scholarly journals Development of a method for quantitative comparison of the luminance of self-glowing crystals – the basic elements of a low current source

2021 ◽  
Vol 2103 (1) ◽  
pp. 012159
Author(s):  
M K Mjagkih ◽  
P A Dementev ◽  
M V Zamoryanskaya
Keyword(s):  
Service Life ◽  
Radioactive Isotope ◽  
Optical Radiation ◽  
Radiation Power ◽  
Current Source ◽  
Quantitative Comparison ◽  
Luminescence Spectra ◽  
Spectral Functions ◽  
Crystal Matrix ◽  
Radioactive Radiation

Abstract This work is devoted to the development of a method for the quantitative comparison of the luminosity of weakly luminous samples, such as self-glowing crystals. A self-glowing crystal is an efficient scintillator, whose self-luminescence is due to the decay of a radioactive isotope introduced into the crystal matrix during its growth. Such crystals can be used as low current sources with a service life of 50 years or more. This technique takes into account the luminescence spectra of the samples under study, the spectral functions of the spectrometer and photodetector. Information on the luminescence spectra of samples can be obtained based on their cathodoluminescence spectra. Thanks to the calculations performed according to this technique, it becomes possible to estimate the optical radiation power of a self-glowing crystal, which can be converted into an electric current using a photodiode. Also, the proposed technique can be applied to assess the luminosities of any materials under the influence of radioactive radiation.

Limitation of optical radiation power by organic molecules: II. Porphyrins and phthalocyanines

2004 ◽  
Vol 34 (2) ◽  
pp. 139-146 ◽  
Author(s):  
Rimma T Kuznetsova ◽  
T N Kopylova ◽  
G V Mayer ◽  
L G Samsonova ◽  
Valerii A Svetlichnyi ◽  
...  
Keyword(s):  
Optical Radiation ◽  
Organic Molecules ◽  
Radiation Power

Wide-range calibration of optical radiation power meters

2019 ◽  
Vol 86 (12) ◽  
pp. 758
Author(s):  
E. V. Kuvaldin ◽  
A. A. Shulga
Keyword(s):  
Optical Radiation ◽  
Radiation Power ◽  
Wide Range

scholarly journals Research of multisensor characteristics based on optical fiber

Doklady BGUIR ◽  
2021 ◽  
Vol 19 (1) ◽  
pp. 70-78
Author(s):  
A. O. Zenevich ◽  
S. V. Zhdanovich ◽  
H. V. Vasilevski ◽  
A. A. Lagutik ◽  
T. G. Kovalenko ◽  
...  
Keyword(s):  
Optical Fiber ◽  
Minimum Distance ◽  
Optical Radiation ◽  
Radiation Power ◽  
Optical Loss ◽  
Single Mode ◽  
Optical Reflectometry ◽  
Optimal Values ◽  
The Impact ◽  
To Receive

The research results of multisensors based on optical fiber, the principle of which is to change the conditions of propagation of optical radiation in the optical fiber in the places where macro-bends are formed at the points of impact, are presented in the paper. The formation of macro-bends leads to an additional attenuation of the power of optical radiation propagating through the optical fiber. A single-mode optical fiber was used with the parameters, which are supported by numerous manufacturers and comply with the recommendations of ITU-T G.655. The measurements were carried out for four wavelengths of optical radiation (1310, 1490, 1550, 1625 nm), corresponding to the transparency windows of the optical loss spectrum of the optical fiber. Using optical reflectometry methods, it was determined that the amount of attenuation of optical radiation of each macro-bend formed at the point of action of the multisensor does not depend on the number of simultaneously formed macro-bends and also does not depend on the location of the point of action along the length of the multisensor. The dependences of the attenuation of the optical radiation power introduced by the macro-bends of the optical fiber on the radius, length, or angle of the macro-bends formed at the multisensory impact points are determined experimentally. The obtained dependences also allow one to determine the optimal parameters of the formed macro-bends of the multisensor to obtain the maximum range of attenuation change for each value of the wavelength. The values of the minimum distance between the impact points, the maximum number of impact points and the optimal values of the radius and angle of the optical fiber macro-bend at the impact points are determined. The results obtained provide opportunities to continue the development of multisensors that allow us to receive information about parameters from several impact points, that are located on a single optical fiber, simultaneously.

Optical-radiation power limiting in high-scattering media

2004 ◽  
Vol 49 (9) ◽  
pp. 512-515
Author(s):  
S. A. Tereshchenko ◽  
V. M. Podgaetskii
Keyword(s):  
Optical Radiation ◽  
Radiation Power ◽  
Scattering Media

A super optical radiation power meter

1985 ◽  
Vol 53 (11) ◽  
pp. 1108-1110 ◽  
Author(s):  
L. E. Larson ◽  
M. E. Mickelson
Keyword(s):  
Optical Radiation ◽  
Radiation Power ◽  
Power Meter

Evaluation of the Power-Generation Capacity of Implantable Thermoelectric Power Generator Driven by Radioisotope Fuel

2011 ◽  
Author(s):  
Yang Yang ◽  
Jing Liu
Keyword(s):  
Power Generation ◽  
Service Life ◽  
Thermoelectric Power ◽  
Thermal Energy ◽  
Temperature Difference ◽  
Radioactive Isotope ◽  
Thermoelectric Generator ◽  
Power Generator ◽  
Thermoelectric Power Generator ◽  
Generation Capacity

The unique merit of the implantable thermoelectric generator lies in its direct utilization of the temperature difference intrinsically existing throughout the whole biological body. Therefore, it can resolve the service life mismatch between the IMD and its battery. In order to promoting the TEG maximum power, a piece of radioisotope fuel was fixed on the TEG hot junction. Recurring to the thermal energy released during disintegration of radioactive isotope, it can guarantee a marked promotion in the temperature difference across the implanted TEG; consequently apply enough power for the IMDs.

scholarly journals Наблюдение когерентных осцилляций населенности NV-центров в алмазе в микроволновом диапазоне

2021 ◽  
Vol 129 (3) ◽  
pp. 301
Author(s):  
Р.А. Ахмеджанов ◽  
Л.А. Гущин ◽  
И.В. Зеленский ◽  
В.А. Низов ◽  
Н.А. Низов ◽  
...  
Keyword(s):  
Magnetic Resonance ◽  
Microwave Radiation ◽  
Ground State ◽  
Room Temperature ◽  
Optical Radiation ◽  
Radiation Power ◽  
Experimental Results ◽  
State Transitions ◽  
Feature Parameters ◽  
Optically Detected

We demonstrate experimental results showing narrow features in room temperature optically detected magnetic resonance spectra that appear when the ground state transitions are driven by bichromatic or amplitude modulated microwave radiation. We study the dependence of the feature parameters on the intensity of optical radiation and microwave radiation power.

scholarly journals Development of Metrological Maintenance of Photometric Devices For Pulsometry

2019 ◽  
pp. 10-16
Author(s):  
V. Degtjaruk ◽  
М. Khоdаkоvskyi ◽  
М. Budnyk ◽  
V. Budnyk ◽  
М. Мudrenko ◽  
...  
Keyword(s):  
Output Signal ◽  
Optical Radiation ◽  
Test Bench ◽  
Radiation Power ◽  
Absolute Error ◽  
The Body ◽  
Power Meter ◽  
Calibration Table ◽  
Light Filters ◽  
Calibration Dependence

Investigating pulse in different parts of the body is of great interest to doctors. The purpose is the development of metrological maintenance, calibration and certification of photometric instruments [1—3]. Photoplethysmograph is designed to record changes in optical density of a person’s body area with a beam of light reflected in the light [4—6]. Measurements are carried out non-invasively [7]. Such device registers pulse wave (PW) signals and reference ECG with computer processing, Fig. 1—2 [8—10]. A working measure (LED) was created and calibrated using an optical radiation power meter based on the substitution method [11], test bench is at Fig. 3, calibration results — in Table 1 and Fig. 4. Test bench for device calibration and an optical radiator are at Fig. 5—6, view of calibrated signal — at Fig. 7. As a result of calibration (Table 2) the dependence of the output signal on LED power supply (Fig. 8) is obtained, and the calibration dependence is shown at Fig. 9. In the test bench for SMC used standardized light filters KNS-01 at a wavelength of 630 nm (Fig. 10a). The calibration curve is calculated as the dependence of the relative coefficient of inverse light dispersion (RCILD) on PW (Fig. 10b, Table 3). The view of output signal is at Fig. 11. As a result of SMC, the limits of permissible absolute error of 2 % in the range of RCILD (15—100) % are defined.

scholarly journals Трехмерная люминесцентная томографическая визуализация биотканей-=SUP=-*-=/SUP=-

2019 ◽  
Vol 126 (1) ◽  
pp. 87
Author(s):  
В.В. Рочева ◽  
А.Г. Савельев ◽  
А.В. Нечаев ◽  
А.Н. Генералова ◽  
В.А. Семчишен ◽  
...  
Keyword(s):  
Rare Earth ◽  
Rare Earth Elements ◽  
Biological Tissue ◽  
Living Organism ◽  
Luminescence Spectra ◽  
Tomographic Image ◽  
Crystal Matrix ◽  
Luminescent Nanoparticles ◽  
Narrow Bands ◽  
Ir Light

AbstractWe propose a method for obtaining a fluorescence tomographic image for visualization and diagnosis of tissues of a living organism. The method is based on the excitation of the luminescence of multicolor upconverting nanoparticles localized in the depth of the biological tissue or a phantom imitating it by IR light. By recording the changes in the shape of the spectrum of the intensity of luminescence radiation from luminescent nanoparticles on the surface of the tissue, it is possible to obtain information about the depth of their occurrence. To implement this approach, upconverting nanoparticles were synthesized on the base of β-NaYF_4 crystal matrix doped with rare-earth elements Yb^3+, Er^3+, and Tm^3+. The luminescence spectra of the produced nanoparticles upon excitation at a wavelength of 980 nm contain three narrow bands with maxima at wavelengths 540, 655, and 800 nm.

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