基于光频域反射技术的光纤传感网络性能分析方法

Performance analysis method of optical fiber sensor network based on optical frequency domain reflection technology

现有方法无法实现温度与应变的精准检测,为了提升光纤传感网络的传感性能,扩展光纤传感网络应用范围,设计了基于光频域反射技术的光纤传感网络性能分析。可调谐激光器将扫描激光传送至耦合器中,耦合器分散激光后分别传送至反射镜以及光纤光栅阵列中,激光传送至光纤光栅阵列后利用耦合器生成主干涉仪,主干涉仪将光传送至光电探测器中形成拍频信号;传送至反射镜的激光由马赫-曾德尔干涉仪接收后形成辅助反射仪,辅助反射仪将光传送至光电探测器形成另一个拍频信号。通过两个拍频信号间的差异完成光纤传感网络复用;依据两个拍频信号频率呈现光纤光栅位置信息,实现光纤传感网络的光栅位置信息解调,通过复用与光栅位置信息解调完成光纤传感网络的传感。实验结果表明,本方法线性拟合度的结果高达0.998 6,光纤传感网络可实现温度与应变的精准检测,应用性能广泛。

The existing methods can not achieve accurate detection of temperature and strain. In order to improve the sensing performance of the optical fiber sensor network, expand the application range of the optical fiber sensor network, and a performance analysis of optical fiber sensor network based on optical frequency domain reflection technology is designed. The tunable laser transmits the scanning laser light to the coupler. The coupler disperses the laser light and transmits it to the mirror and the fiber grating array respectively. After the laser light is transmitted to the fiber grating array, the coupler generates the main interferometer, and the main interferometer transmits the light to The beat signal is formed in the photodetector;the laser transmitted to the mirror is received by the Mach-Zehnder interferometer to form an auxiliary reflector, and the auxiliary reflector transmits the light to the photodetector to form another beat signal. The optical fiber sensor network multiplexing is completed by the difference between the two beat frequency signals;the position information of the optical fiber grating is presented according to the frequency of the two beat frequency signals, and the raster position information demodulation of the optical fiber sensor network is realized. Tune to complete the sensing of the optical fiber sensing network. The experimental results show that the linear fit of this method is as high as 0. 998 6. The optical fiber sensor network can realize the accurate detection of temperature and strain,and has a wide range of application performance.