摘要
将放大自发辐射(ASE)光源的线性区间作为边缘滤波器的解调技术予以推广,将其由温度、应变的静态解调扩展应用至光纤光栅振动传感器的动态解调.首先建立了基于ASE光源解调的光纤光栅振动传感测量系统,提出位移负阶跃响应测试法并利用其得到了该系统的时域信号,并且由非线性直接拟合法获得该系统的动态参数,所得动态参数与有限元仿真结果相近.研究结果表明:ASE光源进行动态解调方案简单可行,位移负阶跃响应测试法获得动态时域信号不需要专门的激励设备,易于实现,与传统求取动态参数的方法相比,非线性拟合法求取动态参数更为简便.
The demodulating technique of amplified spontaneous emission （ASE） is extenoeo to fiber Bragg gratings vibration acceleration sensor and so this technique for the static demodulation of temperature or strain can be applied to dynamical demodulation of vibration acceleration. The measure system of fiber Bragg gratings vibration acceleration sensor based on ASE is constructed. The dynamical time domain signal of this system is obtained by negative step response of setting initial displacement. The dynamic parameters by nonlinear direct fitting coincide well with ones from finite element method. The results demonstrate that the dynamical demodulation project of ASE is simple,this modeling method of negative step response does not need special excitation equipment, and the method of nonlinear direct fitting for getting the dynamical parameters is more conveniently than the traditional methods.
出处
《西安交通大学学报》
EI
CAS
CSCD
北大核心
2010年第4期43-47,共5页
Journal of Xi'an Jiaotong University
基金
国家"863计划"资助项目(2006AA06Z210
2007AA03Z413)
国家自然科学基金资助项目(60654001
60727004)
关键词
光纤光栅
振动加速度传感器
ASE光源
时域建模
负阶跃响应
非线性直接拟合法
fiber grating
vibration acceleration sensor amplified source
time domain modeling negative step response spontaneous emission light nonlinear direct fitting
