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dc.contributor.advisorJia, Yi
dc.contributor.authorZhen, Xu
dc.description.abstractAs crack location and length is one of the key performance parameters that affects the life of mechanical components and civil structures, crack sensing has become one of the most vital technologies in structure heath monitoring. It is desirable that the sensor can be non-obtrusively embedded into the structures or systems to be monitored, whereas, no physical connections for power supply or data acquisition is required. The primary objective of the project is to conduct basic research into the crack sensing mechanism of the proposed passive wireless sensor, aiming at developing a novel crack micro-sensor and fabrication of associated electronics for remote power supply and wireless data acquisition. To this end, a passive wireless crack sensor, being able to operate in crack detecting, has been developed in this research project. The design of the sensor comprises of two major components: an interdigital capacitor (IDC) serving as cracking sensing element and a spiral inductor functioning as passive power source and communication unit. The sensor is activated by electromagnetic wave. The frequency response of the sensor can be monitored by interrogating the sensor remotely with a single loop antenna. The employment of inductor eliminates the conventional wire connection for power supply and data transmission. A model has been established to simulate the sensor working mechanism. With this model, the relationship between resonant frequency of the sensor and crack formation and developing effect was thoroughly investigated. Moreover, sensor performance was analyzed to optimize the sensor configuration, maximize sensing distance, Q factor and sensitivity. The sensor prototype was then successfully fabricated to demonstrate the concept of a crack sensing device using passive wireless communication.
dc.description.abstractLa instrumentación para identificar y medir grietas a pasado a ser una de las tecnologías vitales para monitorear la condición existente de estructuras. Es deseable que los censores de estas tecnologías puedan ser adheridos a estructuras sin que se requiera ningún tipo de conexión física, proveedores de energía, ni sistemas de adquisición de datos. El objetivo principal de este proyecto es llevar a cabo investigación fundamental dentro del área de identificación de grietas, específicamente un censor inalámbrico pasivo. Este objetivo esta orientado al desarrollo de un microsensor, incluyendo la fabricación de sus componentes electrónicos, los cuales tendrán capacidad de recibir energía remota y adquirir datos en forma inalámbrica. En el presente proyecto se desarrolló un detector de grietas inalámbrico que consiste en 2 componentes principales: un capacitor interdigital (IDC) que trabaje como elemento sensorial de agrietamiento y un inductor espiral que sirve como fuente de energía pasiva y unidad de comunicación. El censor se activa por ondas electromagnéticas y su respuesta en frecuencia es monitoreada por la acción remota de una antena de circuito simple. El desempeño del censor fue analizado con el fin de optimizar su configuración, maximizar la distancia sensorial, estudiar el factor Q y su sensibilidad. Un prototipo fue construido para demostrar el dispositivo de detección de grietas usando comunicación inalámbrica pasiva.
dc.description.sponsorshipNational Science Foundation Grant 0549338 and DE-FG26-07NT43061en_US
dc.subjectwireless crack sensoren_US
dc.subject.lcshDetectors--Design and constructionen_US
dc.subject.lcshStructural health monitoringen_US
dc.subject.lcshCapacitors--Design and constructionen_US
dc.titleWireless interrogation of passive crack sensoren_US
dc.rights.licenseAll rights reserveden_US
dc.rights.holder(c) 2010 Xu Shenen_US
dc.contributor.committeeValentín, Ricky
dc.contributor.committeePortela, Genock
dc.contributor.representativeGonzalez, Ana Engineeringen_US
dc.contributor.collegeCollege of Engineeringen_US
dc.contributor.departmentDepartment of Mechanical Engineeringen_US

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