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Research of Temporal Speckle Pattern Interferometry for in-plane Measurement

Author: DengYan
Tutor: GaoZhan
School: Beijing Jiaotong University
Course: Optical Engineering
Keywords: Speckle interferometry Wavelet Transform In-plane displacement Heterodyne interferometer Time Series
CLC: O436.1
Type: Master's thesis
Year: 2011
Downloads: 32
Quote: 0
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Abstract


Speckle interferometry technology has a non-contact , high sensitivity and audience measurement , the deformation of the surface roughness , stress , strain, and vibration , static and dynamic measurement of a wide range of applications in engineering components and materials performance prospects. In the case of speckle interferometry measurements from the surface has been widely studied in this paper for the in-plane displacement from the wavelet transform heterodyne time sequence speckle interferometry technology and the introduction of the heterodyne time sequence speckle interferometry technology were studied. Made in this paper are: ( 1) the preparation of a wavelet transform - based phase recovery algorithm and procedures , computer simulation study of the displacement of an object , and comparative analysis with Fourier transform - based phase recovery results . ( 2) to build a heterodyne time sequence speckle interferometry system , the introduction of time measurement parameters that traditional speckle interferometry . The experimental measurement of the displacement in the object plane , respectively, using wavelet transform and the Fourier transform data recovery phase and displacement , and to verify the feasibility of the wavelet transform algorithm in the actual measurement of the self - prepared . (3) to build a difference time of the introduction of foreign sequences speckle interferometry measurement systems, and difference frequency generation means is introduced in the above system . The completion of the the object plane displacement measurement experiment , and the wavelet transform and Fourier transform of the recovery phase and displacement . The experiments show that the measurement system introduced heterodyne more accurate judgment of the displacement of small changes and non-linear changes , while enhancing anti-interference ability and stability of the system , to improve the measurement accuracy .

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CLC: > Mathematical sciences and chemical > Physics > Optics > Physical optics ( wave optics ) > Interference and diffraction
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