检测教育部重点实验室,西安,710065
网络首发:2010-04-10,
纸质出版:2010
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邵军 1, 2, 刘君华 1, 等. 放大自发辐射解调的光纤光栅振动传感系统时域建模研究[J]. 西安交通大学学报, 2010,44(4):43-47.
Time Domain Modeling of Fiber Bragg Gratings Vibration Acceleration Sensor Based on Amplified Spontaneous Emission Light Source[J]. 2010, 44(4): 43-47.
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 extended 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.
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