Персона: Губский, Константин Леонидович
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СИСТЕМА ЛАЗЕРНОЙ ОЧИСТКИ ПОВЕРХНОСТИ ЗЕРКАЛ ОПТИЧЕСКИХ ДИАГНОСТИК НА ИТЭР
The development of cleaning optics and deposition-mitigating techniques is a key factor in the construction and operation of optical diagnostics in ITER. It has been shown that high initial reflection characteristics of optical elements can be recovered by choosing regimes of fiber laser radiation effect on the deposited surface. Experiments on transport of fiber laser radiation to the metal mirror by using system of lens and cleaning showed the possibility of a hardware implementation of methods applicable in the geometry of port-plug ITER.
Accuracy of the interferometric method for Leeb hardness testers calibration
© 2021 Author(s).In this article, we propose a method for improving accuracy in calibrating Leeb hardness testers using fiber interferometric systems. The calibration system is implemented using the photonic Doppler velocimetry technique. This paper provides estimates of the measurement uncertainty arising in the calibration system and describes a method for improving accuracy, which takes into account the signal-to-noise ratio, sampling rate, and processing parameters.
Use of Direct Optical Heterodyning for Measuring Hardness by the Leeb Method
© 2019, Pleiades Publishing, Ltd.Abstract: In this paper, we describe a portable system for measuring the indenter velocity in hardness meters implemented according to the Leeb method. The developed system is a fiber interferometer, in which a radiation source is a semiconductor laser with a wavelength of 1550 nm. The presented experimental results confirm the ability of the system to measure indenter velocities with an uncertainty of 0.001 m/s, which satisfies the requirements of the standards for this method of measuring hardness.
МАЛОШУМЯЩИЙ МОБИЛЬНЫЙ СВЧ-ДОЗИМЕТР
Полезная модель относится к области обеспечения электромагнитной безопасности и может быть использована для непрерывного контроля получаемой дозы СВЧ-энергии на рабочих местах и в быту. Технический результат заявляемой полезной модели направлен на устранение шумов, связанных с наложением GSM-сигналов на принимаемые (дозиметрические) сигналы СВЧ. Устройство включает первый и второй материал, имитирующие биоткань, четыре идентичные измерительные детекторы, измеряющие мощность СВЧ электромагнитного излучения, устройство обработки данных и управления, соединенное электрическими цепями с каждым из измерительных детекторов, корпус из прозрачного для СВЧ ЭМИ, приемник сигналов системы глобального позиционирования GPS и приемник сигналов мобильной сотовой связи GSM, первый и второй контроллер, генератор тактовых сигналов и устройство памяти. В результате введения в систему синхронизатора уровень шумов в системе уменьшается, поскольку поочередное включение передачи данных по GSM-каналу и детекторов СВЧ-излучения позволяет предотвратить наложение одних сигналов на другие.
КОАКСИАЛЬНЫЙ ИМПУЛЬСНЫЙ ПЛАЗМЕННЫЙ РАКЕТНЫЙ ДВИГАТЕЛЬ С МАГНИТНОЙ КАТУШКОЙ
Полезная модель относится к электрическим ракетным двигателям, а именно к импульсным плазменным ракетным двигателям, применяемым на космических аппаратах. Техническим результатом является снижение массы и габаритов двигателя, а также повышение эффективности использования рабочего тела. Это достигается за счет использования толстостенной диэлектрической трубки, на торцах которой находятся электроды, подключенные к конденсаторной батарее. На одном из электродов - катоде - размещается свеча зажигания, служащая для инициации разряда между электродами двигателя по внутренней поверхности диэлектрической трубы. Второй электрод - анод -выполнен таким образом, чтобы сквозь него из канала диэлектрической трубы наружу двигателя могла выходить плазма. Кроме того, двигатель включает в себя магнитную катушку, намотанную поверх диэлектрической трубы и последовательно с электродами подключенную к конденсаторной батарее. В результате введение катушки позволяет снизить массу и габариты двигателя и увеличить продолжительность электрического разряда, позволяя более полно использовать рабочее тело.
Impactor velocity measurement system for dynamic hardness testers and calibration machines on Leeb scales
© 2020 Elsevier LtdThe article aims to solve the problem of measuring the impactor velocity for dynamic hardness testers according to the Leeb, as one of the key parameters to ensure the accuracy and reliability of hardness measurements by this method. The gravitational method of impactor acceleration, used in calibration machines, and spring acceleration, typical for hardness testers, have been studied. Various technical solutions for velocity calibration are analyzed. Accurate, easy to implement, compact and inexpensive device based on fiber optic and allows monitoring the dynamics of the object without the use of additional reflective elements is developed. This system suitable for calibration or verification of dynamic hardness testers and calibration machines. The system is based on a laser interferometer in which the direct optical heterodyning of Doppler signals (Photonic Doppler Velocimetry) is applied. The maximum permissible error of the system is determined by the requirements for the metrological characteristics of the Leeb hardness calibration machine and is 0.0025 m/s at a speed of ~2 m/s. The possibility to measure the impact body velocity with an error of 0.2·10-3 m/s is confirmed.
A Three-Phase PDV Signal-Processing Method that Eliminates the Influence of Acceleration on Determining Velocity
© 2022, Pleiades Publishing, Ltd.Abstract: The interference method for determining the velocity of objects using direct optical heterodyning (photonic Doppler velocimetry) has become widespread due to the ease of setting up the fiber-optic system, the unambiguous results that it produces, and the wide possibilities for varying the measurement accuracy and temporal resolution. The accuracy of velocity measurements can be fractions of a percent, but there are a number of factors that interfere with this. For example, a change in the velocity of an object, that is, its movement with acceleration, leads to a broadening of the signal spectrum with an increase in the working time window and, as a result, to a decrease, rather than an increase, in the accuracy of measuring the velocity. In this letter, a method is proposed that allows one to compensate for the effect of acceleration on the accuracy of velocity measurement. The proposed model for processing the registered signals makes it possible to determine both the acceleration and the velocity of the object. The applied algorithm made it possible to avoid the expansion of the spectrum with an increase in the time window and to improve the accuracy of measuring the velocity of a freely falling body by an order of magnitude.
3D push–pull heterodyne interferometer for SPM metrology
© 2019 Optical Society of America.A three-coordinate heterodyne laser interferometer has been developed to measure the displacement of the probe microscope scanner with a subnanometer resolution that provides traceability of measurements to the standard of meter through the wavelength of a stabilized He–Ne laser. Main sources of errors are investigated, and their influence is minimized so that the resulting measurement uncertainty of the system does not exceed 0.2 nm, and the resolution is 0.01 nm. The investigation of metrological characteristics of the three-coordinate interferometer was carried out with a scanning probe microscopy (SPM) NanoScan-3D using TGZ-type calibration gratings. The values measured with SPM fell within the 95% confidence interval given by Physikalisch-Technische Bundesanstalt (PTB) (Germany). SPM equipped with a laser interferometer was used to measure the characteristics of dynamic etalons of geometric dimensions.
Inferring possible magnetic field strength of accreting inflows in EXor-type objects from scaled laboratory experiments
© K. Burdonov et al. 2021.Aims. EXor-type objects are protostars that display powerful UV-optical outbursts caused by intermittent and powerful events of magnetospheric accretion. These objects are not yet well investigated and are quite difficult to characterize. Several parameters, such as plasma stream velocities, characteristic densities, and temperatures, can be retrieved from present observations. As of yet, however, there is no information about the magnetic field values and the exact underlying accretion scenario is also under discussion. Methods. We use laboratory plasmas, created by a high power laser impacting a solid target or by a plasma gun injector, and make these plasmas propagate perpendicularly to a strong external magnetic field. The propagating plasmas are found to be well scaled to the presently inferred parameters of EXor-type accretion event, thus allowing us to study the behaviour of such episodic accretion processes in scaled conditions. Results. We propose a scenario of additional matter accretion in the equatorial plane, which claims to explain the increased accretion rates of the EXor objects, supported by the experimental demonstration of effective plasma propagation across the magnetic field. In particular, our laboratory investigation allows us to determine that the field strength in the accretion stream of EXor objects, in a position intermediate between the truncation radius and the stellar surface, should be of the order of 100 G. This, in turn, suggests a field strength of a few kilogausses on the stellar surface, which is similar to values inferred from observations of classical T Tauri stars.