unit was reduced from the original 103mm*14mm to 79mm*9.5mm,the area was reduced by 47%,and the accuracy of the optical fiber positioning unit after the design was tested.The measurement results show that:1)A single unit meets the target area within three steps(error 10 um);2)When multiple units are running at the same time,the accuracy requirement of 10 um is satisfied in each operation mode within one hundred steps.Through the final test experiment,the test control performance of the new generation of child nodes meets the design requirements to some extent.