Deformation analysis of MEMS structures using modified digital moiré methods

Zhanwei Liu, Xinhao Lou, Jianxin Gao

    Research output: Contribution to journalArticlepeer-review

    Abstract

    Quantitative deformation analysis of micro-fabricated electromechanical systems is of importance for the design and functional control of microsystems. In this paper, two modified digital moiré processing methods, Gaussian blurring algorithm combined with digital phase shifting and geometrical phase analysis (GPA) technique based on digital moiré method, are developed to quantitatively analyse the deformation behaviour of micro-electro-mechanical system (MEMS) structures. Measuring principles and experimental procedures of the two methods are described in detail. A digital moiré fringe pattern is generated by superimposing a specimen grating etched directly on a microstructure surface with a digital reference grating (DRG). Most of the grating noise is removed from the digital moiré fringes, which enables the phase distribution of the moiré fringes to be obtained directly. Strain measurement result of a MEMS structure demonstrates the feasibility of the two methods.
    Original languageEnglish
    JournalOptics and Lasers in Engineering
    Volume48
    Issue number11
    DOIs
    Publication statusPublished - 2010

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