Acta Optica Sinica, Volume. 31, Issue 11, 1112005(2011)
Anti-Disturbance Phase-Shifting Interferometry Method Time-and-Frequency-Domain
Because interferometry is highly sensitive to disturbance such as vibration and air flow, a time-and-frequency domain (TFD) interferometry is proposed. A large number of continuous phase-shifting interferograms are captured. A distorted series of phase variety during fringe capturing is obtained through wide bandwidth filter to the spectrum of intensity series from a particular pixel, and then a linear statistic of it gives the measuring result of initial phase. With a large enough number of frames, the linear statistic efficiently reduces random noises to zero. And influences introduced by other non-random disturbances are astringed into a value which is independent of the index of pixels and therefore does not influence the shape of the whole wavefront. A simulation confirms the feasibility of the TFD method, and an experiment is carried out applying TFD method in a mechanical phase-shifting interferometric system fixed in a normal laboratory environment. The result prettily matches that from a FISBA interferometer, which verifies the anti-noise ability of TFD method.
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Wang Ming, Hao Qun, Zhu Qiudong, Hu Yao. Anti-Disturbance Phase-Shifting Interferometry Method Time-and-Frequency-Domain[J]. Acta Optica Sinica, 2011, 31(11): 1112005
Category: Instrumentation, Measurement and Metrology
Received: Apr. 12, 2011
Accepted: --
Published Online: Sep. 27, 2011
The Author Email: Ming Wang (wang0425@gmail.com)