Measurement of exposure to radio-frequency electromagnetic fields. Field strength in the frequency range 100 kHz to 1 GHz

1998 ◽  
Keyword(s):  
Field Strength ◽  
Radio Frequency ◽  
Electromagnetic Fields ◽  
Frequency Range

scholarly journals COMPACT FLUORESCENT LAMPS AS SOURCES OF ELECTROMAGNETIC FIELDS OF RADIO- FREQUENCY RANGE (EXPERIMENTAL STUDY)

2019 ◽  
pp. 59-62
Author(s):  
V.N. Nikitina ◽  
G.G. Lyashko ◽  
N.I. Kalinina ◽  
E.N. Pankina
Keyword(s):  
Experimental Study ◽  
Radio Frequency ◽  
Electromagnetic Fields ◽  
Electric Fields ◽  
Experimental Studies ◽  
Frequency Range ◽  
Electronic Ballast ◽  
Fluorescent Lamps ◽  
Compact Fluorescent Lamps ◽  
Surrounding Space

The objects of this study are compact fluorescent lamps with an electronic ballast and the hygienic assessment of electromagnetic fields created by compact fluorescent lamps. As part of the work, the selection of samples of compact fluorescent lamps for the experimental study of electromagnetic fields was carried out. The background levels of electric and magnetic fields with a frequency of 50 Hz and high-frequency range were measured. Experimental studies of the spectrum and intensity of electromagnetic fields created by compact fluorescent lamps were carried out with different variants of lamp placement (in a cartridge without a light armature, in a local lighting fixture, in general lighting fixtures – chandeliers). The study showed that compact fluorescent lamps equipped with electronic ballast create electromagnetic fields of radio frequency range in the surrounding space. The main frequency of radiation in the examined lamp samples ranged from 32 to 58 kHz. The intensity of electric fields created by compact fluorescent lamps may exceed the permissible level set for consumer goods.

METHOD OF SYNTHESIS OF MATHEMATICAL MODELS FOR DISEASES PREDICTING AND DIAGNOSING CAUSED BY ELECTROMAGNETIC FIELDS OF THE RADIO FREQUENCY RANGE

2020 ◽  
pp. 122-128
Author(s):  
Николай Алексеевич Кореневский ◽  
Анна Владимировна Титова
Keyword(s):  
Radio Frequency ◽  
Electromagnetic Fields ◽  
Human Body ◽  
Energy State ◽  
Synthesis Method ◽  
Biologically Active ◽  
Similar Data ◽  
Frequency Range ◽  
Low Intensity ◽  
The Impact

В работе рассматривается метод синтеза математических моделей прогнозирования и диагностики заболеваний, провоцируемых воздействием электромагнитных полей радиочастотного диапазона, позволяющий контролировать текущее состояние человека с целью дальнейшего принятия решений о возможной коррекции функций организма в случае необходимости. С учетом неполного и нечеткого описания исследуемого класса заболеваний в качестве базового математического аппарата выбраны технология мягких вычислений и, в частности, методология синтеза гибридных нечетких решающих правил, хорошо зарекомендовавшая себя при решении задач с аналогичной структурой данных и типом неопределенности. Предлагаемый метод синтеза позволяет учитывать мультипликативный эффект воздействия на организм человека электромагнитных полей (ЭМП) различной модальности и интенсивности с учетом других эндогенных и экзогенных факторов риска. С учетом того, что для достаточно мощных ЭМП радиочастного диапазона определены предельно допустимые уровни с известными последствиями, а для низкоинтенсивных ЭМП указаны лишь тенденции возможных заболеваний в основном на качественном уровне, предлагаются две различные ветви синтеза соответствующих решающих правил. Для мощных и стабильных ЭМП предлагается использовать модификацию известных моделей, полученных для промышленных энергосетей. Для оценки влияния низкоинтенсивных, нестабильных ЭМП радиочастотного диапазона на организм человека предлагается использовать нечеткие табличные модели и ряд чувствительных к действию ЭМП радиочастотного диапазона индикаторов. К таким индикаторам относятся состояние внимания, памяти, мышления, а также динамика изменения энергетического состояния биологически активных точек (БАТ), связанных с исследуемой патологией, и общесистемных БАТ Taking into account the incomplete and fuzzy description of the studied class of diseases, the basic mathematical apparatus was chosen as a soft computing technology, and, in particular, the methodology for the synthesis of hybrid fuzzy solving rules, which has proven itself well in solving problems with a similar data structure and type of uncertainty. The proposed synthesis method allows us to take into account the multiplicative effect of electromagnetic fields (EMF) of different modality and intensity on the human body, taking into account other endogenous and exogenous risk factors. Taking into account that the maximum permissible levels with known consequences are defined for sufficiently powerful EMF of the radio frequency range, and only trends of possible diseases are indicated for low-intensity EMF, two different branches of synthesis of the corresponding decisive rules are proposed at the qualitative level. For powerful and stable EMF, it is proposed to use a modification of known models obtained for industrial power grids. To assess the impact of low-intensity, unstable RF EMF on the human body, it is proposed to use fuzzy tabular models and a number of indicators sensitive to the action of RF EMF. These indicators include the state of attention, memory, thinking, as well as the dynamics of changes in the energy state of biologically active points (BAP) associated with the studied pathology and system-wide BAP

scholarly journals Characteristics, calibration and measurement uncertainty of RF field strength meters in the frequency range up to 18 GHz

2007 ◽  
Vol 5 ◽  
pp. 435-438 ◽  
Author(s):  
R. Pape ◽  
K. Münter ◽  
T. Schrader
Keyword(s):  
Field Strength ◽  
Measurement Uncertainty ◽  
Electromagnetic Fields ◽  
Measurement Data ◽  
Uncertainty Budget ◽  
Field Structure ◽  
Frequency Range ◽  
Field Representation ◽  
Radiation Monitors

Abstract. Due to their construction, the devices used for the measurement of electromagnetic fields (radiation monitors) must be calibrated individually. The measurement data obtained are documented in a calibration certificate and the user must take them into account in the uncertainty budget he has to draw up. In addition to the uncertainty contributions of the field representation and of the transfer, other contributions occur which depend on the special constructive features of these devices. When the uncertainty budget is drawn up, it depends on the application and the information about the field structure which contributions will have an effect and which will not. The procedure will be explained by an example.

Normative and methodological support of control of electromagnetic fields at the ships

2021 ◽  
Vol 61 (6) ◽  
pp. 402-407
Author(s):  
Valentina N. Nikitina ◽  
Galina G. Lyashko ◽  
Nina I. Kalinina ◽  
Ekaterina N. Dubrovskaya ◽  
Alexander M. Vishnevskiy ◽  
...  
Keyword(s):  
Magnetic Fields ◽  
Power Systems ◽  
Radio Frequency ◽  
Electric Power ◽  
Electromagnetic Fields ◽  
Electric Power Systems ◽  
Wide Frequency Range ◽  
Design Stage ◽  
Frequency Range ◽  
Electric And Magnetic Fields

The seafarers carried out the professional activity in a complex electromagnetic environment (EME), with technical means, structural materials, depending on the purpose of the watercraft, architectural features, and vessel classification. There are static electric fields, permanent magnetic and low-frequency electric and magnetic fields on ships. Marine radio-electronic means (REM) creates Electromagnetic fields (EMF) of the radio frequency range that provide communication, the safety of navigation and operation, and solving navigation problems. According to the documents of the sanitary legislation, specialists carry out control of the maximum permissible EMF levels for watercraft and marine structures at the design stage of the vessel by calculating the intensity of electromagnetic fields during commissioning, instrumental control of EMF levels. There are new technical means in modern automated vessels of various types and purposes that create electromagnetic fields in the crew's stay zones, which makes it urgent to improve regulatory and methodological documents in the area of ensuring the electromagnetic safety of the team and passengers. The study aims to develop proposals for regulatory, methodological, and hardware control over compliance with the maximum permissible levels of electromagnetic fields on ships to ensure the electromagnetic safety of the crew. Generalization of materials of own research of EME on ships, systematization of sources of electromagnetic fields. Analysis of regulations in occupational safety and health for the protection of the crew from the effects of EME, methodological documents on the calculation forecasting, and instrumental determination of the levels of electromagnetic fields. Experts have revealed that there are electromagnetic fields of a wide frequency range in the premises of ships and on open decks. The study showed that electromagnetic fields of a wide frequency range are created in the premises of ships and on open decks. Indoors, the most significant is the impact on the crew of electric and magnetic fields with a frequency of 50 Hz created by the ship's electric power systems. In addition, on open decks (at workplaces and in crew recreation areas), the protection of the crew from EMF antennas of the radio frequency range is relevant. Therefore, it is necessary to develop methods for calculating the prediction of EMF levels and improve the means of measuring electromagnetic fields on ships. The most common sources of EMF in the crew's stay areas are radio communication and radar facilities, ship's electric power systems. The task of developing a methodological document on the calculated prediction of EMF levels in rooms and on open decks at the design stage of ships is urgent. In addition, it is necessary to develop devices-meters of electromagnetic fields for instrumental monitoring of EMF levels in actual operating conditions of the vessel.

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