The results of layer-by-layer measurements of the coordinate distributions of the polarization ellipticity of laser radiation transformed by self-assembled polycrystalline soft matter films - bile films are presented. The efficiency of the method of 3D polarization mapping of polycrystalline networks in differentiating optically anisotropic films of bile from healthy donors and patients with type 2 diabetes mellitus and non-calculous cholecystitis is considered. High accuracy (90.3% ≤ Ac ≤ 93.1%) of differentiation of normal and pathological conditions was achieved.
This article illustrates a system for stabilizing objects in space based on integral fiber elements. The proposed system showed results commensurate with similar systems with a length of tens of kilometers of SMF-28 optical fiber, while using PANDA type optical fiber is only 200 m. In the work, a model of the system was developed and experimental studies of the response and angular velocity of the gyroscope were carried out.
One of the interesting areas of optical-electronic instrument engineering is the design of coherent optical spectrum analyzers, the principle of operation of which is based on performing the Fourier transformation by a lens. When choosing components for designing the optical system of a coherent spectrum analyzer, it is important to find a compromise between the accuracy of measurements and the cost of the device. In some cases, for example, for research at universities, it is advisable to use inexpensive blocks from household appliances and computer peripherals to create laboratory models of spectrum analyzers. In the article, inexpensive designs of optical spectrum analyzers are proposed, which ensure the acquisition of spatial-frequency spectra of images in real time. One of the variants of such structures is a nozzle for a digital camera.
In the work the non-standard system of w-parameters of the microwave quadripoles is proposed. a method of floating loads for the determination of w-parameters of microwave quadripoles is developed. the elements of the theory of the method of floating loads are proposed. new equations for determining the w-parameters of microwave quadripoles are obtained. the experimental setup for the determination of w-parameters of microwave quadripoles is developed. the results of experimental studies of w-parameters of the field transistor are obtained.
This paper is devoted to the study of methods for improving the capabilities of measuring large data arrays through the use of optically-controlled transparent and Blockchain technology. The research results are presented with the help of the developed method, which made it possible to evaluate the effectiveness of the proposed improvements ie the speed of data processing large sizes. In this paper, the main areas of application of the blockchain technology, its main properties are analyzed. During the work, the prospects for the development of this topic were determined, the main principle of the work of blockchain technologies and optically-controlled transparent. It has been determined that one of the main functions of the blockchain is its parallel processing and data analysis. With the help of the technology of the blockchain and with the help of optically controlled banners, a matrix filled with certain information was processed, we transformed each data cell with the hash-function into a hash-code. Also, the processing time and the hash function were investigated.
Photonic crystals, the artificially created multilayer structures with dielectric permittivity and geometric dimensions varying with a period comparable to the wavelength, were studied by the calculation of light interference in a given multilayer system. The developed calculation programs using the matrix method made it possible to obtain the optical characteristics (reflection, transmission, etc.) for any multilayer coatings. The focus was on the analysis of the influence of defects associated with the violation of the layer periodicity. Spectral dependences of the reflection coefficient, argument of Chebyshev polynomial and argument module of the Chebyshev polynomial are given. The calculation of the optical characteristics of multilayer coatings by the matrix method provided the opportunity to identify the presence of barrier zones for periodic and defective systems and to propose their use as the contrast or narrowband interference filter.
This work devoted to some approach to for improve of knowledge bases organization in optical data networks cluster based in modern, cutting edge technologies in knowledge bases which are composed of united data bases with POSTGRESQL, MONGO {DB}) big data access technologies. These environments can provide working in actual times with Big Data in multicomponent fiber optic data networks cluster. The proposed approaches and architecture can be used to create new generation optical distributed networks with same cluster, based on GRID architecture with highspeed optical channels (5NGi Optical Internet). Parallel GRID based architectural can effectively to work with artificial intelligence (AIs) algorithms and architecture.
An inscription of a Bragg grating on a typical telecommunications fibre is difficult to obtain. In inscribing a structure, special fibres with an increased germanium content or classic fibres subjected to the hydrogenation process are used. The following article analyses the dependence of the hydrogen pressure on the parameters of the structures produced, such as grating reflectivity, Bragg wavelength or full width at half maximum (FWHM). The article also verifies how the pressure in the hydrogenation process affects the time of inscribing structures. Two types of fibre were subjected to photosensitisation: the classic one and one with a higher content of germanium. The hydrogenation process was performed at three pressures of 50 bar, 100 bar and 190 bar. Hydrogenation took place under the ambient temperature conditions of the room in which the chamber was located.
Optoelectronic neuronal element on the n-type c-negatron is researched in paper. the offered neuron executes the main functions of neuron, such as spatial and temporal integration of optical (current) signals and has a threshold function of activating. theoretical basis of neuronal elements construction on the c-negatrons and computer simulations results of the neuron on the n-type c-negatron are shown in paper. advantages of the offered neuron element are schematic and technological simplicity, high speed, possibility of signal voltage amplification, low power consumption.
The structural scheme of the hydropulse device for strain hardening of materials is considered. Based on the block diagram of the device, its complete and simplified dynamic models are developed. On the basis of the dynamic model of the device and the scientifically grounded structure of assumptions, a mathematical model of the device was developed, the hydraulic link in which is presented as the Kelvin - Voigt body. For energy reasons, the choice of the force of the shock interaction of the piston - pulsator with the surface of the processed part is grounded. For energy reasons, the choice of the force of the shock interaction of the piston - pulsator with the surface of the processed part is grounded.
This paper presents the spectral properties of chirped tilted Bragg gratings (CTFBG) written on photosensitive optical
fiber by using phase mask technique and excimer laser. The dependencies of manufactured structures spectra on three
various values of chirp: 0,1 nm/cm, 1 nm/cm, 10nm/cm and gratings tilt angle in 0° to 2,5° range with 0,5° change have
been shown in all combinations. Influence of temperature changes in -40°C to 180°C range on measured spectra have
been investigated. We showed the dependencies of CTFBG spectral parameters in various cases of periodic refractive
index variations angle and different chirp values given in manufacturing process.
The aim of this work is the development of a reference source of subnanosecond pulses based on SiC breakdown LEDs. The micro-alloy technology of p-n junctions based on SiC-6H with a diameter of about 50 microns has been developed. The capacity of such structures does not exceed 10-20 pF. The high stability and current overload resistance of the samples were provided by the uniform microplasma breakdown structure. The breakdown electroluminescence spectrum of the investigated samples was flat and covered the range of 400-800 nm and the relaxation time did not exceed 0,25 ns (a time resolution of measuring system). The radiation power was about 10-6 W/A.
The spectral method of the jitter parameters estimation in fiber optics transmission systems is being suggested. The suggested method is featured with high accuracy at the expense of the statistical stability improvement of the results, obtained during the implementation of overlapping fast Fourier transform.
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