摘要
提出了一种测量布里渊频移的全新简便方案。从2根传感光纤反射回来的光经光电探测器外差接收,通过分析传感信号和参考信号的相对关系进行布里渊频移的测量。通过理论分析和实验结果可以看出:双光纤的引入省略了光的移频调制环节,简化了光路和滤波,降低了对光源的稳频要求,提高了系统的信噪比,增强了系统在实际应用中的可行性。
A novel scheme to measure the Brillouin frequency shift is proposed. Brillouin frequency shift signal is obtained by analyzing the relative relationship of sensing signal and reference signal. Theoretical analysis and experiment show ordinary coherent self-heterodyne scheme is simplified by using double sensing fibers; light modulation became unnecessary;demand of frequency stabilization is reduced; the SNR is improved in this system. This scheme is more feasible in practice.
出处
《传感器与微系统》
CSCD
北大核心
2006年第7期18-20,23,共4页
Transducer and Microsystem Technologies
基金
江西省测试技术与控制工程研究中心基金资助项目(ZX200304002)
关键词
分布式光纤传感
外差检测
布里渊散射
distributed fiber sensing
heterodyne detection
Brillouin scattering
