一种新型光纤Bragg光栅振动传感器的设计
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摘要
为满足各种工程结构和机械系统的低频测试需求,设计并研制了一种特殊三脚支架和等强度悬臂梁结构的可放大振动信号、增加灵敏度和有较宽工作频带的光纤Bragg光栅(FBG)振动传感器,建立了传感器的数学模型,测试了传感器固有频率、灵敏度、失真系数和横向抗干扰能力等参数。实验表明,研制的FBG振动传感器,其固有频率约为100 Hz,频带可达75 Hz,振幅分辨率为0.3 nm/mm,灵敏度为28.5 pm/m.s-2,用于检测75 Hz以下的振动是完全可行的。
A new fiber Bragg grating(FBG) vibration sensor with a special structure of metal three-legged stand and elastic cantilever is designed for many low-frequency tests in engineering structures and mechanical systems.It can work with a wide band,amplify vibrating signal and increase sensitivity.And the mathematical model of vibration sensor was established.Furthermore,natural frequency,sensitivity,distortion factor,and horizontal anti-jamming capability of the sensor were measured.Experimental results show that the vibration detection below 75 Hz is feasible with the FBG vibration sensor designed.Its natural frequency is about 100 Hz,frequency range is 75 Hz,the resolution of amplitude is 0.3 nm/mm,and sensitivity is 28.5 pm/m·s-2.
A new fiber Bragg grating(FBG) vibration sensor with a special structure of metal three-legged stand and elastic cantilever is designed for many low-frequency tests in engineering structures and mechanical systems.It can work with a wide band,amplify vibrating signal and increase sensitivity.And the mathematical model of vibration sensor was established.Furthermore,natural frequency,sensitivity,distortion factor,and horizontal anti-jamming capability of the sensor were measured.Experimental results show that the vibration detection below 75 Hz is feasible with the FBG vibration sensor designed.Its natural frequency is about 100 Hz,frequency range is 75 Hz,the resolution of amplitude is 0.3 nm/mm,and sensitivity is 28.5 pm/m·s-2.
引文
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[3]SONGJian-fei,SHAOLi-yang,ZHANG A-ping,et al.A newFBG based dynamic-strain interrogation system[J].Journal ofOptoelectronics.Laser,2007,18(8):924-926.宋剑飞,邵理阳,张阿平,等.一种新型FBG动态应变解调系统[J].光电子.激光,2007,18(8):924-926.
[4]WANG Yan,LIANG Da-kai,ZHOU Bing.Vibrationmonitor of op-tical fiber grating smart structure using intensity demodulationmethod[J].Journal of Optoelectronics.Laser,2008,19(3):361-364.王彦,梁大开,周兵.强度解调的光纤光栅智能结构动态监测技术[J].光电子.激光,2008,19(3):361-364.
[5]GONG Xian-feng,YI Hong-gang,ZHOU XIAO-min,et al.Lowfrequencyfiber Bragg grating acceleration sensors[J].Journalof University of Science and Technology Beijing,2006,28(1):75-77.巩宪锋,衣红钢,周晓敏,等.低频光纤光栅加速度传感器[J].北京科技大学学报,2006,28(1):75-77.
[6]SUN Ru-jiao,SUN Li-min,SUN Zhi,et al.Design Research ofFiber Bragg Grating Accelerometer[J].Acta photonica sinica,2007,36(1):63-67.孙汝蛟,孙利民,孙智,等.一种新型光纤布喇格光栅振动传感器研究[J].光子学报,2007,36(1):63-67.
[7]Akira Mita,Isamu Yokoi.Fiber bragg grating accelerometer forbuildings and civil infrastructures[C].SPIE[C].2001,4330:479-486.
[8]Alberto Cavallo,Chris May,Aldo Minardo,et al.Active vibra-tion control by a smart auxiliary mass damper equipped with afiber Bragg grating sensor[J].Sensors and Actuators A:Physi-cal.2009,153:180-186.
[9]GONG Xian-feng,YI Hong-gang,ZHOU Xiao-min,et al.Lowfre-quencyfiber Bragg grating acceleration sensors[J].Journal ofUniversity of Science and Technology Beijing,2006,28(1):75-77.巩宪锋,衣红钢,周晓敏,等.低频光纤光栅加速度传感器[J].北京科技大学学报,2006,28(1):75-77.
[10]QIAO Xue-guang,GE Peng,JIA Zhen-an,et al.Study on de-modulation technique for fiber grating vibration sensor[J].Journal of Optoelectronics.Laser,2009,20(8):1004-1007.乔学光,葛鹏,贾振安,等.光纤光栅振动传感解调技术的研究[J].光电子.激光,2009,20(8):1004-1007.
[11]MA Chao,QIAO Xue-guang,JIA Zhen-an,et al.Research andapplication of fiber Bragg grating geophone[J].Progress inGeophysics,2008,23(2):622-625.马超,乔学光,贾振安,等.光纤布拉格光栅地震检波器的研究与应用[J].地球物理学进展,2008,23(2):622-625.
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