MULTI-BAND AREA MONITOR SENSOR IN INFORMATION NETWORK FOR ELECTROMAGNETIC FIELDS MONITORING Miodrag MILUTINOV Nikola DJURIĆ Bogdan VUKOBRATOVIĆ University of Novi Sad, Faculty of Technical Sciences

2 / 12 Contents Introduction Design of information network Sensor’s Characteristics Probe’s characteristics Communication Conclusion Faculty of Technical Sciences, University of Novi Sad

3 / 12 Introduction 1/2 Rapid technological progress – EM environmental pollution. Public exposure – increased public concern about health effects, – continuous information of the public. Government of the Republic of Serbia – Monitoring projects Faculty of Technical Sciences, University of Novi Sad

4 / 12 Introduction 2/2 Monitoring EMF – Broadband, – Continuous, – Fully automated, – Wireless, – Remote control The proposed system is unique solution which is able to monitor all sources that emit EM field, over the territory covered by GSM network. Faculty of Technical Sciences, University of Novi Sad

5 / 12 Design of information network Parts of the system: –A–Autonomous sensors (spatially distributed) –C–Central Control Station (CCS) –C–Communication network (existing GSM mobile networks) –U–Users Technical personal Public user Faculty of Technical Sciences, University of Novi Sad

6 / 12 Sensor’s characteristics 1/3 The Sensor consist of:  Interchangeable probe,  Data logger with internal memory,  GSM modem and RS232 connector,  Power supply Internal rechargeable battery, Solar panel. The main advantage of the Sensor is its high level of autonomy due to: – Solar panel power supply, – Memory, – Remote control and data collection. Faculty of Technical Sciences, University of Novi Sad Parts of Sensor

7 / 12 Sensor’s characteristics 2/3 1.Broadband measuring of total electric or magnetic field – Electric field from 100kHz up to 7GHz – Magnetic field from 10Hz to 5kHz 2.Estimating average (AVG or RMS) or maximum (MAX) field level – Store field values continuously 24 hour per day 3.Communication – Remote (GSM) or – Local RS232 connector directly on the site Faculty of Technical Sciences, University of Novi Sad Functionality of Sensor

8 / 12 Sensor’s characteristics 3/3 Measuring at every 3 sec. Processing measured values – Average AVG or RMS values – Maximum MAX values Storing Faculty of Technical Sciences, University of Novi Sad Example of measuring and storing data Series of measured values every 3 sec (window of 6 min with 120 measured values). Processing and storing every 1 min over window of 6 min.

9 / 12 Probe characteristics – Electric field probe The quad-band probe with A/D circuits, – Wideband and three pass bands – Broadband measurements in all bands Frequency range Isotropic field probe The field probe characteristic Faculty of Technical Sciences, University of Novi Sad

10 / 12 Communication 1/2 GSM modem through GPRS-FTP: a)powering the modem on, b)connecting to FTP server running on CCS, c)downloading the settings files, if any d)uploading the measurement data e)terminating the connection and shutting the modem down Subsets of parameters for connections Faculty of Technical Sciences, University of Novi Sad ParameterDescription Access Point NameThe GPRS provider name User NameUser Name required for GPRS PasswordPassword required for GPRS CCS IP addressStatic IP address of FTP server CCS user nameUser name for accessing FTP server CCS passwordPassword for accessing FTP server

11 / 12 Communication 2/2 The files exchanged between sensor and FTP server: A.Settings files CFG – configuration file FLD – file containing user requests B.Measurement data and event files Record File – data collected in memory FLD File – data specifically requested by user Event File – events that happened since the last connection Faculty of Technical Sciences, University of Novi Sad Example of Recorded File

12 / 12 Conclusion The proposed project implements a modern and up-to-date technology. Automatically and continuously monitoring overall level of EM fields. Measurement of wide band and partial contribution of GSM and UMTS due to built-in band pass circuits. Spatially distributed and wireless connected sensors can cover large geographical areas. Online user access to measurement results. Faculty of Technical Sciences, University of Novi Sad A CKNOWLEDGEMENT This paper has been supported by Ministry of Sciences and Technological Development of the Republic of Serbia, through the grant for project of technological development TR

Nikola Đurić Faculty of Technical Sciences University of Novi Sad