The condition of insulating and semiconducting dielectric materials is assessed by a sensor array that uses electric fields to interrogate the test material. The sensor has a linear array of parallel drive conductors interconnected to form a single drive electrode and sense conductors placed on each...http://www.google.fr/patents/US7280940?utm_source=gb-gplus-shareBrevet US7280940 - Segmented field dielectric sensor array for material characterization
Segmented field dielectric sensor array for material characterization