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提出了一种基于混沌光纤激光器的准分布式布拉格光纤光栅传感系统,将波长可调谐的混沌光纤激光器作为传感光源,全同弱反射布拉格光纤光栅作为传感元件。利用混沌光源具有delta函数的自相关特性,将混沌源的参考光信号与从全同弱反射布拉格光纤光栅反射的光信号经光电探测器进行光电转换,结合相关法对参考光和反射光进行相关运算,根据相关峰的位置对传感器位置进行精确定位。利用混沌激光的可调谐性实现因应力作用而发生变化的全同弱反射光纤光栅的中心波长的解调,从而实现准分布式的传感网络。实验结果表明利用混沌激光可在单路光纤上复用全同弱反射光纤光栅实现传感,并有望实现密集型全同弱反射光纤光栅传感网络。
A quasi-distributed fiber Bragg grating sensing system based on chaotic fiber laser is proposed. The wavelength-tunable chaos fiber laser is used as the sensing light source, and the same weakly reflected fiber Bragg grating is used as the sensing element. Based on the autocorrelation property of chaotic light source with delta function, the reference optical signal of chaotic source and the optical signal reflected from the same total reflection Bragg fiber grating are photoelectrically converted by photodetector, and the correlative method is used to correlate reference light and reflected light Operation, according to the location of the peak position of the sensor for precise positioning. The tunability of the chaotic laser is used to realize the central wavelength demodulation of the full - faint FBG grating which is changed by the stress, so as to realize the quasi - distributed sensing network. The experimental results show that the chaotic laser can be used to realize the sensing of single-mode fiber with the same weakly-reflected FBG and is expected to realize dense full-weak-FBG sensing network.