Low Cost IEMI Detector. In: Electromagnetic Compatibility (EMC Europe), 2015
International Symposium on:WS26 Workshop on IEMI Effects on Critical Infrastructures:
The European Project STRUCTURES. .
eprints@whiterose.ac.uk https://eprints.whiterose.ac.uk/
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IEMI Detection Systems:
A low cost IEMI detector
J F Dawson, L Dawson, I D Flintoft, L Rebers,
Michael Camp, Juergen Schmitz, Markus Jung
System Concept
Conducted
IEMI Detector
Radiated
IEMI Detector
Radiated
IEMI Detector
Comms
interface
PC
(Laptop/Server)
Fibre Optic/Wireless/LAN links
USB
Software:
Logging Display &
Radiated IEMI Sensor
Sensor Frequency Response
0.01 0.1 1 10
0.2 0.25 0.3 0.35 0.4 0.45 0.5 0.55 0.6 0.65 0.7
Detector and log amp dc output for detector in stripline
Frequency (GHz) O u tp u t (V )
Sensor CW Dynamic range
0.1
1
10
100
0.1
1
10
100
Detector and log amp field in stripline fitted cal and computed AF
Input field (V/m)
D
e
te
c
to
r
F
ie
ld
(V
/m
)
Detector Assembly
Prototype detector, microcontroller, optical
link, and batteries in shielded enclosure
High Field Tests at RMW
Microcontroller
Fibre-optic
Interface
Radiated IEMI
Sensor
Battery
Fibre-optic
to USB
Interface
PC
Integrated D-dot probe output
Low cost detector Status
•
Useable Radiated detector up to 6~GHz
•
Frequency response flat to 2GHz
–
Sensitive 2V/m to > 4kV/m
•
Partial response to short pulses
–
Sensitive 200V/m to > 4kV/m for 250ps pulse
•
Potential for low power operation
–
could be solar powered
IEMI Detection Systems:
A system for sensing, localization and
identification of IEMI attacks
W
H
M
S
M
Rubenstein, Benjamin Menssen, Heyno Garbe
Overall Architecture
Overall architecture for identification and localization system for IEMI sources
•
Localization by the time difference of arrival method
Ideal architecture
Balun
Sensor
E
O
Optical fibre
O
E
Detector /
Digitizer /
Receiver
Computer
Balun
E
O
Optical fibre
O
E
Detector /
Digitizer /
Receiver
Sensor
.
.
.
N× sensor
Block Diagram for one sensor
Block diagram for one sensor
•
Electric-field sensor
•
Signal Conditioning
•
Amplitude Measurement
•
Single bit digitizer
•
Time domain waveform checking
•
Processing unit
Estimations of waveform parameters
Single pulse double exponential
•
Estimating time constants
–
From timing two threshold crossings we can obtain the two time constants
)
(
ln
)
(
2B
2A
A
B
1
t
t
V
V
)
(
ln
-A
0
2A 2B B A2A
t
t
V
V
t
e
V
V
V
B
≅
V
0
e
− ′
t
2 B
τ
11 B 2 A 2
)
(
B
A
t
t
e
V
V
V
A
≅
V
0
e
− ′
t
Estimations of waveform parameters
Damped sinusoid
Damped sinusoid
•
Estimating decay time constant and fundamental frequency
T
V
e
t
)
T
ln(
V
t
)
ln(
2
1
2
TV
f
m
)
ln(
2
1
2
TV
f
m
f
m
m Startt
,
/
f
m
m End
Estimations of waveform parameters
Continuous wave
Continuous Wave
•
Estimating fundamental frequency
D
t
n
=
(
n
−
1)
π
2
π
f
D
t
n
=
π −
2arcsin(
V
T
)
+
(
n
−
2)
π
2
π
f
n
t
n
f
2
1
nt
n
V
f
2
)
2
(
)
arcsin(
2
TIf n is odd
If n is even
If n is odd
Specifications of the demonstrator
•
System able to accept large dynamic in amplitude &
frequency
–
Amplitude dynamic range : min 100 V/m; max 20 kV/m
–
Frequency dynamic range : a few hundred Hz -> 1 GHz
•
Amplitude measurement with fast transition and rise
time in case of the pulse signal
–
lowest rise time = 300 ps
KC705 Evaluation Board for the Kintex-7 FPGA
•
Main reason for the choice
•
High-performance transceivers capable of up to 12.5 Gb/s;
the demonstrator of the Structures project runs at 8 Gb/s
System assembly
Interface Board Sensor board
Hardware results & measurement
Hardware results & measurement
Peak-hold with pulse signal
