Paper
23 October 2001 Specification of spectral line shape and dispersion of a medium by self-imaging and moire techniques
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Abstract
Due to finite width of a spectral line, the visibility of the more fringes, formed by a grating and the image of another similar grating, produced by self-imaging technique, reduces by the increase of the image order. This effect has been exploited to specify the line shape, by taking Fourier transform from the visibility curve of the more fringes. The technique also renders to specify the non symmetric spectral line shapes, which are very difficult to determine by interferometric techniques. When a dispersive material, liquid or solid, is held between the gratings the visibility curve changes. It is shown that by comparing the Fourier transforms of the visibility curves obtained with and without sample, the dispersion function of the latter can be specified.
© (2001) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Mohammad Taghi Tavassoly and Mohammad Abolhassani "Specification of spectral line shape and dispersion of a medium by self-imaging and moire techniques", Proc. SPIE 4398, Optical Measurement Systems for Industrial Inspection II: Application in Industrial Design, (23 October 2001); https://doi.org/10.1117/12.445570
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KEYWORDS
Moire patterns

Visibility

Fourier transforms

Refractive index

Interferometry

Sensors

Solids

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