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Smart Feedback Control For Fiber-Optics Acoustic Emission Sensor System, Xiangyu Luo
Smart Feedback Control For Fiber-Optics Acoustic Emission Sensor System, Xiangyu Luo
Department of Electrical and Computer Engineering: Dissertations, Theses, and Student Research
Optical fiber sensors for ultrasonic detection have become a subject of much research in recent years. In this thesis, a fiber-optic acoustic emission (AE) sensor system that is capable of performing AE detection, even when the sensor is experiencing large quasi-static strains, is first described. The system consists of a smart selection of a wavelength notch to which a distributed feedback (DFB) laser is locked for high sensitivity AE signal demodulation. A smart feedback control unit for the DFB laser, which is the focus of this thesis, is designed and investigated. The smart control ensures that the AE signal is …
Classification Of Military Ground Vehicles Using Time Domain Harmonics’ Amplitudes, Peter E. William, Michael W. Hoffman
Classification Of Military Ground Vehicles Using Time Domain Harmonics’ Amplitudes, Peter E. William, Michael W. Hoffman
Department of Electrical and Computer Engineering: Faculty Publications
In the context of the United Nations peacekeeping operations, we developed an energy-efficient method for the detection and classification of military vehicles using a group of wireless sensors. The method is adequate for low-power unattended sensors which perform sensing, feature extraction, and classification in a standalone scenario. Harmonics’ amplitudes approximating the harmonic signature of the time domain acoustic signal captured by wireless sensor nodes are estimated for vehicle discrimination. The computational complexity for the time domain features extracted from ground vehicles’ acoustic signals is lower than their equivalent spectral features. Classification is performed using a multilayer feed forward neural network, …