Indexed by:期刊论文

Date of Publication:2014-01-01

Journal:OPTICA APPLICATA

Included Journals:SCIE、EI

Volume:44

Issue:3

Page Number:451-461

ISSN No.:0078-5466

Key Words:wavefront measurement; fringe analysis; phase retrieval; fast Fourier transform (FFT); multifrequency heterodyne principle

Abstract: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.