Journal of Northeastern University Natural Science ›› 2019, Vol. 40 ›› Issue (6): 847-851.DOI: 10.12068/j.issn.1005-3026.2019.06.016

• Mechanical Engineering • Previous Articles     Next Articles

Off-Axis Digital Holographic Microscopic Phase Automatic Compensation Method

MA Shu-jun, LIU Wei-hua, ZHOU Peng-fei   

  1. School of Mechanical Engineering & Automation, Northeastern University, Shenyang 110819, China.
  • Received:2018-04-02 Revised:2018-04-02 Online:2019-06-15 Published:2019-06-14
  • Contact: MA Shu-jun
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Abstract: In the off-axis digital holographic microscopy, off-axis optical paths tend to cause tilted phase distortion during the digital reference light reconstruction, which seriously affects the quality of the reconstruction. A method of automatic distortion compensation is proposed to study the digital holographic reconstruction process. By processing the frequency domain of the hologram, the corresponding relationship between the angle of the first term and the DC term is found, and the multi-pixel coordinate calculation is used to obtain the corresponding tilted digital reference light. The digital reconstruction is performed using the tilted digital reference light, then the reconstructed phase is binarized, and the optimal compensation phase is found using the maximum connected region to realize the automatic phase compensation. The experiment proves that this method is effective and can realize the automatically eliminating tilt phase distortion.

Key words: off-axis, digital holographic microscopy, phase compensation, connected area

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