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- Measurement Techniquesel febrero 5, 2024 a las 12:00 am
- Vacuum large-aperture black body model in the temperature range of 223.15–423.15 K for radiometric calibration of optoelectronic equipment for earth observationsel noviembre 1, 2023 a las 12:00 am
Abstract The article presents the structure of systems for radiometric calibration for the Earth remote sensing optoelectronic equipment in the infrared spectrum range. Analysis of existing facilities for radiometric calibration of the Earth remote sensing optoelectronic equipment in conditions of vacuum and low-background radiation was carried out. These facilities are based on using the black body models as radiation sources, including reference sources based on the phase transition of pure metals, for example gallium or indium. A large-aperture black body model LABB-380 with an aperture diameter of 380 mm in the temperature range of 223.15–423.15 K has been developed. LABB-380 is part of a high-vacuum low-background test rig currently being developed at the Scientific Research Institute of Optoelectronic Instrumentation for the radiometric calibration of the Earth remote sensing optoelectronic equipment. The results of calculating the normal effective emissivity of the LABB-380 surface in the above temperature range and the spectral range of 3–20 μm are presented. The metrological characteristics of LABB-380 obtained during the transmission of a temperature unit from the State Working Standard of the zero category of a temperature unit in the range from 0 to 3000 °C (Registration No. 3.1.ZZA.0020.2015) using a comparator based on the HETRONIXS precision pyrometer have been studied. According to the calibration results in the temperature range of 300.15–390.15 K, the instability of the LABB-380 radiation was 0.005 K, the extended temperature uncertainty was 0.66 K at the temperature of 300.15 K and 0.88 K at 390.15 K.
- GET 110-2023 State Primary Standard for the units of complex permittivity within the frequency range of 0.1–178.4 GHzel noviembre 1, 2023 a las 12:00 am
Abstract The article presents a study into the measurement of dielectric parameters of materials. The study aims to examine promising high-precision methods for measuring the complex permittivity of low-loss materials within the decimeter wavelength range and a non-resonant method for measuring the dielectric parameters of materials characterized by increased dielectric losses. For measuring the complex permittivity of low-loss materials within the decimeter wavelength range, a resonance method of measurement in a coaxial resonator with an adjustable capacitive gap and a method of measurement in a dielectric-filled H011 cavity resonator were developed. In order to measure increased dielectric losses of 10−2–10−1, a transmission line technique was developed using a non-resonant measuring transducer on the basis of a shielded dielectric waveguide, the specimen to be analyzed. The developed methods are applied in GET 110-2023 State Primary Standard for the units of complex permittivity within the frequency range of 0.1–178.4 GHz. The frequency range of the standard is 0.1–178.4 GHz; the reproduction range of relative permittivity is 1.2–500; and the reproduction range of dielectric loss tangent is 10−8–10−1. GET 110-2023 can be used to provide metrological support for dielectric control in the production of radio frequency cables, telecommunication equipment, electronic components, etc.
- Areas for improvement of measuring systems and their metrological supportel noviembre 1, 2023 a las 12:00 am
Abstract The relevant problem of analyzing the features of measurement systems and their metrological support is formulated. Promising areas for the development of measurement systems, including virtual systems, are considered. The article analyzes such development areas as remote and synchronized vector measurements, cloud technologies, the Internet of Things, big data, and artificial intelligence. Several innovative solutions employing both biosensors and hybrid metrology are described (introduction of structural redundancy into measurement systems, as well as the introduction of temporal and algorithmic redundancies into the software of measurement systems). It is shown that the integration of component functions objectively complicates the identification of measurement systems in complex technical systems, yet providing new possibilities for technical systems with measurement functions. The following areas for improving the metrological support of measurement systems are analyzed: self-diagnostics and self-monitoring; remote and automated calibration and verification; use of digital twins, big data, and artificial intelligence; establishment of adaptive calibration and verification intervals. The study reveals the need to minimize bureaucratic procedures and automate metrological procedures while showing practicability in switching from periodic to adaptive procedures requiring no human involvement.
- A fast algorithm for decoding an object image in structured light for measuring a three-dimensional profile in a nonlinear optical pathel noviembre 1, 2023 a las 12:00 am
Abstract The study uses phase triangulation methods to examine the development of image processing algorithms for measuring a three-dimensional (3D) surface profile. An algorithm is proposed for decoding images of an object in structured light based on an iterative search for the minimum deviation of the model function using measurement results and compensating for the nonlinearity of the transceiver path of the measuring complex. A distinctive feature of the proposed method is that the search for the model function is desired in the form of a second-degree polynomial, ensuring the stability of the method against nonlinear distortions caused by power-law transformations of the transceiver path. The interval search method is used to reduce algorithmic complexity qualitatively. The proposed algorithm provides a stable search for the value of the initial phase shift in object images, is resistant to noise and nonlinear distortions, and allows image processing in 3D scanning systems based on triangulation methods using structured illumination and phase triangulation. Thus, the algorithm will be useful for data processing during the operation of measuring systems with a nonlinear transceiver path and measurement time constraints.