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Underwater EIT Follow-on Project

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Final rept.

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This final report summarizes the findings obtained during the Underwater EIT Follow-on project carried out between January and October 2008 Contract No. W7702-07R159001EDM. The project was intended to characterize the EIT sensing modality in various underwater conditions in view of future development of a sensing platform capable of operating in shallow water areas likely to hold mines or unexploded ordnance buried in underwater sediment. This type of environment is challenging for most landmine detection sensors. In collaboration with DRDC Suffield in 2003-04 and in 2005-06, Neptec undertook small-scale laboratory testing of an EIT instrument in an underwater environment. This follow-on research project was designed to further evaluate the suitability of EIT for the underwater application. The main project objectives included experimentation with variations on the EIT reconstruction algorithms, using the EIDORS framework simulation and lab experimentation to evaluate the effects of electrode pitch on system performance evaluation of EIT performance in various likely conditions for an underwater application, namely different levels of water turbidity, water salinity, and target rusting comparison of EIT performance to underwater performance of a traditional EMI metal detector, under varying salinity levels. The laboratory experiments indicate that water turbidity and target rusting have little effect on EIT performance. Salinity at low levels does not affect EIT reconstruction quality, but at seawater levels detection is compromised. This failing is likely due to the material properties of the electrodes. The traditional EMI detector used for comparison also deteriorates with increasing salinity, but performs better than the EIT instrument at the salinity levels of seawater.

Subject Categories:

  • Magnetic and Electric Field Detection and Detectors
  • Ammunition and Explosives
  • Land Mine Warfare

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