Research On Alignment And Adjustment Method Of Large-scale IFU Microlens Array And Optical Fiber Array

The integral field of view unit is an important device in the spectral imaging technology,especially the microlens array plus the fiber array integral field of view unit has the advantages of high energy utilization and flexibility of the spectrometer.However,the difficulty in manufacturing this type of integral field of view unit is that a large number of microlenses and optical fibers need to be aligned with high precision,which puts forward higher requirements for the manufacturing and installation process.This article mainly completes the alignment of the 63×64×2 microlens array in the FASOT project through modeling simulation and experimental operation.This thesis mainly carried out the following tasks:Firstly,the alignment of the microlens array and the optical fiber array is achieved by gluing two array plates arranged in the same size.The design parameters of the microlens array are introduced.The optical fiber array is realized by embedding in a microplate.The design parameters of the optical fiber are determined according to the size error of the microlens and the microplate.The arrangement relationship between the array end of the integral field of view unit and the optical fiber line sequence at the slit end is determined.Then,the modeling and simulation work of microlens array alignment was carried out.Ignore the error of the size of the microlens and the microplate,the unevenness between the optical fibers and other errors to establish an ideal model.The spot image near the focal point of the microlens was measured,and the gray value of the image was used to replace the energy intensity to establish a light field model.Use the optical field model to integrate the core area to obtain the luminous flux of the core.Different offsets represent the difference between the integration area and the integrand.Decompose the offset of the microlens array into six degrees of freedom,calculate the tangential and axial offset of each small microlens under each degree of freedom offset,and then calculate the fiber coupling ratio according to the previous integral calculation method Distribution.By linearly superimposing each degree of freedom,the coupling rate distribution law for any deviation can be obtained.Based on the simulation results,it is concluded that the pitch angle and the yaw angle have little influence,and the axial deviation and the roll angle have larger influence.Finally,a set of microlens alignment detection device was designed and built.The collimator,the pre-aligned microscopic imaging system,the array end of the integrated field of view,the slit end,the microlens adjustment table,and the scanning detection system have been completed.Design a set of motor operation control system and camera to collect pictures and process system.The simulation was performed again at a distance of 700 microns from the focal point,and several typical distribution patterns were summarized,and the microlens adjustment and installation work was completed.