论文部分内容阅读
提出并研究了基于Michelson干涉仪的应用于检测时变扰动的光纤分布式传感器。所提出的光纤传感器由两个Michelson干涉仪和一个光纤延迟环组成。扰动作用在传感光纤上,引起传输光波相位的调制作用,可以通过该传感器进行检测并得到扰动的位置信息。通过光电探测器对干涉信号进行接收。对接收到的信号进行隔直,并通过求取峰峰值的方法对隔直后的信号进行预处理。通过希尔伯特变换、相位去包裹和三角函数运算可以提取出预处理信号中包含的相位信息。最后,通过频谱分析和相应的数学运算可以实现扰动的定位。在20 km的监测距离内通过实验验证了传感器的可行性。所提出的光纤传感器具有实时性好、抗偏振性、低成本的独特优势。
A fiber distributed sensor based on Michelson interferometer for detecting time-varying perturbations was proposed and studied. The proposed fiber optic sensor consists of two Michelson interferometers and a fiber delay ring. The perturbation acts on the sensing fiber, causing modulation of the transmitted light wave phase, which can be detected by the sensor and perturbed position information can be obtained. The interference signal is received by the photodetector. The received signal is cut off and the signal after the cutoff is pre-processed by finding the peak-to-peak value. Phase information contained in the preprocessed signal can be extracted by Hilbert transformation, phase unwrapping, and trigonometric functions. Finally, the location of disturbances can be achieved by spectrum analysis and corresponding mathematical operations. The feasibility of the sensor was verified experimentally with a monitoring distance of 20 km. The proposed optical fiber sensor with real-time, anti-polarization, low-cost unique advantages.