Transcript Revue on RF Safety Reference Levels and Measurement protocols Christian BLANCHARD CEO

ITU-T Workshop on
Delivering Good Quality Telecommunication Service
in a Safe Environment in Africa
(Nairobi, Kenya, 26 July – 27 July 2010 )
Revue on RF Safety Reference Levels
and Measurement protocols
Christian BLANCHARD
CEO
Planet Network
International
Nairobi, Kenya, 26 – 27July 2010
Revue on RF Safety
Levels
Revue onReference
RF Safety Reference
Levels and
andprotocols
Measurement
Measurement
protocols
CONTEXT
CONTEXT
Samsung (Netherlands) cancel delivery of 140 000
non compliant mobile phones
BASE STATION DISMANTLING IN FRANCE (decision
taken by the court of law):
 Bouygues Telecom : 4 Feb 2009 – Tassin demi-lune
 SFR : 16 Feb 2009 – Carpentras
 Orange : 5 Mar 2009 – Notre Dame d’Alençon
How to maintain the
coverage by reducing
the level of exposure to
very low level ?
IN FRANCE
Grenelle des antennes
ICNIRP
International Commission on Non-Ionizing Radiation Protection
Thermal effects
/10
/5
-
SAR full
body
+
+
4 W/kg
0,4 W/kg
SAR Local 10 g
2 W/kg
4 W/kg
SAR : Specific Absorption Rate
Basic Restrictions
0,08 W/kg
Normative SAR Measurement
Probe
Voltmeter
liquid
phantom
positioning
device
Base station emulator
robot
Control
Software
tables
Normative SAR Measurement
2 Steps for SAR
measurement:
• Area scan
 4mm from the phantom surface
 8mm between each point
• Volume scan above the maximum
position
 From 175 to 350pts (5 to 10min)
 Mean value of the DAS value in a
volume of 10 or 1g
– 10g : 21mm cube
– 1g : 10mm cube
7
Reference Level
Reference levels
complex
long
expensive system
E in V/m
SAR Measurement is :
140
130
120
110
100
90
80
70
60
50
40
30
20
10
0
travailleur
Gd public
0
500
1000
1500
2000
2500
Frequency en MHz
 ICNIRP has defined, in parallel of Basic
Restriction, the Reference Levels
(measurement of electromagnetic field)
defined by simulation, conservative.
92 V/m
42 V/m
127 V/m
58 V/m
3000
Workers / General Public limits
E field in V/m
ICNIRP defines 2 categories for human exposure:
• workers (short exposure duration)
• public (long exposure duration)
140
130
120
110
100
90
80
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60
50
40
30
20
10
0
travailleur
__ Worker
Gd public
__ General
Public
0
500
1000
1500
2000
Frequency in MHz
2500
3000
Workers exposure limits
In Europe …
Which levels
to refer to?
How to
measure
Levels?
The workers exposure limits follow the European directive
2004/40/CE of 29 April 2004 for limiting exposure to electromagnetic
fields. This directive has to be transposed in the law of the members
of the EC and is based on ICNIRP Reference level
CENELEC: As a result of the acceptance of the European
Directive 2004/40/EC, the European Commission has given a
Mandate M/351 to CEN/CENELEC, dated June 2004, to
develop harmonized standards for the assessment,
measurement and calculation of workers' exposure to static
magnetic and varying electric, magnetic and electromagnetic
fields with frequencies from 0Hz to 300GHz.
 no protocol adopted for the moment
Workers exposure limits
CENELEC European Directive 2004/40/EC  CENELEC TC 106 WG 4
Obligation for employer to guarantee the safety of their workers (level of
exposure must remain under the ICNIRP reference level). Each country has its
own philosophy to make the site safe:
• definition of the emitters
• definition of the security perimeters
by “manual” calculation
by simulation using software
If obligation of standing near an emitter
or in the case of co-sitting site, maintenance,
to prevent unexpected emission.
control levels using dosimeter
E field in V/m
Workers / General Public limits
140
130
120
110
100
90
80
70
60
50
40
30
20
10
0
travailleur
__ Worker
Gd public
__ General
Public
0
500
1000
1500
2000
Frequency in MHz
2500
3000
Public exposure limits
In France …
•In France, the decree of May 2002 (n°2002-775) follows the European
recommendation (ICNIRP).
Verified by licensed companies that
makes selective measurement with
INSITE Free
Public exposure limits
In Switzerland
Measurement protocol for assessment of public sites
In Europe...
ECC RECOMMENDATION (02)04
MEASURING NON-IONISING ELECTROMAGNETIC RADIATION (9 kHz – 300 GHz)
• This Recommendation specifies in-situ measurement procedures in order to assess
electromagnetic fields for the purpose of comparison against limits for human exposure applying in
CEPT countries.
• The French protocol measurement is based on this recommendation, considering the three
decision levels, performing first a broadband scanning with isotropic probes, then a selective
frequency check in those places where the first decision level (field higher then 0.28 V/m) is
exceeded, and a detailed analysis when the second decision level (>2.8 V/m) is also exceeded.
Measurement protocol for assessment of public sites
Example: ANFR In-Situ Measurement Process
Broad band measurement
Selective measurement
Particular case study
Limitation of in-Situ Protocol
Limitation of in-Situ Protocol: These measurement are limited in time…
Monitoring solution
using INSITE Box
…and space
Mobile solution
using EME Spy
Example of site analysis using several RF Safety tools
Site overview:
Emitting
antenna
Public
Area
Example of site analysis using several RF Safety tools
Fixed monitoring using INSITE Box :
Mobile monitoring using EME Spy :
In-Situ measurement using INSITE Free :
Example of site analysis using several RF Safety tools
Using INSITE Box:
Evolutions des champs électriques mesurés le 21/11/2005 par la station DM_002_4205
2,00
1,80
1,60
1,20
1,00
GSM Rx
0,80
0,60
Mean : 1,49 V/m
Maximum : 1,88 V/m
Minimum : 1,03 V/m
0,40
0,20
0,00
00
:0
0:
00
01
:3
0:
00
03
:0
0:
00
04
:3
0:
00
06
:0
0:
00
07
:3
0:
00
09
:0
0:
00
10
:3
0:
00
12
:0
0:
00
13
:3
0:
00
15
:0
0:
00
16
:3
0:
00
18
:0
0:
00
19
:3
0:
00
21
:0
0:
00
22
:3
0:
00
00
:0
0:
00
champ (V/m)
1,40
temps (hh:mm:ss)
Example of site analysis using several RF Safety tools
Using EME Spy:
1,80
1,60
1,40
1,20
1,00
0,80
0,60
0,40
0,20
0,00
0
50
100
150
200
250
300
350
400
450
Example of site analysis using several RF Safety tools
Using INSITE Free:
Channel 6 : f= MHz ; E=0,6 V/m
Channel 37 : f=942,4 MHz ; E=0,9 V/m
Channel 43 : f=943,6 MHz ; E=0,2 V/m
Total field=1,1 V/m
Extr. Field=1,9 V/m
END of The Presentation
Thank You!
Nairobi, Kenya, 26 – 27 July 2010
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