Reconstruction of refractive indices distribution in 3D using a single pattern of multiple-beam interference fringes for online investigation of necking phenomenon

In this paper, a method of processing argon plasma images, obtained from the DC pseudo glow discharge technique, using two- and multiple-beam interference is suggested. This method is based on measuring the image fringe shift from the background interference fringes. Hence, this mapping of intensity shift is related to the electron density distribution of the argon plasma. Also, the refractive index of the plasma is computed from the electron density values. The contrast of the interferometer images in presence of plasma shift is investigated in both cases of two- and multiple-beam interference.

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XXXI New contributions to interferometry. Part V.—New multiple beam white light interference fringes and their applications

The London Edinburgh and Dublin Philosophical Magazine and Journal of Science ◽

10.1080/14786444508521499 ◽

1945 ◽

Vol 36 (255) ◽

pp. 225-236 ◽

Cited By ~ 18

Author(s):

S. Tolansky

Keyword(s):

White Light ◽

Multiple Beam ◽

Light Interference ◽

Interference Fringes ◽

White Light Interference

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Surface microtopography measurement of a standard flat surface by multiple-beam interference fringes at reflection

Optics and Lasers in Engineering ◽

10.1016/j.optlaseng.2009.12.015 ◽

2010 ◽

Vol 48 (5) ◽

pp. 543-547 ◽

Cited By ~ 18

Author(s):

D.G. Abdelsalam ◽

M.S. Shaalan ◽

M.M. Eloker

Keyword(s):

Flat Surface ◽

Multiple Beam ◽

Surface Microtopography ◽

Interference Fringes

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Studies on Multiple Beam Interference Fringes Formed on High Order Planes of Localization: Intensity Distribution and the Fringe Shift between Successive Planes of Localization

Optica Acta International Journal of Optics ◽

10.1080/713817932 ◽

1965 ◽

Vol 12 (2) ◽

pp. 205-212 ◽

Cited By ~ 2

Author(s):

N. Barakat ◽

A.S. Farghaly ◽

A. Abd-El-Azim

Keyword(s):

Intensity Distribution ◽

High Order ◽

Fringe Shift ◽

Multiple Beam ◽

Interference Fringes

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Determination of ordinary and extraordinary refractive indices of nematic liquid crystals by using wedge cells

Opto-Electronics Review ◽

10.2478/s11772-010-0009-8 ◽

2010 ◽

Vol 18 (2) ◽

Cited By ~ 24

Author(s):

J. Kędzierski ◽

Z. Raszewski ◽

M. Kojdecki ◽

E. Kruszelnicki-Nowinowski ◽

P. Perkowski ◽

...

Keyword(s):

Thin Film ◽

Liquid Crystals ◽

Nematic Liquid Crystals ◽

Monochromatic Light ◽

Refractive Indices ◽

Multiple Reflections ◽

Edge Angle ◽

Interference Fringes ◽

Monochromatic Light Beam

AbstractA new accurate and fast interference method for determining ordinary and extraordinary refractive indices of nematic liquid crystals is presented and discussed. The method relies on microscopic measurements of distances between interference fringes appearing in polarised parallel coherent monochromatic light beam transmitted normally to the surfaces through a wedge cell filled with a nematic. Both glass plates confining the cell are coated with a partly transparent thin film of metal which is deposited by evaporation in vacuum. Owing to the multiple reflections between the surfaces and a small edge angle, the interference fringes observed near the wedge apex edge are sharp and equidistant. To apply this method one needs only small amount of an investigated liquid crystal. Basic mathematical formulae and results of an experiment are briefly discussed.

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