Electrodes For Solid Dielectric Material Analysis - Omicron Lab SPECTANO 100 User Manual

2. Perform the air reference measurement(s) by using SPECTANO Analyzer
8.2

Electrodes for solid dielectric material analysis

The used electrodes should be parallel and must have a proper contact to the
material sample to ensure a good contact and reliable measurement results. Air
inclusions should be avoided.
"Soft" material sample
In this case a proper material contact with electrodes may not be an issue but
the pressure from the electrodes may deform the material sample what can
possibly change the measured permittivity.
"Rigid" material sample
In this case, a deformation of the sample under pressure may not be significant
but as seen in the following figure, areas with no sufficient contact between
electrodes and material sample surface will prevent a homogeneous current
flow through the sample. This leads to measurement results which do not
represent the properties of the material volume.
Material Material
sample sample
Figure 8-3
1. This image is seen in the IEEE Transactions on Dielectrics and Electrical Insulation Vol. 20, No.
Suite as described in 10.4 "Perform air reference measurements" on
page 44.
Note: We recommend adjusting the air space height equal to the thickness
of the sample probe under test. If it is not possible, we recommend
performing two air reference measurements with different air spaces.
Preferably, make a first measurement with the spacer higher than the
sample thickness and a second measurement with the spacer lower than the
sample thickness.
sured permittivity.
mple
formation of the sample under pr ion of the sample under pr
the following figure, areas with n owing figure, areas
nd material sample surface will nd material sa
ugh the sample. This leads to me he sample. This lead
ent the properties of the materia e properties of the m
Bad contact between material sample surface and electrodes
3; June 2013, paper "Enhanced Accuracy in Dielectric Response Material Characterization by
Air Reference Method" from Xiangdong Xu, Tord Bengtsson, Jörgen Blennow and Stanislaw M.
Gubanski.
erial analysis
must have a proper contact to th
and reliable measurement result liable measurement
ontact with electrodes may not b with electrodes ma
odes may deform the material sa y deform the m
permittivity.
mple sur
Setup improvements
ckness
nd
spaces.
er than the he
acer lower than the wer than the
rial analysis
a proper cont
Electrodes
1
25