Broadband spectral electrical imaging for surface and borehole applications
Key challenges in a nutshell
- Broadband spectral electrical imaging
- Electromagnetic coupling effect mitigation
- Interpretation with regards to hydraulic parameters
Short description of the technology
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.
State of the Art: technology in existing gravitational wave detectors / TRL
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.
Intended use in the frame of 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.
Improvements needed: Technological challenge for the Einstein Telescope
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.
Economic perspectives of participation beyond the ET applications
We are open to any companies’ proposals.
Related projects and labs
Ongoing and future procurements
TDIP is mainly planned in E-TEST and SIP at the column scale.