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Study on Electronic Subdivision of Grating MoiréFringe

Author: LvMengJun
Tutor: YouYouPeng
School: Nanjing University of Aeronautics and Astronautics
Course: Mechanical and Electronic Engineering
Keywords: Grating Moiré fringe Subdivision Tangent method Noise Phase
CLC: TH74
Type: Master's thesis
Year: 2008
Downloads: 408
Quote: 13
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Abstract


Grating measurement technique has a high-precision, high sensitivity , large dynamic range , easy to implement automation features can be realized on the measurement of the amount of displacement, velocity and other mechanical . To improve the measurement accuracy and resolution , to effectively control the cost of measurement , The Moire fringes electronics segmentation technique is widely studied and applied . The subdivision of Moiré fringe electronics technology in-depth study and proposed solutions to improve the accuracy and resolution of the subdivision . Summarized basic principles the Way and characteristics of the practical application of a variety of methods segments . Focus on research and segmentation of accuracy of the theoretical analysis of tangent method segments ; moire fringe signal on the basis of a conventional signal conditioning algorithm for noise control and phase correction , can greatly improve segmentation accuracy . Adaptive neural network algorithm is applied in order to obtain a high-quality signal , the the moire fringe signal noise reduction . The signal nonlinear mapping of neural network layer , so that the linear and non-linear noise can be effectively suppressed ; filtering step signal frequency constitutes a function of step dynamic adjustment algorithm adaptivity ensure broadband with filtering effect . The moire fringe filtered signal quality significantly improved. Based on the tangential method segments, a new phase error compensation algorithms , each phase angle of the short-cycle signal can be obtained through the processing of the segmentation of the signal interval , the real-time correction , effectively reducing the signal phase are not orthogonal caused segmentation error , and a detailed analysis of the condition of the realization of the algorithm . The simulation and experimental results show that the proposed algorithm can significantly improve the quality of moire fringe signal ; related content for improving the moire fringe subdivision precision electronics and multiples with the actual reference value .

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CLC: > Industrial Technology > Machinery and Instrument Industry > Instruments, meters > Optical instruments
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