Passive, Highly-Sensitive, Room-Temperature Magnetic Field Sensors and Arrays for Detection and Imaging of Hidden Threats in Urban Environments.

摘要

This material is based on research sponsored by the Defense Advanced Research Projects Agency (DARPA) under agreement number FA8650-09-1-7945. The U.S. Government is authorized to reproduce and distribute reprints for Governmental purposes notwithstanding any copyright notation thereon. Virginia Tech has achieved noise floors of about 1pT/root of Hz at f=1Hz in passive sensors operated at room temperature that consisted of magnetostrictive Metglas layers bonded to piezoelectric PMN-PT single crystal fiber ones. These noise floors were benchmarked by our international team members at the University of Caen. Furthermore, Passive Sensors has developed 3x3 arrays of ME sensors, also achieving noise floors on the order of 1pT/root of Hz at f=1Hz. Working together Virginia Tech and University of Caen have developed gradiometers with high common mode rejection efficiencies, enabling real world applications. Overall the investigations have clearly identified Metglas/PMN-PT tri-layer laminates as the superior technology.