With the development of the spectral survey project, the miniaturization, high density, integration and high precision positioning requirements of the fiber positioning unit have become a general trend, which also puts forward higher technical requirements and challenges for the optical fiber positioning system. At the same time, fiber positioning technology also expects to achieve high-precision real-time monitoring and feedback system to form an effective closedloop control. This propose a the concept design of the fiber positioning real-time monitoring system with four-quadrant detector based on the parallel controllable fiber positioning technology of LAMOST.
Solving the problem of obstacle avoidance with K-means clustering analysis method is discussed in this paper. Firstly, applying the MATLAB to read digital elevation a few kilometers away from the lunar surface, and obtaining the elevation matrix of all points. Then the different heights of points into four grays for different shades are classified with K-means clustering analysis method. Finally, a safe landing area (coordinates, radius and velocity increment) is determined with clockwise spiral forward searching method starting from the landing center.
Simulation study of the stability lateral field distribution for a variety of shapes parallel-plane cavity with the Fox-Li
numerical iterative method is conducted in this paper, which gives the optical field amplitude distribution and phase
distribution after iterating any number of times. After calculation and simulation, we find that the strip cavity needs 245
times iterations to produce a stable field conditions, while rectangular and circular cavity need 103 and 114 times under
the same condition. Finally, the user interface for simulating the field distribution of a common parallel-plane cavity is
designed, which is conducive to the understanding and extensive application of the theory of laser transverse mode.