ELABORATION OF THE METHOD AND SYSTEM MEASUREMENT OF THE HPEM ELECTRICAL PARAMETERS

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Symposium on Appl
ied Electromagnetics


Sopron, Hungary, June 3
-
6, 2012



1



ELABORATION OF THE METHOD

AND

SYSTEM

MEASUR
EMENT

OF

THE

HPEM

ELECTRICAL PARAMETERS
1



M
.

Kuchta,
Z. Sokołowski, M. Szulim
,
R
.

Kubacki


Military University of Technology
, Faculty of E
lectronics


2 gen

Kaliskiego
str.
, 00
-
908 Warsaw, Poland
, e
-
mail:
mkuchta@wat.edu.pl


Introduction



The term

HPEM

(High

Power

ElectroMagnetic
) is understood as
extremely

high
-
power

pulses

of electromagnetic radiation.

In general t
hey can be divided

into two categories:

HPEM operat
ing in the low frequency range and
HPM

pulses

(High

Power

Microwaves
)
at
microwaves. T
heir

basic properties

are illustrated

in Figure 1

and Table below:

HPEM


HP
E
M

HPM



carrier
frequency f
0

few Hz to

300 M
Hz



carrier
frequency f
0

0,
3

to 100

GHz



electric field
strength

100 kV/m



electric field
strength

200

kV/m



rise time < 10 ns



rise time 50 ps
-

0,5 ns



repetition time

0

to

10 s



repetition time

0,
1
to

10 s



pulse width


5

ns
to

1
00

n
s



pulse width


0,5 ns
to

10

ns



pulse recurrence
frequency from single
pulse to 1kHz



pulse recurrence frequency from single
pulse to tens of kHz

Fig. 1.

Description of the HPEM signal

Measurement methods



For measuring
of s
uch

pulse
s

the following electro and magneto
-
optic methods
can be
used
:




Method Based on
Faraday’s Induction Law
,



Method Based on Magneto/Electro
-
Optic Effect
)
,


From the analysis of

the methods used

to measure

electromagnetic fields, the

magneto
-
optic

method was chosen
.
It allows

to measure

the magnetic component of

the
field

without interfering with the

structure of

the investigated system.




1

This work was supported by the National Center for Research and Development (Grant no 0R00006311)

f
o

czas
T
Symposium on Appl
ied Electromagnetics


Sopron, Hungary, June 3
-
6, 2012



2

The concept of

the HPEM
/HPM

signal

transducer

and

the
measuring signal
detector

At the core of

the concept of

the
HPEM

signal

transducer

lays

the idea of
using

a
physical

phenomenon

associated with

changes in

the electromagnetic field
.

One of them is

the
Faraday’s

phenomenon

involving

twisting

the polarization plane
,
polarized
light

by

optically

inactive

substances
,
when placed in

the magnetic field

lines

parallel

to the
direction of

the light beam

passing through

(Fig. 2)
.


Fig. 2.

Rotation of the plane

of polarization

under the influence of

magnetic field


Measuring system



The test system

uses the

phenomenon of changes in

the plane of

light

polarization
under the influence of

strong magnetic field.

To minimize the impact

of the measured signal

transmitter and receiver

can be placed

under protection from

electromagnetic radiation.

The
use of

fiber

in the

transmission

path

of the measuring signal

also aims to

reduce the impact of

interference

occurring in

the test leads
.

The position

is composed of

the following elements:

1.

Laser

transmitter

-

in order to

study the effect of

the wavelength of the laser radiation
of

the transmitter

three

sources with

different wavelengths

are used(53
2nm, 660nm i
808nm),

2.

The input

system

of the laser beam

into

a fiber

path
,

3.

The
system

forming

laser beam

after emerging from

the fiber

combined with a

polarizer
,

4.

An element

made
of a material

with high

Verdeta factor
, which
changes the

polarization plane

passing through

the

laser beam in a strong

electromagnetic field
,

5.

The analyzer (polarizer
)

system,

6.

The system

collecting and

placing

laser

beam

into

a fiber

path.

7.

Fiber track,

8.

The laser

detection system,

9.

Data collecting system.


References

[1]

Drexler

P.
,

Fiala

P
., ,

Methods for high power EM pulse measurement

,
IEEE

Waveform Diversity &
Design
,
1
-
4244
-
1276
-
5/07/$25.00©2007
, 2
8
-
3
1

[2]
Trzaska H
.
,
Pomiary pól elektromagnetycznych w polu
,
W

N PWN Warszawa
-
Wrocław
,
1998

[3]
CRAIG, A. E., CHANG, K.
Optical Modulation: Magneto
-
Optical Devices. Handbook of Optical
Components and Engineering.
New Jersey: John Wiley & Sons, Inc., 2003.
1380 pages. ISBN 0
-
471
-
39055
-
0