Experimental investigation on encapsulation of whispering gallery mode sensors for smart materials applications

Nguyen Quang Nguyen, Nikhil Gupta

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

Structural health monitoring applications of composite materials can benefit from various micro-sized optical sensors. Whispering Gallery Mode (WGM) optical sensors are well known for ultra-high sensitivity in force and displacement measurement. Their sensing principle is based on optical coupling between evanescent fields of an optical fiber with a microsphere resonator. Any stimulus causing a change in the radius or the index of refraction of the microsphere can be sensed by a shift in transmission spectrum. Present WGM sensors utilize two separate systems to hold fiber and particle in the optically favorable configuration to obtain WGM resonances. However, use in structural health monitoring of materials requires that these sensors are encapsulated in a solid material system, which is a complex task. Therefore, most of the present studies on WGM sensors conduct measurements in fluidic media such as air or water. The present work explores the possibility of encapsulating WGM sensors as a system inside a solid material so that they can be used as standalone sensors without the requirement of a holding mechanism for the particle. In such a configuration they can be embedded inside composite materials and used for health monitoring applications. The present work demonstrates success in encapsulating the sensor in a solid medium and also presents analysis about the sensitivity of such sensor configurations. The results are useful in developing sensing schemes for composite materials using WGM sensors.

Original languageEnglish (US)
Title of host publication24th Annual Technical Conference of the American Society for Composites 2009 and 1st Joint Canadian-American Technical Conference on Composites
Pages1106-1117
Number of pages12
StatePublished - Dec 1 2009
Event24th Annual Technical Conference of the American Society for Composites 2009 and 1st Joint Canadian-American Technical Conference on Composites - Newark, DE, United States
Duration: Sep 15 2009Sep 17 2009

Publication series

Name24th Annual Technical Conference of the American Society for Composites 2009 and 1st Joint Canadian-American Technical Conference on Composites
Volume2

Other

Other24th Annual Technical Conference of the American Society for Composites 2009 and 1st Joint Canadian-American Technical Conference on Composites
CountryUnited States
CityNewark, DE
Period9/15/099/17/09

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ASJC Scopus subject areas

  • Ceramics and Composites

Cite this

Nguyen, N. Q., & Gupta, N. (2009). Experimental investigation on encapsulation of whispering gallery mode sensors for smart materials applications. In 24th Annual Technical Conference of the American Society for Composites 2009 and 1st Joint Canadian-American Technical Conference on Composites (pp. 1106-1117). (24th Annual Technical Conference of the American Society for Composites 2009 and 1st Joint Canadian-American Technical Conference on Composites; Vol. 2).