Four-step spatial phase-shifting shearing interferometry from moiré configuration by triple gratings.
A spatial phase-shifting shearing interferometry is presented in this paper. The whole optical configuration is simple and consists of three Ronchi gratings. Four phase-shifted shearing interferograms can be obtained simultaneously. The explicit intensity distributions of shearing interferograms are given and a corresponding four-step spatial phase-shifting algorithm is proposed to extract phase information from the new interferometry. This spatial phase-shifting configuration is applied to extract phase projection of a propane flame and a mathematical error analysis is presented.
Department of Information Physics & Engineering, Nanking University of Science & Technology, Nanking 210094, China. sy0204@mail.njust.edu.cn
Yang
Y
Song
Yunyun
Y
Chen
Jia
J
Wang
Nan
N
Sun
Anzhi
A
He