Instrument-making and information-measuring equipment

Ахроматизация и атермализация объективов инфракрасной техники

This paper considers the method of temperature influence indemnification to image quality of optical systems working in the infrared range of spectrum for the case of homogeneous temperature distribution through the system. The simultaneous achromatization of focusing knot is possible when passive athermalization is used. Rational problem decision of athermal and achromatic optical system designing is possible when the triplet including specific compositions of optical materials combined with specific mechanical housing materials is utilized.

Definition and Analysis of Metrological Characteristics of Oxygen Sensor

The purpose of this paper is to develop optimum designs of oxygen sensor, technologies of sensors, and new methods of processing initial signals aimed at increasing metrological characteristics of oxygen sensor. We investigate the influence of external (atmospheric pressure, ambient temperature, availability of impurity) and internal factors of the system (design features of oxygen sensors, materials of electrodes and gaze-diffusion membranes, electrolyte structure) on sensors’ metrological characteristics.

The Problems of Designing Coherent Spectrum Analyzers

The purpose of this paper is to improve methods for designing coherent spectrum analyzers. Methods of calculating generalized characteristics such as the working range of spatial frequencies, the spatial spectral resolution and the energy resolution are suggested in this paper. To develop the methods of calculating we consider the most common scheme in which the transparency locates in the front focal plane of the Fourier lens. As transparency, we take a rectangular aperture that has spatial spectrum described by sync functions.

Navigational System Exactitude for Automatic Landing of Unmanned Airplanes

The paper aims at solving the issue of defining the navigation system exactitude to fulfill unmanned airplane automatic touchdown on landing gear. Trajectories of automatic touchdown are designed. The mode of the autoflare program shaping comprising rigid and free parts is proposed. It permits to reduce an air part of landing distance and to improve the stabilization quality. In view of a flare path shaping mode performances limitations of navigation and attitude system as inequalities containing measurement errors and errors of stabilization of motion parameters are obtained.

Temperature Defocusing of the Image in Optical Systems

We obtain the working formulae. Applying the analytical method, they allow analyzing the temperature effect of optical and mechanical elements of optical system on value of the image temperature defocusing, formed by optical system. Abbe invariant is used to determine the segment, which indicates the position of the image plane relative to the last optical surface of the optical system and is dependent on the temperature magnitude.

Matching the Resolution of the Lens and Matrix of Medical Thermal Camera

The paper considers the interrelation between radius of the confusion lens circle and the period matrix of modulation transfer function (MPF) with the concurrence lens and the detector. We propose two criteria of the alignment lens and the detector. The first criterion is the equality of the lens and matrix on the level while the second criterion is the equality of the MPF lens detector at the Nyquist frequency. Finally, we uncover the reduced dependence of the normalized radius of the circle of confusion on the value of the contrast of the lens alignment

Modeling of Discrete Non-Diffracting Beams

In this paper, we propose the technique for computing the scheme of holographic recording on the photopolymer of photonic structures, which create various discrete non-diffracting beams. We study how a number of laser beams, scheme geometry and relative phase shifts between laser beams impact the resultant transverse intensity and phase distribution in the interference structure. Moreover, we numerically model such structures as striped, triangular, square and hexagonal structures, specifically kagome and honeycomb pattern.

Metrological Characteristics of a Diffuse Emitter Based on the Integrating Sphere with Light-Emitting Diodes

The aim of this work is developing, with the help of the developed numerical method, analyzing the impact of the main elements of DV on its metrological characteristics and development on this basis, recommendations for designing next-generation high-precision IS. To identify the main parameters of a spherical surface that affect on formed brightness field.

The Numerical Method of Analysis of the Diffuse Emitter Intensity Based on the Integrating Sphere

This paper develops a novel numerical method for the analysis of the diffuse transmitter based on the integrating sphere, which allows evaluating the parameters of the field formed by the emitter brightness taking into account the effects of micro- and macrostructure and its sources of radiation. The method is based on the geometrical ray propagation laws in the space, their specular and diffuse reflection on surface of the sphere and its elements such as the hump, pit, fence, patch.

Circuit Criteria of the Non-Imaging Fiber-Optic Systems Efficiency

The paper proposes the circuit criteria of NIFOS efficiency connected with the converter operators of energy and information system channels. We perform the analytical calculation of the proposed criteria by the ray-tracing method as well as by utilizing the specific software. These circuit criteria can be proposed as an instrument for NIFOS structural parametrical optimization. The use of proposed analytical circuit criteria allows not only promptly assessing the NIFOS technical realization efficiency, but also implementing the comparative analysis of competing NIFOS circuit designs.