Справочник Пользователя для Infinition Inc BR-3503
Infinition Inc.
March 23, 2010
Safety Warning Justification
BR-3503 Doppler Radar
Safety warning contained in the BR-3503 User Manual:
“Based on limits specified by the Federal Communication Commission (FCC) on Radio Frequency (RF)
emissions in a general population environment, continued exposure to radiation should be avoided within
0.5 meter in front of the radar. Radiation levels outside this region fall within regulations of 1 mW/cm
2
and
are not considered safety hazards. When setting up the antenna, special care should be taken to avoid
situations where the antenna radiates towards individuals. The antenna should be positioned such that
bystanders are located behind the antenna. During antenna setup, the antenna power cord should be
unplugged to avoid accidental hazardous exposures to radiations. Always turn the antenna transmitter off
during periods of inactivity. Direct visual contact with the radar when transmitting should be avoided at all
times.“
The maximum permissible exposure for general population / uncontrolled situations is obtained as follow:
Radar Specifications
Transmitter Frequency:
situations where the antenna radiates towards individuals. The antenna should be positioned such that
bystanders are located behind the antenna. During antenna setup, the antenna power cord should be
unplugged to avoid accidental hazardous exposures to radiations. Always turn the antenna transmitter off
during periods of inactivity. Direct visual contact with the radar when transmitting should be avoided at all
times.“
The maximum permissible exposure for general population / uncontrolled situations is obtained as follow:
Radar Specifications
Transmitter Frequency:
35.5 GHz
Transmitter Power:
100 mW or 0.1 W
Antenna Gain:
28 dBi
Limits for General Population/Uncontrolled Exposure
Frequency Range:
1500 – 100000 MHz
Power Density:
1 mW/cm
2
or 10 W/m
2
Averaging Time:
30 minutes
Based on the radar equation, the power density at a given distance can be calculated as follow:
PD
R
P
G
=
2
10
/
*
*
4
*
10
π
where
G
is the antenna gain [dBi]
P
Transmitter
Power
[W]
R
Range
[m]
PD Power
Density
[W/m
2
]
The minimum range for a safe exposure based on the radar specifications is given by:
m
PD
P
R
G
70
.
0
*
4
*
10
1
.
0
*
10
*
4
*
*
10
10
/
28
10
/
=
=
≥
π
π
where
G = 28 dBi
P
=
0.1
W
PD = 10 W/m
2
Exposure to radiation should be avoided within 0.70 meter in front of the radar. For additional safety, the
minimum range specified in the safety warning has been increased to 1.0 meter.