Technical Committee106 Methods for the assessment of electric, magnetic and electromagnetic fields associated with human exposure

Transcription

1 Technical Committee106 Methods for the assessment of electric, magnetic and electromagnetic fields associated with human exposure International Electrotechnical Commission Michel Bourdages Secretary International Electrotechnical Commission Technical Committee 106 1

2 Summary Scope of Technical Committee (TC) 106 The role of TC 106 in the assessment of compliance with exposure limits Standards published since the last IAC meeting Standards in progress International Electrotechnical Commission Technical Committee 106 2

3 Scope of the IEC Technical Committee 106 TC 106 «Methods for the assessment of electric, magnetic and electromagnetic fields associated with human exposure» has been established at the end of TC 106 develops international standards on : - Characterization of the electromagnetic environments with regard to human exposure - EMF measurement methods; instrumentation and procedures - Calculation methods International Electrotechnical Commission Technical Committee 106 3

4 Scope of the IEC Technical Committee 106 It covers the whole frequency range from 0 Hz to 300 GHz. It applies to basic restrictions and reference levels (exposure limits). Excluded are: The establishment of exposure limits Mitigation methods International Electrotechnical Commission Technical Committee 106 4

5 The role of TC 106 in the assessment of compliance with exposure limits The ICNIRP 1998 Guidelines indicates that: the reference levels are obtained from the basic restrictions by mathematical modelling. They are given for the condition of maximum coupling of the field to the exposed individual. If the measured or calculated value exceeds the reference level, it does not necessarily follow that the basic restriction will be exceeded. However, whenever a reference level is exceeded it is necessary to test compliance with the relevant basic restriction International Electrotechnical Commission Technical Committee 106 5

6 Standard : Method for calculating the current density and internal electric field induced in the human body Low frequency exposure limits have been established in order to limit voltages or currents induced in the human body. These limits always assume that the field in uniform Magnetic field International Electrotechnical Commission Technical Committee 106 6

7 Standard : Method for calculating the current density and internal electric field induced in the human body Current induced in a circular disk by a uniform magnetic field International Electrotechnical Commission Technical Committee 106 7

8 Standard : Method for calculating the current density and internal electric field induced in the human body Current induced in a circular disk by a uniform magnetic field International Electrotechnical Commission Technical Committee 106 8

9 Standard : Method for calculating the current density and internal electric field induced in the human body Current induced in a circular disk by a non-uniform magnetic field International Electrotechnical Commission Technical Committee 106 9

10 Standard : Method for calculating the current density and internal electric field induced in the human body 1,2 1,0 Local µa/m 2 ) 0,8 0,6 0,4 0,2 0, Current induced in a circular Position on disk diameter disk (mm) by a non-uniform magnetic field International Electrotechnical Commission Technical Committee

11 Standards : Method for calculating the current density and internal electric field induced in the human body 1,2 1,0 3D 0,8 homogenous Local µa/m 2 ) 0,6 model of the 0,4 human body 0,2 0, Position on disk diameter (mm) International Electrotechnical Commission Technical Committee

12 Standard : Procedure to determine the Specific Absorption Rate (SAR) for hand-held mobile telephones Phantom specification to measure SAR produced by hand-held mobile telephones International Electrotechnical Commission Technical Committee

13 Project 62233: Measurement methods for electromagnetic fields of household appliances and similar apparatus with regard to human exposure International Electrotechnical Commission Technical Committee

14 Project 62233: Measurement methods for electromagnetic fields of household appliances and similar apparatus with regard to human exposure This standard address the following questions: How to test an appliance for compliance with exposure limits? What type of measuring equipment can be used? At what distance from the source the measurement must be done? How to measure harmonics? How to deal with a non-uniform field? International Electrotechnical Commission Technical Committee

15 Project 62369: Evaluation of human exposure to electromagnetic fields from Short Range Devices in the frequency range GHz - Part 1: Fields produced by devices used for Electronic Article Surveillance, Radio Frequency Identification and similar systems. Electronic Article Surveillance device International Electrotechnical Commission Technical Committee

16 Project 62232: Determination of RF fields in the vicinity of mobile communication base stations used for the purpose of evaluating human exposure International Electrotechnical Commission Technical Committee

17 Project 62110: Measurement procedures for electric and magnetic fields generated by AC power lines with regard to human exposure International Electrotechnical Commission Technical Committee

18 Conclusion TC 106 is developing standards to measure electric, magnetic and electromagnetic fields and to test compliance with exposure limits (conformity assessment). These standards will be general and applicable to any exposure limits. In the low frequency range, TC 106 will develop: Tools to assess the effect of a non-uniform field Calculation method of induced currents using more realistic 2D and 3D human model International Electrotechnical Commission Technical Committee

19 Conclusion In the high frequency range, TC 106 is developing standards on: Measurement methods of electromagnetic fields and Specific Absorption Rate (SAR) Calculation methods of induced currents and SAR Procedures to test compliance with exposure limits (conformity assessment). International Electrotechnical Commission Technical Committee