SGER: Field Programmable Magnetic Surface Acoustic Wave (SAW) Devices for Hybrid Sensor Networks

ecs - 0632523 p。该研究旨在开发无源（无电池）磁传感器，以适应复杂传感器网络中的无线询问。该装置是基于表面声波（saw）在压电衬底中的传播速度，由于上覆磁膜的电阻响应外部磁场而变化。为了实现本提案的目标，PI计划在压电基板上设计和制造基于声电效应波（SAW）的传感器。这是在SAW衬底上集成磁阻（MR）薄膜的第一个例子，传感器信号表现为脉冲延迟而不是幅度变化，从而提供更好的识别。该活动将通过进一步集成天线和反射器来探索选择性可编程识别（ID）类型设备的特征。该项目将有助于建立无源和现场可编程SAW设备的可能性，因为用于热写入的射频信号能量尚未报道。广泛影响：该项目为无源无线设备的潜在应用开辟了一个新的领域，包括电流传感、位置传感、结构健康监测，如果生物化学功能化，还包括环境监测。此外，由于它们不需要电池，并且它们的数据可以通过无线查询检索，传感器可以用于偏远和难以到达的地方。建议的研究将在1名研究生和1名本科生的协助下进行。PI积极参与本科生的高级项目，并带来多样性和教授新课程。

ECS-0632523P. Dhagat, Oregon State UniversityThe research aims to develop passive (battery-less) magnetic sensors amenable to wireless interrogation in complex sensor networks. The devices are based on the propagation velocity of surface acoustic waves (SAWs) in a piezoelectric substrate changing due to the resistance of an overlying magnetic film responding to external magnetic fields.Intellectual Merit To accomplish the goals of this proposal the PI plans to design and fabricate sensors based on acousto-electric effect waves (SAW) on a piezoelectric substrate. It is the first example of an integration of a magnetoresistive (MR) film on SAW substrates and the sensor signal manifest as a pulse delay instead of an amplitude change providing better discrimination. The activity will explore selectively programmable identification (ID) type device feature by further integration with antenna and reflectors. This project would help to establish the possibilities of passive and field programmable SAW devices since RF signal energy for thermal writing has not been reported yet. Broad Impact: This project opens a new venue for potential applications of passive, wireless devices including current sensing, position sensing, structural health monitoring and, if bio-chemically functionalized, environment monitoring. Further, as they require no battery and their data can be retrieved by a wireless query the sensors may be used in remote and inaccessible locations. The proposed research will be conducted with the assistance of 1 graduate and 1 undergraduate student. The PI is intensely involved in undergraduate students senior projects and by bringing diversity and teaching new courses.