Study of object surface characteristics using an acousto-optic tunable filter

Boris Gurevich; Sergey Andreyev; Andrey Belyaev; Vyacheslav Chelak; Japar Ismailov

doi:10.1117/12.622710

29 September 2005 Study of object surface characteristics using an acousto-optic tunable filter

Boris Gurevich, Sergey Andreyev, Andrey Belyaev, Vyacheslav Chelak, Japar Ismailov

Proceedings Volume 5953, Acousto-optics and Photoacoustics; 59530W (2005) https://doi.org/10.1117/12.622710
Event: Congress on Optics and Optoelectronics, 2005, Warsaw, Poland

Abstract

Acousto-optic tunable filters (AOTF) represent a very strong tool for study the features of different surfaces, especially if these features depend on the spectral dispersion of the light reflection indicatrix form and position. The typical sample of the problem connected with the surface features definition is the problem of recognition of the surface relief which is used for different objects genuineness. The surface relief can represent a sum of a number of diffraction gratings, oriented in different directions and having different spacings. If the studied surface is illuminated by light of variable wavelength, the reflected light varies correspondingly its intensity and direction. The variable wavelength of light can be provided by AOTF whereas spatial and temporal distribution of the reflected light can be registered by 2-D CCD array. The AOTF which is used for the surface study, gas been manufactured using acousto-optic Bragg cell based on tellurium dioxide single crystal. The interaction configuration in the cell corresponds to a non-collinear AOTF. The luminous flux at the AOTF output can be characterized by the controlled central wavelength, controlled spectral selectivity, and controlled form of AOTF spectral characteristic. The data measured by means of CCD array, are compared with the sample data using special software.

Citation Download Citation

Boris Gurevich, Sergey Andreyev, Andrey Belyaev, Vyacheslav Chelak, and Japar Ismailov "Study of object surface characteristics using an acousto-optic tunable filter", Proc. SPIE 5953, Acousto-optics and Photoacoustics, 59530W (29 September 2005); https://doi.org/10.1117/12.622710

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KEYWORDS

Acousto-optics

Diffraction gratings

Crystals

Reflectivity

Tunable filters

Bragg cells

Charge-coupled devices

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