Study on radial pressure sensing characteristics of EVA sensitivity enhanced fiber grating

被引：0
|
作者：
Collegeof Information Science & Engineering, Yanshan University, Qinhuangdao [1 ]
Hebei
066004, China
不详 [2 ]
Hebei
066004, China
机构：
[1] Collegeof Information Science & Engineering, Yanshan University, Qinhuangdao, 066004, Hebei
[2] Key Laboratory for Special Fiber and Fiber Sensor of Hebei Province, Qinhuangdao, 066004, Hebei
来源：
Guangxue Xuebao | / 10卷
关键词：
Fiber grating; Fiber optics; Matching demodulation; Polymer encapsulation; Radial pressure;
D O I：
10.3788/AOS201535.1006001
中图分类号：
学科分类号：
摘要：
A novel fiber grating radial pressure sensitivity enhanced scheme, which is encapsulated with ethylenevinyl acetate copolymer (EVA), is presented. The fiber grating is encapsulated into a half dumbbell-shaped sensing unit with EVA material and square steel. And the structure stress distribution and radial pressure response characteristics of the sensor are calculated theoretically with finite element software. Finally, an experiment system is established for verifying the sensing characteristics of the sensitivity enhanced optic fiber grating radial pressure sensors. The experiment results show that when the radial pressure is ranged from 0 to 0.3 N, the encapsulated sensors have excellent linearity to radial pressure. And the sensitivity is 100.74 times higher than that of naked optical fiber grating. Further more, after demodulation with the matching method, the sensitivity of the system can be up to 0.94 nm/N. The research results have an important reference significance for solving the practical engineering requirements for accurate measurement of micro radial strain. © 2015, Chinese Optical Society. All right reserved.
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页数：9
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