Measurement of relative permittivity for tissues and fluids

Our team is able to determine the relative permittivity of tissues or fluids. This is often necessary for the field of sensor evaluation in order to carry out feasibility analyzes with novel sensors or to properly validate the sensor system. In certain situations, the analysis of the relative permittivity of a material, tissue or fluid is necessary for the determination of the respective constituent materials. Especially in the field of medical technology, more and more electromagnetic waves are used for diagnostic purposes. For this reason, more and more sensors are being developed that deal with the subject of measurement of electromagnetic waves.

General Information about the measurement of dielectric properties:

In simple terms, the permittivity describes the permeability of the material to electric fields. The permittivity can be considered complex-valued: ε = ε’ + ε”. The real part ε’ defines the energy which is stored in the matter when an external electric field is applied. The imaginary part ε” is a measure of the proportion of electromagnetic field energy, which is converted into heat.

Influencing factors:

The measurement of dielectric properties are strongly dependent on environmental influences, for example the temperature. Therefore, these dielectric properties are comparable only if the boundary conditions with respect to the incoming parameters are defined.

Measurement setup:

The senetics test laboratory has the ability to determine the permittivity of materials. The measurement method is based on the measurement of wave quantities at the input of a coaxial line. In this case, the wave sizes of the input and output shafts are recorded in the form of S‑parameters. The returning wave is the result of reflections. These reflections arise at the interface between two waveguides with different transmission properties. The parameter relative permittivity (ε) describes these interactions between matter and electromagnetic waves.

If you would like to know the permittivity of your substance/material in the frequency range from 10 MHz to 26 GHz, then you are right in the senetics test laboratory! The tests are of course carried out carefully and by qualified personal.

If you have questions, please feel free to contact us!