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Sensing resolution and measurement range of a passive wireless strain sensor

Research output: Chapter in Book/Report/Conference proceedingConference contributionScientificpeer-review

Details

Original languageEnglish
Title of host publicationStructural Health Monitoring 2011: Condition-Based Maintenance and Intelligent Structures - Proceedings of the 8th International Workshop on Structural Health Monitoring
Pages759-766
Number of pages8
Volume1
Publication statusPublished - 2011
Publication typeA4 Article in a conference publication
Event8th International Workshop on Structural Health Monitoring 2011: Condition-Based Maintenance and Intelligent Structures - Stanford, CA, United States
Duration: 13 Sep 201115 Sep 2011

Conference

Conference8th International Workshop on Structural Health Monitoring 2011: Condition-Based Maintenance and Intelligent Structures
CountryUnited States
CityStanford, CA
Period13/09/1115/09/11

Abstract

In this research, folded patch antennas are explored for the development of low-cost and wireless smart-skin sensors that monitor the strain in metallic structures. When the patch antenna is under strain/deformation, its resonance frequency varies accordingly. The variation can be easily interrogated and recorded by a wireless reader that also wirelessly delivers power for the antenna operation. The patch antenna adopts a specially selected substrate material with low dielectric constant, as well as an inexpensive off-the-shelf radiofrequency identification (RFID) chip for signal modulation. This paper reports latest tensile test results on the strain sensing limit of the prototype folded patch antenna. In particular, it is shown that the passive wireless sensor can detect small strain changes lower than 20 με, and can perform well at a strain range higher than 10,000 με.

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