Publicado 12 números por año
ISSN Imprimir: 0040-2508
ISSN En Línea: 1943-6009
Indexed in
DYNAMIC SPECTRAL FILTERING OF SIGNALS IN OPTOELECTRONIC SYSTEMS OF TARGET DETECTION
SINOPSIS
In the paper, principles of the dynamic spectral filtering, which is a further development of the imaging spectroscopy, are generalized and developed. In contrast to the imagining spectrometers, the optoelectronic systems with dynamic spectral filtering implement a controllable spectral filtering which provides maximum suppression of spectral components of background radiation with a minimum attenuation of the optical signal from a target in the pre-detector region. The study is aimed at generalization and development of the principles of the dynamic spectral filtering in behalf of creation of optoelectronic systems of target detection by spectral features. It proves possible to reduce the problem of optimum extraction of optical signals against a noise background to solving the detection problem for signals with a priori known parameters used in the radar theory. The paper presents the principles of dynamic spectral filtering of optical emission. Also, algorithms of optimal detection of targets using spectral features and synthesis of optimal detector of optical signals are described. In the paper, quantitative characteristics of the detector are determined that make it possible to estimate the conditional probability of true detection of objects of interest in dependence on the signal-to-noise ratio with a constant false-alarm rate. The quantitative characteristics of the detector have been obtained on the assumption that target echoes and noise background follow the normal distribution law, and their correlation characteristics (correlation matrices of the noise background ant target echo) are identical. The possibility has been established experimentally of creation of a controllable acousto-optical selective device that provides spectral selection of two optical signals with different spectral compositions by means of changing the frequency component amplitudes of an ultrasonic wave. Three lasers operating in the red, green and blue spectral ranges are served as radiation sources. In the course of the experiment, the spectral selection was performed due to diffraction of a polychromatic laser emission by a multi-frequency ultrasound. The filtering process efficiency was determined from the value of picture contrast before and after applying the filtering procedure. It has been shown experimentally that using three spectral channels of selection it proves possible to enhance the contrast at the output by several times.
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Kupchenko L. F., Goorin O. A., Karlov V. D., Ponomar A. V., Rybiak A. S., Natarova A. O., Active electro-optical system with dynamic spectral processing of optical radiation, 2019 IEEE 8th International Conference on Advanced Optoelectronics and Lasers (CAOL), 2019. Crossref
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Kupchenko L.F., Karlov V.D., Rybiak A.S., Goorin О.А., Ponomar А.V., Aсtive electro-optical system of targets detection with dynamic spectral processing of optical radiation, Semiconductor Physics, Quantum Electronics and Optoelectronics, 24, 02, 2021. Crossref