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ISSN: 1023-5086

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ISSN: 1023-5086

Scientific and technical

Opticheskii Zhurnal

A full-text English translation of the journal is published by Optica Publishing Group under the title “Journal of Optical Technology”

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DOI: 10.17586/1023-5086-2023-90-11-79-89

УДК: 535.8

Spatial and spectral correction of acousto-optical videospectrometer

Sharikova M.O., Balandin I.A., Batshev, V.I., Kozlov A.B.

Full text on elibrary.ru

Publication in Journal of Optical Technology

For Russian citation (Opticheskii Zhurnal):

Шарикова М.О., Баландин И.А., Батшев В.И., Козлов А.Б. Пространственно-спектральная коррекция акустооптического видеоспектрометра // Оптический журнал. 2023. Т. 90. № 11. С. 79–89. http://doi.org/10.17586/1023-5086-2023-90-11-79-89

 

Sharikova М.O., Balandin I.A., Batshev V.I., Kozlov A.B. Spatial and spectral correction of acousto-optical videospectrometer [in Russian] // Opticheskii Zhurnal. 2023. V. 90. № 11. P. 79–89. http://doi.org/10.17586/1023-5086-2023-90-11-79-89

For citation (Journal of Optical Technology):

M. O. Sharikova, I. A. Balandin, V. I Batshev, and A. B. Kozlov, "Spatial and spectral correction of an acousto-optical imaging spectrometer," Journal of Optical Technology. 90 (11), 684-690 (2024). https://doi.org/10.1364/JOT.90.000684

Abstract:

Subject of study. Spatial-spectral distortions arising from acousto-optic diffraction, which must be taken into account when constructing an optical system and calibrating an acousto-optical device. Aim of study. Spatial and spectral calibration of videospectrometers based on acousto-optical tunable filters. Technique for equalizing the transmittance of the acousto-optical tunable filter in the entire working spectral range. Method. To obtain undistorted data, it is necessary to correct both spectral and spatial inhomogeneities. The calibration procedure consisted of hardware spectral tuning of the acousto-optical device and software-mathematical correction. The transmission function of the acousto-optical tunable filter is controlled by two parameters: frequency and power of ultrasound, which in turn are determined by the frequency and effective amplitude of the electrical signal. The frequency determines the position of the transmission function, that is, the wavelength of the acousto-optical tunable filter. The amplitude sets the ultrasound power, which determines the intensity of the radiation passed through the acousto-optical tunable filter. Full consideration of the non-uniformity of the transmission coefficient in the entire spectral range is achieved by post-processing. Main results. A technique for leveling the radiation power by changing the supplied ultrasound power is proposed. The developed software makes it possible to minimize the distortions introduced by acousto-optical tunable filters in order to visually evaluate information. The technique was tested on a near-infrared videospectrometer with double acousto-optic filtering. Practical significance. The presented method makes it possible to carry out hardware calibration of hyperspectral devices based on acousto-optical tunable filters, as well as to implement software correction of the displayed results in real time. The developed method is universal and suitable for other videospectrometers based on acousto-optic filtering. It will allow raising acousto-optic methods to a higher level both in the reliability of the data obtained and in the convenience of using such devices.

Keywords:

acousto-optics, acousto-optical tunable filter, acousto-optical videospectrometer, hyperspectral imaging, spatial and spectral calibration

Acknowledgements:

the work was carried out within the framework of the State Assignment of the STC UP RAS (project FFNS-2022-0010). The results were obtained using the equipment of the Center for Collective Use of the STC UP RAS

 

 

OCIS codes: 230.1040

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