Frequency-agile wireless sensor networks

Steven W. Arms; Christopher P. Townsend; David L. Churchill; Michael J. Hamel; Jacob H. Galbreath; Steven W. Mundell

doi:10.1117/12.539925

29 July 2004 Frequency-agile wireless sensor networks

Steven W. Arms, Christopher P. Townsend, David L. Churchill, Michael J. Hamel, Jacob H. Galbreath, Steven W. Mundell

Proceedings Volume 5389, Smart Structures and Materials 2004: Smart Electronics, MEMS, BioMEMS, and Nanotechnology; (2004) https://doi.org/10.1117/12.539925
Event: Smart Structures and Materials, 2004, San Diego, CA, United States

Abstract

Our goal was to demonstrate a wireless communications system capable of simultaneous, high speed data communications from a variety of sensors. We have previously reported on the design and application of 2 KHz data logging transceiver nodes, however, only one node may stream data at a time, since all nodes on the network use the same communications frequency. To overcome these limitations, second generation data logging transceivers were developed with software programmable radio frequency (RF) communications. Each node contains on-board memory (2 Mbytes), sensor excitation, instrumentation amplifiers with programmable gains & offsets, multiplexer, 16 bit A/D converter, microcontroller, and frequency agile, bi-directional, frequency shift keyed (FSK) RF serial data link. These systems are capable of continuous data transmission from 26 distinct nodes (902-928 MHz band, 75 kbaud). The system was demonstrated in a compelling structural monitoring application. The National Parks Service requested a means for continual monitoring and recording of sensor data from the Liberty Bell during a move to a new location (Philadelphia, October 2003). Three distinct, frequency agile, wireless sensing nodes were used to detect visible crack shear/opening micromotions, triaxial accelerations, and hairline crack tip strains. The wireless sensors proved to be useful in protecting the Liberty Bell.

Citation Download Citation

Steven W. Arms, Christopher P. Townsend, David L. Churchill, Michael J. Hamel, Jacob H. Galbreath, and Steven W. Mundell "Frequency-agile wireless sensor networks", Proc. SPIE 5389, Smart Structures and Materials 2004: Smart Electronics, MEMS, BioMEMS, and Nanotechnology, (29 July 2004); https://doi.org/10.1117/12.539925

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