Instrument-making and information-measuring equipment

Temperature Measurement Uncertainty of Patient by Medical Thermal Imager

The purpose of this article is to develop the method of estimation and research of measurement temperature uncertainty by the medical thermal imager in pathological zones depending on the distance between the patient and the thermal imager. The proposed method is based on the noise equivalent temperature difference (NETD) which depends on the linear objective magnification of the thermal imager.

Limiting Characteristics of Coherent Spectrum Analyzer

The influence of the component dimensions and parameters of a coherent optical spectrum analyzer on its performance was studied. One of the criteria for evaluating the performance of this instrument are the spatial resolution and the spatial bandwidth product. The purpose of this article is to study the dependence of the limiting characteristics on the changing of the component parameters of the coherent spectrum analyzer.

Metrological Analysis of Integrating Sphere Photometers for LED Luminous Flux Measurement

A comparative metrological analysis using mathematical models of three integrating sphere photometer schemes, for LED luminous flux measurement, was held. Each model takes into account the main design parameters of the photometer, typical values of which are used in the calculations.

Using of Thermal Imaging in the Study of the Temperature Distribution of Myocardial

Qualitative comparative analysis of thermal infarction was conducted using thermograph in the spectral range 8–14 microns. Quantitative assessment of myocardial temperature measurement accuracy is made depending on the ambient temperature. Based on the proposed approach to the analysis of thermal images infarction, researching area of temperature on the surface of the myocardium, which give a clear picture on the distribution of the internal temperature and the level of the microcirculation in the myocardium and vessels, were conducted.

Model of Plane Distribution of Heat Sources for Multi-Channel Matrix Oxygen Sensors

Transcutaneous polarography is one of the most objective noninvasive assessment of the capillary blood flow and microcirculation by controlling the oxygen partial pressure in the subcutaneous tissue. The outcome of research is influenced by such common factors as the oxygen content in the ambient air, the adequacy of the central hemodynamics of the patient, the presence of violations of the transport function of the blood, the pathology of the pulmonary system and local factors (disturbance of the local microcirculation, tissue edema, marked capillary spasm, etc.).

Improvement of Calculating Medical Thermovision Camera Minimum Resolvable Temperature Difference

The paper is devoted to improvement of the equation for calculating the minimum resolvable temperature difference (MRTD) of medical thermovision camera by means of more sophisticated models of thermal images visual perception. An MRTD calculating algorithm, which is based on a more reliable approximation of the visual system modulation transfer function by Schultz, is considered. We obtain new expression for the bandwidth of Schultz’s approximation, which does not depend on the angular size of the Foucault pattern bar. An improved equation for calculating the MRTD was obtained.

Silicon Photomultipliers as Alternative System of Photomultipliers of Neutral Particle Detector in Electron-Proton Accelerators

Measurement of events that produce particles, in particular photons, is a powerful tool for the study of subatomic constituents of the universe. The purpose of this research is to consider placement in the detector, study properties and implementation of updated ZEUS detector photomultipliers for possible use in future electron-proton accelerators. The most important part of the detector ZEUS, especially when measuring neutral particles such as photons, is calorimeter ZEUS, based on the phenomena of photon emission from the excited electron, which is returned to a lower energy level.

Techonlogy of Ultrasonic Control of the Well-Bonded Pipe Coupling Space Filling

The method of well-bonded pipe coupling space filling control by means of ultrasonic NDT methods has been proposed. Use of ultrasonic NDT method for coupling space filling with self-hardening substance (both compound and molten metal coupling space filling) has been analyzed. Taking into consideration the high temperature of the repair structure during repair works performance when using a molten metal, which is determined by high temperature, the application of piezo-electric transducers is ineffective.

Method for Assessing Modulation Transfer Function of Trifocal Intraocular Lens

The article investigates the quality of images formed by multifocal optical elements. The method for calculating of multifocal diffractive lens modulation transfer function (MTF) at presence of background is proposed. The method is based on a geometric calculation of the intensity of background images and the diffraction efficiency of the main image in each focal plane is considerated. The article has studied the contrast of main images formed by trifocal intraocular lens (IOL).

The Method for Evaluating Ametropia and the Depth of Focus of the Eye

The need is established for measuring pseudo-accommodation (the depth of focus of the eye) when a standard artificial or accommodative lens is implanted into the eye. It is specified the need for analyzing the impact of aberrations of a measuring device’s elements as well as the pupil’s diameter onto the accuracy of ametropia and pseudo-accommodation measurements by the method, proposed by the authors. In this study, a computer simulation is applied for an optical system of the measuring device and an ametropic eye with a diffuse-scattering retina.