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极大倾角光纤光栅悬臂梁振动传感器性能优化

Performance Optimization of Excessively Tilted Fiber Grating Cantilever Beam Vibration Sensor

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摘要

提出一种利用极大倾角光纤光栅(Ex-TFG)谐振峰的3 dB点进行悬臂梁低频振动检测的优化方法。对Ex-TFG的轴向应变和弯曲应变特性进行理论分析和实验验证;对基于光强调制的Ex-TFG振动传感的光谱响应特性进行理论分析,采用Ex-TFG谐振峰的3 dB点对振动进行实验研究。实验结果表明:1)Ex-TFG在轴向应变和弯曲应变条件下,其谐振波长均发生蓝移,横电(TE)模和横磁(TM)模的轴向应变灵敏度分别为-2.8 pm/με和-1.8 pm/με,透射强度基本不变,在0~0.4 m -1的曲率范围内基于光强变化的弯曲应变灵敏度分别为2.6 dB/m -1和1.2 dB/m -1,基于波长漂移的弯曲应变灵敏度分别为-3.34 nm/m -1和-2.53 nm/m -1;2)在低频振动的检测中,Ex-TFG的TE模和TM模的谐振峰3 dB点的振动加速度灵敏度分别为113.54 mV/g和100.93 mV/g,比谐振峰的峰值波长点(100%点)的振动加速度灵敏度高2倍多,且信噪比(SNR)高约10 dB。此外,SNR随悬臂梁厚度的增大而增大;3)在相同条件下,TE模具有比TM模更高的振动响应灵敏度,但TM模比TE模具有更好的输出稳定性。

Abstract

This study proposes an optimization method for detecting the low-frequency vibration of a cantilever beam using the 3 dB point of the resonant peak of an excessively tilted fiber grating (Ex-TFG). First, the axial and bending strain characteristics of Ex-TFG are theoretically analyzed and experimentally verified. The spectral response characteristics of the Ex-TFG vibration sensor modulated by light intensity are also theoretically analyzed. The 3 dB point of the Ex-TFG resonance peak is proposed to detect the vibration signal, and subsequently, a corresponding experimental research is conducted. The results are as follows. First, the resonance wavelength of Ex-TFG is blue shifted owing to both axial and bending strains. The axial strain sensitivities are -2.8 and -1.8 pm/με for the TE and TM modes, respectively, whereas the transmission intensity remains unchanged. Bending strain sensitivities based on the light intensity modulation in the curvature range of 0-0.4 m -1 are 2.6 dB/m -1 and 1.2 dB/m -1, respectively. Bending strain sensitivities based on wavelength shift are -3.34 nm/m -1 and -2.53 nm/m -1, respectively. Second, during vibration detection, the vibration acceleration sensitivities of the resonance peaks of Ex-TFG at the 3 dB points are 113.54 and 100.93 mV/g for the TE and TM modes, respectively, which are over two times higher than those (100% point) of the resonance peaks. The signal-to-noise ratios (SNRs) of the TE and TM modes at the 3 dB point are also higher (approximately 10 dB) than those (100% point) of the resonance peaks. In addition, the SNR increases with the increasing cantilever beam thickness. Third, under the same condition, the TE mode exhibits higher vibration response sensitivity than the TM mode; however, the output of the TM mode has better stability than the TE mode.

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中图分类号:TN253

DOI:10.3788/AOS201939.0806006

所属栏目:光纤光学与光通信

基金项目:国家自然科学基金(61875026,61505017)、重庆市科委前沿与基础项目(cstc2018jcyjAX0122,cstc2015jcyjA40035,cstc2015jcyjA40051)、重庆市教育委员会科学技术研究项目(KJQN201801121)、重庆理工大学创新基金(ycx2018231);

收稿日期:2019-03-19

修改稿日期:2019-05-05

网络出版日期:2019-08-01

作者单位    点击查看

罗彬彬:重庆理工大学光纤传感与光电检测重庆市重点实验室, 重庆 400054
谢浪:重庆理工大学光纤传感与光电检测重庆市重点实验室, 重庆 400054
王亚杰:重庆理工大学光纤传感与光电检测重庆市重点实验室, 重庆 400054
邹雪:重庆理工大学光纤传感与光电检测重庆市重点实验室, 重庆 400054
石胜辉:重庆理工大学光纤传感与光电检测重庆市重点实验室, 重庆 400054
叶露:重庆理工大学光纤传感与光电检测重庆市重点实验室, 重庆 400054
蒋上海:重庆理工大学光纤传感与光电检测重庆市重点实验室, 重庆 400054
赵明富:重庆理工大学光纤传感与光电检测重庆市重点实验室, 重庆 400054
汪治华:重庆理工大学光纤传感与光电检测重庆市重点实验室, 重庆 400054

联系人作者:罗彬彬(luobinbin@cqut.edu.cn); 石胜辉(shshill@cqut.edu.cn);

备注:国家自然科学基金(61875026,61505017)、重庆市科委前沿与基础项目(cstc2018jcyjAX0122,cstc2015jcyjA40035,cstc2015jcyjA40051)、重庆市教育委员会科学技术研究项目(KJQN201801121)、重庆理工大学创新基金(ycx2018231);

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引用该论文

Luo Binbin,Xie Lang,Wang Yajie,Zou Xue,Shi Shenghui,Ye Lu,Jiang Shanghai,Zhao Mingfu,Wang Zhihua. Performance Optimization of Excessively Tilted Fiber Grating Cantilever Beam Vibration Sensor[J]. Acta Optica Sinica, 2019, 39(8): 0806006

罗彬彬,谢浪,王亚杰,邹雪,石胜辉,叶露,蒋上海,赵明富,汪治华. 极大倾角光纤光栅悬臂梁振动传感器性能优化[J]. 光学学报, 2019, 39(8): 0806006

被引情况

【1】邓欧,罗彬彬,吴德操,谢浪,赵明富,邹雪,石胜辉,刘恩华,蒋上海. 反射型极大倾角光纤光栅悬臂梁振动传感特性. 光学学报, 2020, 40(20): 2006001--1

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