Banca de DEFESA: JÚLIA DA LUZ ANDRADE SILVA

Uma banca de DEFESA de MESTRADO foi cadastrada pelo programa.
STUDENT : JÚLIA DA LUZ ANDRADE SILVA
DATE: 14/08/2023
TIME: 09:00
LOCAL: https://meet.google.com/kmy-jhar-qwi
TITLE:

Measurement and Evaluation of Exposure to Non-Ionizing Radiation in Indoor Environments

KEY WORDS:

Non-Ionizing Radiation; NIR; Electric Field; Indoor Measurements; Shopping mall measurements; measurements in homes.

PAGES: 70
BIG AREA: Engenharias
AREA: Engenharia Elétrica
SUBÁREA: Telecomunicações
SPECIALTY: Sistemas de Telecomunicações
SUMMARY:

It is essential to monitor the levels of Non-Ionizing Radiation (NIR) that the general population may be exposed to and compare them with the limits defined in current regulations, bearing in mind the rapid rise of telecommunication services and the perspectives of an extremely connected. Indoor environments (\textit{indoor}), such as residences and shopping malls, are places that meet the interests of measurements, mainly due to the presence of different NIR sources and the location of these sources about end users. This work presents NIR measurements in a \textit{shopping center} and residences in Natal, RN, Brazil. At shopping, a set of six measurement points was proposed, following two criteria: places with a large flow of people and the presence of one or more Distributed Antenna System (DAS), co-located or not with Wi-Fi access points. The results are presented and discussed in terms of distance from the DAS (conditions: near and far) and flow density of people in the mall (scenarios: low and high number of people). The highest mean and highest peak electric fields measured were 1.96 and 3.26~V/m, corresponding respectively to 5\% and 8\% of the limits defined by the International Commission on Non-Ionizing Radiation Protection (ICNIRP) and Agency National Telecommunications Agency (ANATEL). In the homes, measurements were taken at 40 Wi-Fi access points where the highest exposure level was 4.66 V/m (7.64\% of the limit), verified for the network load on the network of 2.4 GHz (Situation 1), at a value of 4.66 V/m (7.64\% of the limit). The results are discussed regarding the measurement situation, brand and time of use of the equipment. Measurements were also carried out in 51 microwave ovens. Only one exceeded 50~W/m² (limit determined in current regulations), caused by rust that compromised the door's structure. Thus, two types of repairs were carried out: the use of epoxy putty to fill the opening in the door (Repair 1) and the replacement of the outer surface of the oven (Repair 2). Only Repair 1 solved the leakage problem with an average of 0.1841 W/m² and a peak of 0.4222 W/m². As for the other 50 microwave ovens, the relation between power density and factors such as worst point, brand, time of use and state of conservation of the device were analyzed.

COMMITTEE MEMBERS:
Interno - 2524053 - ANTONIO LUIZ PEREIRA DE SIQUEIRA CAMPOS
Externo à Instituição - HUMBERTO DIONISIO DE ANDRADE - UFERSA
Presidente - 1412682 - VICENTE ANGELO DE SOUSA JUNIOR