Journal
OPTICS LETTERS
Volume 35, Issue 19, Pages 3273-3275Publisher
OPTICAL SOC AMER
DOI: 10.1364/OL.35.003273
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- Irish Technological Research Sector
- Enterprise Ireland
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We report a simple, compact electronic speckle-pattern interferometer (ESPI) incorporating holographic optical elements (HOEs) for the study of out-of-plane vibration. Reflection and transmission HOEs provide reference and object beams in the interferometer. The alignment difficulties with conventional ESPI systems are minimized using HOEs. The time-average ESPI subtraction method is used to generate the fringe pattern and remove background speckle noise by introducing a phase shift between consecutive images. The amplitude and phase maps are obtained using path-difference modulation. (C) 2010 Optical Society of America
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