A new approach in electromagnetic tomography has been developed for non-invasive detection of highly explosive materials or other highly dielectric materials. The traditional approach to electromagnetic tomography usually only reconstructs the conductivity images; our computerized capacitance approach can reconstruct small-scale dielectric images.
The derivation of the exact field reconstruction equation gives strong support to the approach and provides theoretical guidance toward formulating the system equation of reconstruction. The approximate field method is introduced to formulate a system equation of reconstruction which just takes a few seconds to accomplish the reconstruction process. This is fast enough for the system to be a real time system. The complement field method makes our approximate field model reconcile the theoretical strictness with the ability of real time reconstruction.
The experimental device we have built does detect the existence and the location of the sample objects we put into the sensor system.