NDLI: Phase-shift extraction from twice-normalized light intensity changes recorded with random phase shifts

Content Provider	Springer Nature Link
Author	Adachi, Masaaki Sunada, Satoshi
Copyright Year	2014
Abstract	A simple phase-shift extraction algorithm is proposed for interferograms recorded with random phase shifts that vary over at least 2π. The phase-shift-dependent changes in the intensity at two pixels having different phases, selected from one frame, are taken out and normalized. The sum and difference of the two normalized changes are calculated, and both the changes are normalized again along the phase shifts. The normalized sum and difference become the cosine and sine of a term including the random phase shift, respectively. Thereby, the phase shifts are extracted from both twice-normalized intensity changes. An experiment using an interference microscope equipped with a piezoelectric-transducer positioner of an objective lens is conducted to estimate the validity of the algorithm. The algorithm is verified to have satisfactory results when the multiple interferograms used have a sample size of more than 15 frames recorded with random phase shifts.
Starting Page	522
Ending Page	525
Page Count	4
File Format	PDF
ISSN	13406000
Journal	Optical Review
Volume Number	21
Issue Number	5
e-ISSN	13499432
Language	English
Publisher	The Optical Society of Japan
Publisher Date	2014-10-03
Publisher Place	Japan
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	phase shift phase extraction random phase shifts interferometry vertical vibration Physics
Content Type	Text
Resource Type	Article
Subject	Atomic and Molecular Physics, and Optics

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