Broadband spectral electrical imaging

Technological Challenge

Spectral electrical impedance tomography (EIT) yields the spatial distribution of the complex electrical conductivity from the mHz to kHz through the collection of a large amount of impedance data through electrodes and subsequent processing (solving an inverse problem) of the data to produce images.

Time domain induced polarization tomography and DC resistivity tomography are considered state of the art. For broadband results, spectroscopic studies are mainly deployed at the laboratory scale and a few case studies exist at the field scale.

Relation to the Einstein Telescope

Relation to the Einstein Telescope

There is an important interest to correlate the obtained properties with hydrogeological properties such as the hydraulic conductivity in a tomographic framework.


It is still challenging to make accurate EIT measurements in the field for frequencies above 50 Hz. When long multicore cables are present, many applications have been limited to frequencies below 10 Hz due to electromagnetic coupling effects (surface or borehole configuration). There is therefore a need to develop dedicated shielding to reduce this effect and to develop correction algorithm to account for them.

Industrial relevance and further application fields

We are open to any companies’ proposals.


For further information and more details about this technology field, please check the following Einstein Telescope Design Reports.

E-TEST Conceptual Design Report:

Einstein Telescope Conceptual Design Report:
Site and Infrastructure: Pages 161-192

Contact to the Einstein Telescope ecosystem

Are you active in this field of technology? Do you have an innovative approach to meet the requirements for Broadband spectral electrical imaging for surface and borehole applications ? Then take note of our tenders, join our challenges or simply get in contact with us. Furthermore, you can take a look at the mapping displaying the ET-relevant cempetencies in the EMR-Region. If you would like to be part of this mappink, please contact the business development managers.

Business development contacts

Peter Gier

Matthias Grosch

Michel Stassart
Skywin BE –

Annick Pierrard
ULiège RISE BE –

Maxime Corvilain
POM Limburg BE –

René Kessen

Scientific contacts

Frédéric Nguyen

ULiège BE –