Phase unwrapping based on transport-of-intensity equation with two wavelengths

Hong Cheng; Jincheng Wang; Yaoli Gao; Quanbing Zhang; Sui Wei

doi:10.1117/1.OE.58.5.054103

29 May 2019 Phase unwrapping based on transport-of-intensity equation with two wavelengths

Hong Cheng, Jincheng Wang, Yaoli Gao, Quanbing Zhang, Sui Wei

Author Affiliations +

Optical Engineering, Vol. 58, Issue 5, 054103 (May 2019). https://doi.org/10.1117/1.OE.58.5.054103

Abstract

The phase obtained in the interferogram is generally not continuous real phase information. Therefore, a phase larger than 2π will have a phase jump called wrapped phase. The traditional phase unwrapping algorithm usually requires a large amount of computation, and in reality, phase unwrapping is often a complex and morbid inverse problem due to factors such as speckle noise, random perturbations, low modulation, and phase discontinuity, and the processes of unwrapping of some algorithms depend on the path chosen. Therefore, it is difficult to obtain an accurate absolute phase under actual conditions. To improve the accuracy of the absolute phase, a phase unwrapping algorithm based on the transport-of-intensity equation with two-wavelength illumination is proposed. The experimental results illustrate that the proposed method not only improves the accuracy of absolute phase but also holds a good antinoise performance.

Citation Download Citation

Hong Cheng, Jincheng Wang, Yaoli Gao, Quanbing Zhang, and Sui Wei "Phase unwrapping based on transport-of-intensity equation with two wavelengths," Optical Engineering 58(5), 054103 (29 May 2019). https://doi.org/10.1117/1.OE.58.5.054103

Received: 7 March 2019; Accepted: 9 May 2019; Published: 29 May 2019

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