Large dynamic strain distributed Brillouin optical time domain reflectometer based on single-mode fiber

The invention discloses a large dynamic strain distributed Brillouin optical time domain reflectometer based on a single mode fiber. The large dynamic strain distributed Brillouin optical time domain reflectometer comprises a narrow linewidth laser, a light amplification unit, a frequency shift unit, a pulse modulation unit, a first filtering unit, a second filtering unit, a photoelectric detector, a third filtering unit and an electric signal modulation unit which are connected in sequence. The sensing system has the advantage that large-range dynamic strain monitoring can be realized with low cost. The optical time domain reflectometer is low in cost, simple in structure and capable of achieving large-range dynamic strain measurement. 本发明公开了一种基于单模光纤大动态应变分布式布里渊光时域反射仪，包括顺序连接的窄线宽激光器、光放大单元、移频单元，脉冲调制单元、第一滤波单元、第二滤波单元、光电探测器、第三滤波单元、电信号调制单元。这种传感系统的优点是能够低成本的实现大范围动态应变监测。这种光时域反射仪低成本、结构简单、能实现大范围动态应变测量。