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Full-Text Articles in Engineering
Microwave Assisted Reconstruction Of Optical Interferograms For Distributed Fiber Optic Sensing, Jie Huang, Lei Hua, Xinwei Lan, Tao Wei, Hai Xiao
Microwave Assisted Reconstruction Of Optical Interferograms For Distributed Fiber Optic Sensing, Jie Huang, Lei Hua, Xinwei Lan, Tao Wei, Hai Xiao
Electrical and Computer Engineering Faculty Research & Creative Works
This paper reports a distributed fiber optic sensing technique through microwave assisted separation and reconstruction of optical interferograms in spectrum domain. The approach involves sending a microwave-modulated optical signal through cascaded fiber optic interferometers. The microwave signal was used to resolve the position and reflectivity of each sensor along the optical fiber. By sweeping the optical wavelength and detecting the modulation signal, the optical spectrum of each sensor can be reconstructed. Three cascaded fiber optic extrinsic Fabry-Perot interferometric sensors were used to prove the concept. Their microwave-reconstructed interferogram matched well with those recorded individually using an optical spectrum analyzer. The …
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 …