Mr. Yu Cheng Profile

Yu Cheng

at Fudan Univ

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Proceedings Article | 16 December 2019 Paper

Phase unwrapping and range enlargement in phase-shifting dual-wavelength digital holography

Yu Cheng, Xiangchao Zhang, He Yuan, Wei Wang, Shaoliang Li, Siping Peng

Proceedings Volume 11189, 1118908 (2019) https://doi.org/10.1117/12.2537464

KEYWORDS: Digital holography, Interferometry, Optical testing, Phase measurement

Read Abstract +

The dual wavelength interferometry in digital holography can eliminate 2π ambiguities with a large synthetic wavelength, but the measurement error tends to be amplified. In this paper, a new numerical algorithm is proposed to reduce the amplification error, and further expand the measurement range. The wrapped phase map associated with one wavelength is used to assist unwrapping the phase map associated with the other wavelength. Since these two phase maps correspond to the same step height, an exhaustive searching method is applied. The measurement error will not be amplified linearly with the synthetic wavelength, but controlled at the same level with the single wavelength interferometry. In consideration of the measurement errors such as the environmental vibration, instability of wavelength and so on, a tolerance is set to guarantee the stability of the solution. The performance and feasibility of the proposed algorithm is verified by the numerical demonstration.

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