Open Access. Powered by Scholars. Published by Universities.®
Articles 1 - 2 of 2
Full-Text Articles in Engineering
Optical Fiber Bragg Grating Based Intrusion Detection Systems For Homeland Security, Gary Allwood, Steven Hinckley, Graham Wild
Optical Fiber Bragg Grating Based Intrusion Detection Systems For Homeland Security, Gary Allwood, Steven Hinckley, Graham Wild
Research outputs 2013
This paper describes the use of optical Fiber Bragg grating (FBG) sensors for use in various intrusion detection systems for homeland security. We show that a FBG sensor can be used effectively as an embedded in-ground acoustic sensor, sensitive enough to detect the acoustic emissions associated with walking on a concrete surface. Also, the FBG can be used as an in-ground pressure switch for intrusion detection through temporary flooring materials, such as tiles and wooden laminate. In addition, we verify the use of FBGs as in-fence perimeter breach detectors. Finally, we show how an FBG can be used as a …
High Sensitivity Optically Pumped Quantum Magnetometer, Valentina Tiporlini, Kamal Alameh
High Sensitivity Optically Pumped Quantum Magnetometer, Valentina Tiporlini, Kamal Alameh
Research outputs 2013
Quantum magnetometers based on optical pumping can achieve sensitivity as high as what SQUID-based devices can attain. In this paper, we discuss the principle of operation and the optimal design of an optically pumped quantum magnetometer. The ultimate intrinsic sensitivity is calculated showing that optimal performance of the magnetometer is attained with an optical pump power of 20 W and an operation temperature of 48°C. Results show that the ultimate intrinsic sensitivity of the quantum magnetometer that can be achieved is 327 fT/Hz1/2 over a bandwidth of 26 Hz and that this sensitivity drops to 130 pT/Hz1/2 in the presence …