杜光亮,张朝瑞,周灿林,司书春,李辉,雷振坤.一种改进的两步时域相位去包裹算法[J].光电子激光,2015,26(11):2187~2192 |
一种改进的两步时域相位去包裹算法 |
An improved two-step temporal phase unwrapping algorithm |
投稿时间:2015-08-24 |
DOI: |
中文关键词: 时域相位去包裹 灵敏度 相位测量轮廓术(PMP) |
英文关键词:temporal phase unwrapping sensitivity phase measuring profilometry (PMP) |
基金项目:国家自然科学基金(11172054,11472070)资助项目 (1.山东大学 物理学院,山东 济南 250100; 2.大连理工大学 工程力学系,辽宁 大连 116024) |
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中文摘要: |
针对时域相位去包裹方法在三维形貌测量时存在采 集图像幅数多、数据量大和处理时间长等问题,提出了一种改进的两步时域相位去包裹算 法。首 先,增加中间灵敏度投影条纹,将不同灵敏度光栅条纹投射到待测物体表面,由CCD相机采 集;再通过不同灵敏度级联,得到最 终灵敏度系数G值较大的去包裹相位数据。推导了两步时域相位去包裹算法 的初始相位条件。并进行了实际测量。结果表明,本文方法可实现高灵敏度三维形貌测量, 测量结果精度更高。 |
英文摘要: |
Servin et al proposed a 2-step temp oral phase unwrapping algorithm,which only needs 2extreme phase-maps to achieve exactly the same results as the standard temporal unw rapping method.But this method also has some problems.In order to optimize the range of sensitivity coefficient G and improve the measuremen t accuracy,an improved temporal phase unwrapping algorithm is proposed in this paper,which is an extension of Servin′s method.F irst,we add an intermediate sensitivity fringe pattern,project the fringe patterns with different sensitivities onto the object surface,and then co llect the deformed fringe patterns with a CCD camera.Then we obtain the unwrapped phase with larger sensitivity coefficient G by cascading the sensi tivity coefficients.We derive the initial phase conditions of the 2-step temporal phase unwrapping algorithm.Finally,the experimental eva luation is conducted to prove the validity of the proposed method.The results are compared with those of the method in Ref.[21] .The experimental results show that this method can achieve high sensitivity,and the results are more accurate. |
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