東華大學圖書館 |

語系: 繁體中文

說明(常見問題)

回圖書館首頁

手機版館藏查詢

登入

回首頁

切換: 標籤 | MARC模式 | ISBD

FindBook

Google Book

Amazon

博客來

Fringing Electric Field Sensors for the Detection of Incipient Thermal Damage in Composite Materials.

紀錄類型:	書目-電子資源 : Monograph/item
正題名/作者:	Fringing Electric Field Sensors for the Detection of Incipient Thermal Damage in Composite Materials./
作者:	Thomas, Jeffrey.
出版者:	Ann Arbor : ProQuest Dissertations & Theses, : 2021,
面頁冊數:	64 p.
附註:	Source: Masters Abstracts International, Volume: 83-02.
Contained By:	Masters Abstracts International83-02.
標題:	Electrical engineering. -
電子資源:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=28540711
ISBN:	9798535502861

Fringing Electric Field Sensors for the Detection of Incipient Thermal Damage in Composite Materials.
Thomas, Jeffrey.

Fringing Electric Field Sensors for the Detection of Incipient Thermal Damage in Composite Materials. - Ann Arbor : ProQuest Dissertations & Theses, 2021 - 64 p.

Source: Masters Abstracts International, Volume: 83-02.

Thesis (Master's)--University of Washington, 2021.

This item must not be sold to any third party vendors.

Commercial and military aviation has rapidly adopted the use of carbon composites due to their structural strength and light weight in comparison to metal alloys. As with metal aircraft, composite aircraft require regular inspection to maintain flight worthiness and safety for passengers and crew, however, thermal damage in composites is not detectable using conventional non-destructive evaluation (NDE) methods until after the material loses as much as 50% of its mechanical strength. Additionally, many NDE methods are expensive or severely limited by depth, resolution, or access to both sides of the material under Test (MUT). Dielectric spectroscopy combined with electric field sensors presents the possibility of a more effective means of identifying thermal damage in composite materials and enhance existing composite NDE methods. The goal of this thesis is to evaluate the effectiveness of detecting non-visible incipient thermal damage in composites using Fringing Electric Field (FEF) sensors and dielectric spectroscopy. We designed and implemented two sensors developed using established parameters for electric field sensors and analyzed sensor response using custom algorithms developed in MATLAB. Six aerospace composite samples, one undamaged and five exposed to temperatures ranging from 450°F to 626°F, were used to characterize the sensor response. An additional five composite samples with unknown thermal damage were measured for blind identification and validation. Spectroscopic FEF sensor measurements demonstrated thermal correlation above 70 kHz in calibrated gain sensor response with a low resolution of 0.03 dBV across all samples. Intra-sample overlap in sensor gain response resulted in the successful identification of only three of the five blind composite samples. Variation in sample measurements is attributed to the limited thermal resolution of the sensor and a standard deviation of individual sample measurements exceeding 8 percent due to sample geometry and physical damage. This thesis demonstrates a partial correlation between thermal damage in aerospace composites and their dielectric response via electric field sensor measurements above 70 kHz. With additional development, dielectroscopy with FEF sensors presents the potential to supplement and improve upon existing aerospace composite NDE technologies.

ISBN: 9798535502861Subjects--Topical Terms:

649834
Electrical engineering.
Subjects--Index Terms:

Aerospace

Fringing Electric Field Sensors for the Detection of Incipient Thermal Damage in Composite Materials.
LDR:03508nmm a2200361 4500 001 2343217
005 20220502104203.5
008 241004s2021 ||||||||||||||||| ||eng d
020 $a 9798535502861
035 $a (MiAaPQ)AAI28540711
035 $a AAI28540711
040 $a MiAaPQ $c MiAaPQ
100 1 $a Thomas, Jeffrey. $3 3681705
245 1 0 $a Fringing Electric Field Sensors for the Detection of Incipient Thermal Damage in Composite Materials.
260 1 $a Ann Arbor : $b ProQuest Dissertations & Theses, $c 2021
300 $a 64 p.
500 $a Source: Masters Abstracts International, Volume: 83-02.
500 $a Advisor: Mamishev, Alexander V.
502 $a Thesis (Master's)--University of Washington, 2021.
506 $a This item must not be sold to any third party vendors.
520 $a Commercial and military aviation has rapidly adopted the use of carbon composites due to their structural strength and light weight in comparison to metal alloys. As with metal aircraft, composite aircraft require regular inspection to maintain flight worthiness and safety for passengers and crew, however, thermal damage in composites is not detectable using conventional non-destructive evaluation (NDE) methods until after the material loses as much as 50% of its mechanical strength. Additionally, many NDE methods are expensive or severely limited by depth, resolution, or access to both sides of the material under Test (MUT). Dielectric spectroscopy combined with electric field sensors presents the possibility of a more effective means of identifying thermal damage in composite materials and enhance existing composite NDE methods. The goal of this thesis is to evaluate the effectiveness of detecting non-visible incipient thermal damage in composites using Fringing Electric Field (FEF) sensors and dielectric spectroscopy. We designed and implemented two sensors developed using established parameters for electric field sensors and analyzed sensor response using custom algorithms developed in MATLAB. Six aerospace composite samples, one undamaged and five exposed to temperatures ranging from 450°F to 626°F, were used to characterize the sensor response. An additional five composite samples with unknown thermal damage were measured for blind identification and validation. Spectroscopic FEF sensor measurements demonstrated thermal correlation above 70 kHz in calibrated gain sensor response with a low resolution of 0.03 dBV across all samples. Intra-sample overlap in sensor gain response resulted in the successful identification of only three of the five blind composite samples. Variation in sample measurements is attributed to the limited thermal resolution of the sensor and a standard deviation of individual sample measurements exceeding 8 percent due to sample geometry and physical damage. This thesis demonstrates a partial correlation between thermal damage in aerospace composites and their dielectric response via electric field sensor measurements above 70 kHz. With additional development, dielectroscopy with FEF sensors presents the potential to supplement and improve upon existing aerospace composite NDE technologies.
590 $a School code: 0250.
650 4 $a Electrical engineering. $3 649834
650 4 $a Aerospace engineering. $3 1002622
650 4 $a Mechanical engineering. $3 649730
650 4 $a Receivers & amplifiers. $3 3559205
650 4 $a Dielectric properties. $3 3560265
650 4 $a Standard deviation. $3 3560390
650 4 $a Accuracy. $3 3559958
650 4 $a Humidity. $3 3559498
650 4 $a Manufacturing. $3 3389707
650 4 $a Investigations. $3 3561159
650 4 $a Electrodes. $3 629151
650 4 $a Identification. $3 827285
650 4 $a Calibration. $3 2068745
650 4 $a Signal processing. $3 533904
650 4 $a Aviation. $3 873136
650 4 $a Data processing. $3 680224
650 4 $a Heat. $3 573595
650 4 $a Electronics. $3 517156
650 4 $a Composite materials. $3 654082
650 4 $a Military aircraft. $3 3681706
650 4 $a Spectrum analysis. $3 520440
650 4 $a Signal to noise ratio. $3 3681178
650 4 $a Electric fields. $3 880423
650 4 $a Sensors. $3 3549539
650 4 $a Algorithms. $3 536374
650 4 $a Geometry. $3 517251
653 $a Aerospace
653 $a Composite
653 $a Dielectric spectroscopy
653 $a Non-destructive evaluation
690 $a 0544
690 $a 0548
690 $a 0538
710 2 $a University of Washington. $b Electrical and Computer Engineering. $3 3437797
773 0 $t Masters Abstracts International $g 83-02.
790 $a 0250
791 $a Master's
792 $a 2021
793 $a English
856 4 0 $u http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=28540711