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论文类型：期刊论文
发表时间：2014-01-01
发表刊物：OPTICA APPLICATA
收录刊物：SCIE、EI
卷号：44
期号：3
页面范围：451-461
ISSN号：0078-5466
关键字：wavefront measurement; fringe analysis; phase retrieval; fast Fourier transform (FFT); multifrequency heterodyne principle
摘要：An improved deflectometry for wavefront measurement using a composite fringe is proposed to reduce the projection fringes and improve the accuracy. The single composite fringe contains four fringes in different directions. It goes through the tested objects and then is captured by a CCD camera. Two high frequency orthogonal fringe patterns and two single period orthogonal fringe patterns can be obtained from the composite fringe by fast Fourier transform. The unwrapping of the wrapped phase of the high frequency fringe is accomplished by the corresponding single period fringe using a heterodyne method. The wavefront is reconstructed by the integration of partial derivatives. Using only one fringe, the proposed method is more applicable to dynamic wavefront measurement. The experimental results demonstrate that the proposed method can retrieve the complex wavefronts more accurately.