Annual Report 2012 - Latvijas Universitātes Cietvielu fizikas institūts

where ε o – vacuum dielectric constant, τ=CpRp – Maxwell relaxation time of charge
carriers in bulk of sample, Cp, Rp - parallel circuit elements. The results of this study are
presented by 3D graphs in Fig.3.
18
16
1
14
2
12
10
Y Axis
3
8
6
4
2
1,0x10 10
8,0x10 9
6,0x10 9
4,0x10 9
2,0x10 9
0,0
18
16
14
12
10
8
6
4
2
X Axis
M"(w, m)
18
16
14
12
10
8
6
4
2
0
18
16
14
12
10
8
6
4
Fig.3a. M′′(ω, m) data 3D presentation for Fig.3b. M′′(ω, m) data 3D presentation for
(0i) regions:
(2i) regions:
1-τ1=3E-8 sec
1-τ1=2E-5 sec
2-τ2=2E-7 sec
2-τ2=7E-7 sec
3-τ3=2E-6 sec
3-τ3=1E-4 sec
X Axis: matrix data for frequency 100 Hz – 15 MHz , Y Axis: matrix data for water content 0.35 – 0,08 g
2
1
Y Axis
3
2
X Axis
5x10 9
4x10 9
3x10 9
2x10 9
1x10 9
M"(w, m)
The fixture electrode isolation method can helped to identify influence of moisture on
the electrical properties of the fabrics based on glass fibers. The 3D plot of imaginary
part complex modulus M′′(ω, m) can be good methodology to control water influence on
electrical properties of metal coated and non coatd fabrics.
The Impedance spectroscopy is powerful tool for moisture control and to study the
interaction of environment moisture with metal particles on the fibers and the influence
on physical and chemical properties (corrosion of coatings) and functionality of
technical textiles. ). Moisture is the cause of the change in resistance time domain of
fabrics in the form of electrochemical noise as result of moisture caused metal coating
corrosion.
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