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Small Angle Measurement Technology on Second Order of Accuracy and Its Application in Space Vehicle

Author: WangWenLiang
Tutor: TanJiChun
School: National University of Defense Science and Technology
Course: Optics
Keywords: Arcseconds Small angle measurement Moiré fringe Two plane mirror multiple reflection method Fabry - Perot interferometer Digital Image Processing
CLC: TP391.41
Type: Master's thesis
Year: 2010
Downloads: 95
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Abstract


The small angle is one of the important parameters of space measurements . The goniometer of traditional aerospace technology is difficult to meet the demand of precision and light small such . For Aerospace Survey follows the demand of the three proposed new method to measure the order of three-dimensional angle arcseconds : 1 . Moire fringe autocollimator combination of demand for small changes in the measure the deformation of the satellite payload installation location the principle of orthogonal combination of raster and digital image processing technology to achieve the pitch angle and yaw angle arc-second measurement program ; using Talbot self - imaging principle , moire fringe arcsec roll angle measurement program ; verify experimental results : the measurement method of the pitch angle and yaw angle measurement accuracy of 0.3 '' roll angle measurement error is less than ± 1'' measurement range of ± 30 ' . Asian angle . Measuring satellite truss payload small angle relative to the reference deflection demand amplification principle , multiple reflection angle between the two mirror -based laser , CCD camera real-time monitoring of changes in the spot position , the pitch angle and yaw angle seconds measurement ; verify experimental results show that : the number of reflections seven , the measurement accuracy of 0.1 '' , the measurement range of 340 '' . Substituted with a Fresnel prism the autocollimation angle measuring plane mirror , with return to a change of position of the two spots is detected by a CCD camera , to achieve a three-dimensional small angle measurement . For measuring the relative angular displacement between the spacecraft components , micro-vibration and beam to precisely target demand Fabry - Perot interferometer principle of small-angle measurement ; simulation verify the feasibility and practicality of the proposed method , measurement error is less than 2'' ; overview based on optical reflection small angle measurement principle , devices and features . In this paper, digital image processing technology used in optical angle measuring device , to improve measurement accuracy . The comparative study of the coordinates of the laser spot centroid extraction process , centroid , weighted centroid Hough transform circle fitting . Moire fringe processing , focus on the stripe centerline extraction algorithm based on the Hough transform . Angle measurement program has used the device is light and small , high reliability, and high precision of the design and development of precision better than the arcsecond level spaceborne angle measurement system has practical value .

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CLC: > Industrial Technology > Automation technology,computer technology > Computing technology,computer technology > Computer applications > Information processing (information processing) > Pattern Recognition and devices > Image recognition device
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