一种光纤传感器温度与应变同时解调的方法
A simultaneous temperature and strain demodulation method in optical fiber sensors
光纤传感器 布里渊散射 外差检测 温度与应变 微波电光调制 optical fiber sensor Brillouin scattering heterodyne detection temperature and strain microwave electro-optic modulation
摘要
文章分析了一种利用外差检测所得微波信号的电场振幅和频率来计算后向布里渊散射光功率及频移的方法。该方法通过对功率较强的微波信号进行数值拟合，利用得到的直流分量和交流分量计算出后向散射光功率、频移及其随温度、应变变化的系数矩阵。数值结果表明，温度、应变的解调精度分别为1℃、100 με，但也受到一定采样频率的限制。
Abstract
In this paper, a method is analyzed to calculate the backscattering optical power and frequency shift by using the electric field amplitude and frequency of the microwave signals obtained by heterodyne detection. By using this method, the fairly high power microwave signals are integrated by numerical fitting and the backscattering optical power, frequency shift and the coefficient matrix changed with the temperature and strain are calculated by using the resulted DC and AC components. The numerical results show that the demodulation precisions of the temperature and strain are 1℃ and 100 με respectively, yet restrained by certain sampling frequencies.
任中耀, 潘炜, 闫连山, 罗斌, 张志勇, 雷杨, 蒋志远. 一种光纤传感器温度与应变同时解调的方法[J]. 光通信研究, 2010, 36(2): 45. Ren Zhongyao, Pan Wei, Yan Lianshan, Luo Bin, Zhang Zhiyong, Lei Yang, Jiang Zhiyuan. A simultaneous temperature and strain demodulation method in optical fiber sensors[J]. Study On Optical Communications, 2010, 36(2): 45.
PDF全文
