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A quarter-wave phase-stepping algorithm for fiber-optic electronic speckle pattern interferometry using zero-crossing triggers

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2 Author(s)
Hyoung-Jun Park ; Div. of Electron. & Inf. Eng, Chonbuk Nat. Univ., Jeonju, South Korea ; Minho Song

An efficient phase-stepping method for the use in fiber-optic electronic speckle pattern interferometry is proposed. A fiber-optic Michelson interferometer is phase-modulated, and the zero-crossing points of a back-reflected interference signal, that have consecutive pi phase difference, are used to trigger the charged-coupled device camera to capture specklegrams with pi/2 phase difference. A phase error of less than 3 mrad with 100-Hz image capture speed has been obtained in an open-loop configuration. Also, it has been experimentally shown that the phase-stepping accuracy of the proposing method does not depend on the nonlinear actions of the phase modulator

Published in:

IEEE Photonics Technology Letters  (Volume:18 ,  Issue: 16 )