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Remotely Queried Embedded Microsensors
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Embedded Sensors are tiny wireless sensors and data acquisition system that are small enough to be embedded in a product, enabling the creation of smart structures, smart materials and smart machines. These tiny nodes can be placed within implants, on spinning machinery and within composite materials. Batteries are completely eliminated which means that the sensors and its node can be queried for the life of the structure. The RQEM sensors use an inductive link to receive power from an external coil and to return digital strain, temperature and unique ID information. These tiny devices can be embedded in buildings, bridges, and vehicles to continuously monitor their "health", from the inside out. The sensors provide an early-warning system for assessing damage before safety issues arise, and can help extend a structure's life by prioritizing the need for preventive maintenance. Thus we see how Remotely Queried Embedded Microsensors are used in structural monitoring and diagnosis. It is better than its predecessor - the fiber optic embedded sensors for the various reasons we mentioned earlier. An integrated embedded sensor package has been developed to measure strain and temperature within a composite structure. The sensor system includes a transponder and a signal conditioning electronics integrated with conventional strain gauges. Research is still going on in the design of sensors to give the sensed data with more accuracy and precision. These sensors when coupled with microcontrollers and microactuators will bring a revolution of automated Ëœsmartâ„¢ devices ranging from micro to macro. Embedded sensors enables a new generation of smart structures and smart materials, the possibilities are endless.
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Microelectronic Pills
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i want documentation of 30 pages on remotely queried embedded microsensors
Post: #4

Project Update: Applied Research on
Remotely-Queried Embedded Microsensors

Donald Krantz1, John Belk2, Paul J. Biermann3, Joel Dubow4, Lee W. Gause5,
Ramesh Harjani6, Susan Mantell6, Dennis Polla6, Philip Troyk7
1 MTS Systems Corporation, 2 The Boeing Company, 3 Applied Physics Laboratory of Johns Hopkins University,
4 University of Utah, 5 Naval Research Laboratory, 6 University of Minnesota, 7 Illinois Institute of Technology


Sensors embedded in structural composites have been a topic of research in recent years. Embedded sensors can be used to monitor and optimize the manufacturing process, to monitor performance during use, and for structural health monitoring in highperformance applications. For several years, embedded optical fibers were the predominant type of sensor. There are well-known reasons that optical fiber sensors have not yet been fully embraced in industry including the cost of equipment and sensors, the fragility of the optical fiber itself, and the need to provide ingress and egress from the structure. Recent work by the authors and others has produced prototype wireless electronic sensors of various types that address these shortcomings. The US Office of Naval Research is funding a multidisciplinary team to consolidate progress made in earlier programs towards self-contained microsensors to be embedded in a composite structure and queried using methods that do not require physical connections. The sensors are to be left in place for the lifetime of the structure, are powered by the querying apparatus, and require no penetrations through the surface of the structure. This paper describes the integrated approach taken to realize the goal of an interrogatable strain rosette that is embedded 0.25” below the surface of a graphite composite plate. It also describes the progress to date of the sensor system itself.

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