Study on vibration sensing performance of an equal strength cantilever beam based on an excessively tilted fiber grating

作者：Luo, Binbin^*; Yang, Wanmeng; Hu, Xinyu; Lu, Huafeng; Shi, Shenghui; Zhao, Mingfu; Lu, Ye; Xie, Lang; Sun, Zhongyuan; Zhang, Lin

来源：Applied Optics, 2018, 57(9): 2128-2134.

DOI：10.1364/AO.57.002128

• BRAGG-GRATINGS
• OPTICAL-FIBER
• SENSITIVITY
• SENSORS

An equal strength cantilever beam vibration sensor based on an excessively tilted fiber grating (Ex-TFG) with light intensity demodulation is proposed. The basic principles and sensing characteristics of vibration sensing of an equal strength cantilever beam and Ex-TFG, the combination of which is applied into vibration sensing, are analyzed. An Ex-TFG is attached to the middle axis of an equal strength cantilever beam. As the vibration of a piezoelectric ceramic causes the equal strength cantilever beam to deform, the same and uniform deformation also occurs on the Ex-TFG. Experimental results show that when the thickness of the equal strength cantilever beam is 0.3 mm and the Ex-TFG is at transverse electric (TE) polarization state, the sensing performance is the best, with the maximum acceleration sensitivity reaching 81.065 mv center dot m(-1) center dot s(2), and the fast Fourier transform (FFT) main frequency components of the sensing signal accounting for more than 80%. In addition, this sensor is stable in sensing performance, easy in demodulation, simple in structure, high in sensitivity, and easy in manufacture, applicable for the sensing and on-line monitoring of low-frequency vibration signals.

• 出版日期2018-3-20
• 单位重庆理工大学