In spite of a consensus of opinion over mankind no longer being able to do without the conveniences and benefits provided by radio, TV and cellular phones, the efficient functioning of all these systems require radio stations broadcasters - base transceiver stations related to the mobile telephony, and radio/TV station antennas - whose generated electromagnetic fields produce non-ionizing radiation. Nowadays, this topic is the object of diverse studies worldwide.
As a result of previously developed studies, the World Health Organization (WHO) defined a scale of radiation emission indices allowed in the surroundings of the stations - and came up with recommendations for respecting the limits imposed by those indices.
Owing to its broad experience in the area, CPqD has its own solution for non-ionizing radiation (NIR) supervision. Bearing unique features worldwide, this system is aimed at the continuous supervision of radio stations through the monitoring, via Internet, of the radiation levels in the antennas, which reassures the population about the safety of the environment.
Both CPqD and the public telecommunication-regulating department perform this work. It comprises a technical information survey (on the location of the stations, the height of the antennas in the tower, the model of antennas, the transmission power) and a survey on the street alignment digital map related to the region which is being monitored.
This information, in a format that is compatible with the CPqD solution for NIR Supervision, is loaded in the system database, which is situated in the premises of CPqD, in the City of Campinas, Brazil.
After data collection is done, a second working stage includes a theoretical simulation of electromagnetic emissions starting from the radio stations. This determines the points which hold the most intense electromagnetic fields. These points are the places which receive the indication for the installation of continuous supervision remote sensors. The amount of sensors is defined according to the number of points detected within the monitored region. Simulation results may be identified by the system in the map of the region or be consulted through the search for a specific address or station.
Through mobile telephony, the remote sensors transmit the collected data to the system at CPqD, and this information is stored in this system database. These results are available for public inspection. The population belonging to the monitored area can also access the results via Internet.
The CPqD solution for NIR Supervision is currently being deployed in the City of Americana, in the State of São Paulo.