scholarly journals Bidirectional, Bimodal Ultrasonic Lamb Wave Sensing in a Composite Plate Using a Polarization-Maintaining Fiber Bragg Grating

Sensors ◽  
2019 ◽  
Vol 19 (6) ◽  
pp. 1375 ◽  
Author(s):  
Chunfang Rao ◽  
Lingze Duan
Keyword(s):  
Wave Propagation ◽  
Fiber Bragg Grating ◽  
Lamb Wave ◽  
Propagation Direction ◽  
Bragg Grating ◽  
Wave Propagation Direction ◽  
Slow Axis ◽  
Polarization Maintaining Fiber ◽  
Polarization Maintaining ◽  
Mode Response

Lamb wave (LW) is well suited for structural health monitoring (SHM) in advanced composites. However, characteristic differences between the symmetric modes and the anti-symmetric modes often add complexity to SHM systems. The anisotropic nature of composite materials, on the other hand, necessitates direction-sensitive sensing. In this paper we report the experimental demonstration of bidirectional (0° and 90°), bimodal (S0 and A0) LW measurement within the frequency range of 20–140 kHz using a polarization-maintaining fiber Bragg grating (PM-FBG) sensor attached to a composite laminated plate. By selectively interrogating the fast and/or the slow axis of the PM-FBG, we show that not only can the sensor respond to LWs propagating along both directions, but the response can also be used to differentiate the two directions. Moreover, the fast axis of the sensor is able to respond to both the S0 and the A0 modes when the sensor is aligned with the wave propagation direction, whereas single S0 mode response can be achieved with the slow axis operating perpendicularly to the wave propagation direction. Such diverse responses indicate the potential of PM-FBGs as versatile multi-parameter SHM detectors, which can effectively address the challenges posed by material anisotropicity and LW mode diversity.

SIMULTANEOUS MEASUREMENT OF STRAIN AND TEMPERATURE WITH POLARIZATION MAINTAINING FIBER BRAGG GRATING LOOP MIRROR

2014 ◽  
Vol 42 (3) ◽  
pp. 298-307 ◽  
Author(s):  
Qi Wang ◽  
Ji Xia ◽  
Yong Zhao ◽  
Xu Liu ◽  
Peng Wang ◽  
...  
Keyword(s):  
Fiber Bragg Grating ◽  
Simultaneous Measurement ◽  
Bragg Grating ◽  
Polarization Maintaining Fiber ◽  
Polarization Maintaining ◽  
Loop Mirror

Four-Wave Mixing in a Polarization-maintaining Fiber Bragg Grating

2015 ◽  
pp. 1-1
Author(s):  
Xunli Yin ◽  
Xuemei Cheng ◽  
Kun Fei ◽  
Jintao Bai ◽  
Zhaoyu Ren
Keyword(s):  
Fiber Bragg Grating ◽  
Four Wave Mixing ◽  
Bragg Grating ◽  
Wave Mixing ◽  
Polarization Maintaining Fiber ◽  
Polarization Maintaining

Controllable Birefringent Polarization-Maintaining Fiber Bragg Grating with High Precision

2010 ◽  
Vol 37 (4) ◽  
pp. 1028-1032
Author(s):  
裴丽 Pei Li ◽  
赵瑞峰 Zhao Ruifeng ◽  
宁提纲 Ning Tigang ◽  
祁春慧 Qi Chunhui ◽  
李卓轩 Li Zhuoxuan ◽  
...  
Keyword(s):  
Fiber Bragg Grating ◽  
High Precision ◽  
Bragg Grating ◽  
Polarization Maintaining Fiber ◽  
Polarization Maintaining

Strain and temperature discrimination using a fiber Bragg grating concatenated with PANDA polarization-maintaining fiber in a fiber loop mirror

Optik ◽  
2020 ◽  
Vol 221 ◽  
pp. 165352
Author(s):  
ZhiChao Ding ◽  
ZhongWei Tan ◽  
YunShu Gao ◽  
Yue Wu ◽  
Bin Yin
Keyword(s):  
Fiber Bragg Grating ◽  
Bragg Grating ◽  
Polarization Maintaining Fiber ◽  
Polarization Maintaining ◽  
Fiber Loop Mirror ◽  
Loop Mirror ◽  
Fiber Loop

scholarly journals Switchable UWB pulse generation using a polarization maintaining fiber Bragg grating as frequency discriminator

2010 ◽  
Vol 18 (4) ◽  
pp. 3643 ◽  
Author(s):  
Xinhuan Feng ◽  
Zhaohui Li ◽  
Bai-Ou Guan ◽  
C. Lu ◽  
H. Y. Tam ◽  
...  
Keyword(s):  
Fiber Bragg Grating ◽  
Pulse Generation ◽  
Bragg Grating ◽  
Frequency Discriminator ◽  
Polarization Maintaining Fiber ◽  
Polarization Maintaining

scholarly journals Lamb Wave Directional Sensing with Piezoelectric Fiber Rosette in Structure Health Monitoring

2019 ◽  
Vol 2019 ◽  
pp. 1-12
Author(s):  
Songlai Wang ◽  
Wanrong Wu ◽  
Yiping Shen ◽  
Hui Li ◽  
Binlong Tang
Keyword(s):  
Wave Propagation ◽  
Health Monitoring ◽  
Lamb Wave ◽  
Estimation Method ◽  
Propagation Direction ◽  
Response Amplitude ◽  
Piezoelectric Sensors ◽  
Wave Propagation Direction ◽  
Lamb Wave Propagation ◽  
Piezoelectric Fiber

Directional piezoelectric sensors can detect the Lamb wave propagation direction to locate damage in structural health monitoring (SHM). The directivity of the round piezoelectric fiber is exploited with a 0°/45°/90° rosette configuration to acquire flexural Lamb wave signals. The directional response of the piezoelectric fiber under narrowband tone-burst excitation is theoretically deduced. Experimental tests are conducted to demonstrate the directivity and the frequency response property of the piezoelectric fiber under different excitation central frequencies in comparison with the MFC, rectangular piezoelectric sheet, and circular piezoelectric disc. Continuous wavelet transform (CWT) is applied to extract the maximum response amplitude information of the acquired Lamb wave signal at a central frequency. Experimental test results indicate that the piezoelectric fiber is capable to be used as a Lamb wave directional sensor than other piezoelectric sensors. A numerical estimation method for the Lamb wave propagation direction is proposed by defining an error function between the theoretical and experimental normalized response amplitude. The proposed method is generally applicable for different rosette configurations. Experimental results validate the accuracy of the proposed estimation method. The research results are significant to design or select the piezoelectric sensor to measure Lamb wave signals.

Simultaneous demodulation of polarization mode coupling and fiber Bragg grating within a polarization maintaining fiber

2015 ◽  
Author(s):  
Yanshuang Zhao ◽  
Yanlei Liu ◽  
Jianzhong Zhang ◽  
Jun Yang ◽  
John Canning ◽  
...  
Keyword(s):  
Fiber Bragg Grating ◽  
Mode Coupling ◽  
Bragg Grating ◽  
Polarization Mode ◽  
Polarization Maintaining Fiber ◽  
Polarization Maintaining
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