Phase-shifting moiré interferometry based on a liquid crystal phase modulator

Horng Jou Wang, Jiun Yeu Chen, Chia Ming Liu, Lien Wen Chen

Research output: Contribution to journalArticlepeer-review

2 Citations (Scopus)


A new method for phase-shifting moiré interferometry is proposed and studied experimentally. A nematic liquid crystal cell is employed as a phase modulator to realize the phase-shifting technique for the conventional moire interferometry. The phase retardation of the liquid crystal cell is calibrated by measuring transmitted light intensities. By letting one of coherent beams pass through a liquid crystal cell and controlling the phase retardation via suitable voltages across the cell, the phase map that provides quantitative data regarding the in-plane surface displacement can be created. The use of the liquid crystal phase modulator in the moiré optical arrangement has several advantages over alteqrnative methods.

Original languageEnglish
Pages (from-to)1-6
Number of pages6
JournalOptical Engineering
Issue number1
Publication statusPublished - 2005 Jan 1

All Science Journal Classification (ASJC) codes

  • Atomic and Molecular Physics, and Optics
  • Engineering(all)

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