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Bragg Gratings in Polarization Maint...

Quintana, Joel.

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Bragg Gratings in Polarization Maintaining Optical Fiber as Three Dimensional Strain Sensor.

紀錄類型:	書目-電子資源 : Monograph/item
正題名/作者:	Bragg Gratings in Polarization Maintaining Optical Fiber as Three Dimensional Strain Sensor./
作者:	Quintana, Joel.
出版者:	Ann Arbor : ProQuest Dissertations & Theses, : 2017,
面頁冊數:	78 p.
附註:	Source: Dissertation Abstracts International, Volume: 78-11(E), Section: B.
Contained By:	Dissertation Abstracts International78-11B(E).
標題:	Electrical engineering. -
電子資源:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=10198439
ISBN:	9781369885095

Bragg Gratings in Polarization Maintaining Optical Fiber as Three Dimensional Strain Sensor.
Quintana, Joel.

Bragg Gratings in Polarization Maintaining Optical Fiber as Three Dimensional Strain Sensor. - Ann Arbor : ProQuest Dissertations & Theses, 2017 - 78 p.

Source: Dissertation Abstracts International, Volume: 78-11(E), Section: B.

Thesis (Ph.D.)--The University of Texas at El Paso, 2017.

Fiber-Bragg Gratings (FBG) for Structural Health Monitoring (SHM) have been studied extensively as they offer electrically passive operation, electromagnetic interference (EMI) immunity, high sensitivity and multiplexing as compared to conventional electric strain sensors. FBG sensors written within polarization maintaining (PM) optical fiber offer additional dimensions of strain measurement, greatly reducing the number of sensors needed to properly monitor a structure. This reduction however, adds complexity to the dis- crimination of the sensor's optical response to its corresponding applied strains. This dissertation defines the set of algorithms needed to measure planar strain using PM-FBGs exclusively. It defines the minimum number of sensors needed to reconstruct the full state of strain, epsilon and the maximum number of strain tensor components a single PM-FBG is capable of measuring. Two experiments were performed under the same test specifications; a single PM-FBG and 2 multiplexed PM-FBGs in a rosette pattern adhered to a test spec- imen subject to uniaxial tension. The far field strain was measured at the location of the sensor using only the optical response and PM-FBG axes orientation with respect to the specimen axes. Strains at the surface of the specimen were measured using Digital Image Correlation (DIC) analysis and an electronic extensometer. The PM-FBG measurements where then compared to the DIC/extensometer data for validation. The comparison of the strains epsilonxx, epsilon yy, and epsilonxy resulted in a high correlation, averaging .97 between the strain mea- surement techniques. The PM-FBG measured specimen surface strains with low percent error values (approximately 20%). PM-FBG sensitivity is greatly affected by the sensor's material properties and installation or embedding techniques. The algorithm for measuring a full state of planar strain at a point presented in this dissertation and is validated though experimental analysis. It can be applied to multiple or single PM-FBG systems with low error and high correlation to actual strains on the surface of a specimen. It is the first step in practical implementation of PM-FBGs for Structural Health Monitoring.

ISBN: 9781369885095Subjects--Topical Terms:

649834
Electrical engineering.

Bragg Gratings in Polarization Maintaining Optical Fiber as Three Dimensional Strain Sensor.
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