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Belozerov A.F.,State Institute of Applied Optics
Optoelectronics, Instrumentation and Data Processing | Year: 2014

Basic technologies used to develop shadowgraphs, interference devices, and schlieren systems of the first and second generations failed to solve some problems of modern gas-dynamic experiments, first of all, creation of comparatively inexpensive and compact systems for optical and physical measurements of gas-dynamic fields (visualization fields) with sizes of 800–1000 mm and more. The demand for unique optical systems for wind tunnels and ballistic ranges is expected to increase in the near future: it is only these tools that can ensure adequate experimental investigations of flows around airplane, helicopter, future flying vehicle, car, and missile models whose scales are close to real ones. (In wind tunnels, the gas flow impinges onto a motionless model, e.g., of a flying vehicle; aeroballistic ranges allow direct modeling of the motion of examined bodies.) New capabilities of optical methods of gas flow research are implemented: a posteriori investigation of wave fields deformed after passing through the gas flow, increasing the sensitivity of optical measurements by one or two orders of magnitude, and manyfold increase in the amount of information obtained in a complex gas-dynamic experiment. Advanced optical technologies are used to solve these problems. © 2014, Allerton Press, Inc. Source

Gainutdinov I.S.,State Institute of Applied Optics | Azamotov M.Kh.,State Institute of Applied Optics | Galiev A.N.,State Institute of Applied Optics | Nurullin I.Z.,State Institute of Applied Optics | And 2 more authors.
Journal of Optical Technology (A Translation of Opticheskii Zhurnal) | Year: 2015

This paper discusses questions of the development of a protective antireflection coating with a diamond like layer for germanium windows of thermal-vision devices. The hybrid coating thus developed has enhanced transmission in the 8-12-μm region by comparison with an ordinary diamondlike coating. © 2015 Optical Society of America. Source

Agachev A.R.,State Institute of Applied Optics | Belov I.Yu.,Kazan Federal University | Bochkarev V.V.,Kazan Federal University | Daishev R.A.,Kazan Federal University | And 5 more authors.
Journal of Experimental and Theoretical Physics | Year: 2010

The results of testing local position invariance, which is a constituent of the Einstein equivalence principle, in a "null" gravitational redshift experiment are reported. The processing of the experimental data collected during the five-month operation of a double-c avity laser system, where one cavity operates in the free generation mode and the frequency of the second cavity is stabilized with the nonlinear ultranarrow absorption resonance of the methane molecule, has confirmed the universality of the gravitational redshift law at a level of 0.9%. This result almost doubly improves the best existing accuracy (1.7%) of testing local position invariance for clocks of different physical natures. © 2010 Pleiades Publishing, Ltd. Source

Znamenskii M.Yu.,State Institute of Applied Optics | Lukashevich Ya.K.,State Institute of Applied Optics | Skochilov A.F.,State Institute of Applied Optics | Fedulova N.A.,State Institute of Applied Optics
Journal of Optical Technology (A Translation of Opticheskii Zhurnal) | Year: 2014

This paper discusses transmissive ruled diffraction gratings. Recommendations are given concerning the choice of their design and parameters that provide high diffraction efficiency in the specified spectral region, in particular for determining the optimum line frequencies. Examples are given of diffraction gratings actually used for the UV, visible, and IR regions, and it is shown that there is good correlation between their calculated and experimental characteristics. © 2014 Optical Society of America. Source

Tugarinov S.N.,Rosatom State Corporation for Atomic Energy | Belokopytov A.A.,State Institute of Applied Optics | Kulakov D.M.,Troitsk Institute for Innovation and Fusion Research | Lukin A.V.,State Institute of Applied Optics | And 7 more authors.
Instruments and Experimental Techniques | Year: 2016

A tri-band high-resolution spectrometer, which was designed for performing diagnostics on the ITER facility using the charge-exchange recombination spectroscopy (CXRS), is described. The CXRS allows measurements of such plasma parameters as the ion temperature, the speed of the toroidal and poloidal plasma rotation, and the concentration of light impurities. The spectrometer is based on three transparent holographic diffraction gratings and is designed to operate simultaneously in three spectral bands: 468 ± 6 nm, 529 ± 6 nm, and 656 ± 8 nm. The results of measuring the main performance parameters of the transparent diffraction gratings and the spectrometer as a whole are presented. It was established that the characteristics of the developed spectrometer satisfy the requirements for the spectroscopic equipment for the ITER CXRS diagnostic system. © 2016, Pleiades Publishing, Inc. Source

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